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Still Images >> Tags for TIFF, DNG, and Related Specifications

Introduction
The flexible and extensible TIFF format has provided long service for digital imaging. TIFF files declare and describe their content by means of tags in the header and in Image File Directories (IFDs) within the file. Tags can indicate the basic geometry of the image, define how the image data is arranged, and indicate such facts as whether one or another image compression option has been used. TIFF tags defined by the 1992 TIFF 6.0 specification fall in the first two source categories listed below: baseline and extended. The specification also established procedures for further extension, and this has led to the establishment of tags in the two additional categories: private and private IFD. Some of the private and private IFD tags have been codified in additional specifications: TIFF/EP (ISO 12234-2, 2001), TIFF/IT (ISO 12639, 2004), DNG, and EXIF_2_2, discussed in the private IFD section below. Although the format description for DNG at this Web site (at the time of writing) describes version 1.1 (DNG_1_1; published by Adobe in 2005), the tag list below includes new tags added in DNG versions 1.2, 1.3, and 1.4 (2012).

Although not a true TIFF implementation, Windows Media Photo/HD Photo (WMP_1_0; now standardized as JPEG XR, ISO/IEC 29199-2:2012) employs a container format that borrows heavily from TIFF and adds a few new tags of interest, further extending the tag set in at least an informal sense. There are other proprietary or industry specifications that continue to extend TIFF, e.g., GeoTIFF_1_0, HylaFAX, and the Molecular Dynamics GEL format, and some of these tags have been folded into the table and identified in the short definitions or notes.

The TIFF specification requires that tags be encoded in numerical order and that is the sequence used in the table below. The GPS and interoperability tags appear to employ separate numerical series and they have been omitted from the table; comments welcome. The fifth column in the table indicates the source for each tag, and these sources are described below. The table and the data it contains owe a great debt to the AWare Systems Web site. Many references in these tables are linked to additional information provided at the AWare site. Interested persons may also wish to consult Ross Finlayson's TIFF Web page.


Sources for tag specifications

TIFF Baseline. The baseline set of tags were documented in TIFF 5.0 and carried over on pages 11-47 of the 1992 TIFF 6.0 specification.

TIFF Extended. The extended set includes some additional tags and added values for existing tags, as documented on pages 48-115 of the TIFF 6.0 specification.

TIFF Private. Originally, the term private meant just that. The TIFF 6.0 specification (page 8) states, "An organization might wish to store information meaningful to only that organization . . . . Tags numbered 32768 or higher, sometimes called private tags, are reserved for that purpose. Upon request, the TIFF administrator . . . will allocate and register one or more private tags for an organization . . . . You do not need to tell the TIFF administrator what you plan to use them for, but giving us this information may help other developers to avoid some duplication of effort." Over time, however, many private tags have become well established and well documented, e.g., tag 34675 for the ICC profile, dubbed InterColorProfile in the TIFF/EP standard. Thus, many members of the private tag class can be viewed as open extensions rather than as containers for secret information.

TIFF/EP, TIFF/IT, and DNG. A number of tags, some of which may once have been "private," have been defined in TIFF/EP (ISO 12234-2, 2001), TIFF/IT (ISO 12639, 2004), and DNG_1_1, an Adobe-sponsored extension of the TIFF 6.0 specification. As noted above, although this Web site's most recent description for DNG is version 1.1 (specfication published 2005), this tag list includes new tags added in versions 1.2, 1.3, and 1.4.

TIFF Private IFD The TIFF 6.0 specification (page 9) states, "If you need more than 10 tags, we suggest that you reserve a single private tag, define it as a LONG TIFF data type, and use its value as a pointer (offset) to a private IFD [image file directory] or other data structure of your choosing. Within that IFD, you can use whatever tags you want, since no one else will know that it is an IFD unless you tell them." As with private tags, we can understand private IFDs as an extension to TIFF, often very public and well documented.

The private IFD tags of greatest interest to the Library of Congress are those associated with the EXIF_2_2 specification, pertaining to image generation by digital still cameras. Exif is an abbreviation for EXchangeable Image File format, although Exif does not relate to TIFF as, say, JFIF relates to JPEG_DCT. The Exif IFD is pointed to by the Private Exif IFD tag 34665. This and other Exif tags are listed in the numerical table below.

For links to Exif specifications and other related information, see EXIF_2_2. The Exif standard established three private IFDs, and tags from the main Exif IFD are included in the list below. Tags for the other two Exif IFDs are listed at the Aware Web site: GPS IFD, for positioning information, and Interoperability IFD, used to encode compability information. With numerical sequences of their own, the GPS and Interoperability tags are not included in the table below. A third-party listing of all Exif tags is available from Exiv2.

HD Photo tags. Although not a true TIFF implementation, Windows Media Photo/HD Photo (WMP_1_0; now standardized as JPEG XR, ISO/IEC 29199-2:2012) employs a container format that borrows from TIFF and adds a few new tags of interest, further extending the tag set in at least an informal sense.



Tags in Numerical Order
CodeNameShort descriptionSource of tagNote
DecHex
25400FENewSubfileTypeA general indication of the kind of data contained in this subfile.BaselineReq'd in LC RFP97-6 Section C.4.7.

Usage rule in JHOVE TIFF module.

Mandatory for TIFF/EP.
25500FFSubfileTypeA general indication of the kind of data contained in this subfile.Baseline 
2560100ImageWidthThe number of columns in the image, i.e., the number of pixels per row.Baseline Listed in LoC Baseline Tags.

Req'd in LC RFP97-6 Section C.4.7. Provide actual pixel count.

Req'd in LC NDNP TIFF profile. See Appendix B. Image width in pixels.

Mandatory for TIFF 6.0 classes B, G, P, R, and Y.1

Mandatory for TIFF/EP.

For Exif, mandatory in primary TIFF IFD.
2570101ImageLengthThe number of rows of pixels in the image.BaselineListed in LoC Baseline Tags.

Req'd in LC RFP97-6 Section C.4.7. Provide actual pixel count.

Req'd in LC NDNP TIFF profile. Image length in pixels.

Mandatory for TIFF 6.0 classes B, G, P, R, and Y.1

Mandatory for TIFF/EP.

For Exif, mandatory in primary TIFF IFD.
2580102BitsPerSampleNumber of bits per component.Baseline

Listed in LoC Baseline Tags.

Req'd in LC RFP97-6 Section C.4.7.

Mandatory for TIFF 6.0 classes G, P, R, and Y.1

Mandatory for TIFF/EP.

For Exif, mandatory in primary TIFF IFD.

Required by DLF benchmark guidelines

2590103CompressionCompression scheme used on the image data.BaselineListed in LoC Baseline Tags. Sample values: 1=uncompressed and 4=CCITT Group 4.

Req'd in LC RFP97-6 Section C.4.7.

Mandatory for TIFF 6.0 classes B, G, P, R, and Y.1

Mandatory for TIFF/EP.

For Exif, mandatory in primary TIFF IFD.

Required by DLF benchmark guidelines
2620106PhotometricInterpretationThe color space of the image data.Baseline Listed in LoC Baseline Tags. Sample values: 1=black is zero and 2=RGB. Document also states "RGB is assumed to be sRGB; if RGB, an ICC profile should be present in the 34675 tag."

Req'd in LC RFP97-6 Section C.4.7

Mandatory for TIFF 6.0 classes B, G, P, R, and Y.1

Mandatory for TIFF/EP.

Mandatory for GeoTIFF_1_0.

For Exif, mandatory in primary TIFF IFD.

Required by DLF benchmark guidelines
2630107ThreshholdingFor black and white TIFF files that represent shades of gray, the technique used to convert from gray to black and white pixels.BaselineUsage rule in JHOVE TIFF module.
2640108CellWidthThe width of the dithering or halftoning matrix used to create a dithered or halftoned bilevel file.Baseline 
2650109CellLengthThe length of the dithering or halftoning matrix used to create a dithered or halftoned bilevel file.BaselineUsage rule in JHOVE TIFF module.
266010AFillOrderThe logical order of bits within a byte.Baseline 
269010DDocumentNameThe name of the document from which this image was scanned.Extended Listed in LoC Baseline Tags.

Req'd in LC RFP97-6 Section C.4.7. Provide collection identifier and filename.

Req'd in LC NDNP TIFF profile. Provide microfilm reel number or normalized LCCN.

Also used by HD Photo.
270010EImageDescriptionA string that describes the subject of the image.Baseline Also used by HD Photo
271010FMakeThe scanner manufacturer.Baseline Listed in LoC Baseline Tags.

Req'd in LC NDNP TIFF profile.

Also used by HD Photo.

Mandatory for TIFF/EP.
2720110ModelThe scanner model name or number.Baseline Listed in LoC Baseline Tags.

Req'd in LC NDNP TIFF profile. Provide "model name, model number, serial number."

Also used by HD Photo.

Mandatory for TIFF/EP.
2730111StripOffsetsFor each strip, the byte offset of that strip.BaselineListed in LoC Baseline Tags.

Req'd in LC RFP97-6 Section C.4.7

Mandatory for TIFF 6.0 classes B, G, P, R, and Y.1 (Files outside of these classes may use tiles and tags 322, 323, 324, and 325; Comments welcome.)

Mandatory in TIFF/EP for stripped images.

For Exif, mandatory in primary TIFF IFD.
2740112OrientationThe orientation of the image with respect to the rows and columns.Baseline Req'd in LC NDNP TIFF profile.

Mandatory for TIFF/EP.
2770115SamplesPerPixelThe number of components per pixel.BaselineListed in LoC Baseline Tags. Sample values: 8 8 8.

Req'd in LC RFP97-6 Section C.4.7.

Req'd in LC NDNP TIFF profile.

Mandatory for TIFF 6.0 classes R and Y.1

For Exif, mandatory in primary TIFF IFD.


Required by DLF benchmark guidelines
2780116RowsPerStripThe number of rows per strip.BaselineListed in LoC Baseline Tags.

Req'd in LC RFP97-6 Section C.4.7.

Mandatory for TIFF 6.0 classes B, G, P, R, and Y.1 (Files outside of these classes may use tiles and tags 322, 323, 324, and 325; Comments welcome.)

Mandatory in TIFF/EP for stripped images.

For Exif, mandatory in primary TIFF IFD.
2790117StripByteCountsFor each strip, the number of bytes in the strip after compression.BaselineListed in LoC Baseline Tags.

Req'd in LC RFP97-6 Section C.4.7

Mandatory for TIFF 6.0 classes B, G, P, R, and Y.1 (Files outside of these classes may use tiles and tags 322, 323, 324, and 325; Comments welcome.)

Mandatory in TIFF/EP for stripped images.

For Exif, mandatory in primary TIFF IFD.
2800118MinSampleValueThe minimum component value used.Baseline 
2810119MaxSampleValueThe maximum component value used.Baseline 
282011AXResolutionThe number of pixels per ResolutionUnit in the ImageWidth direction.BaselineListed in LoC Baseline Tags.

Req'd in LC RFP97-6 Section C.4.7. Provide actual pixel count or pixels per inch.

Req'd in LC NDNP TIFF profile. Xresolution is a Rational; ImageWidth (Tag 256) is the numerator and the length of the source (measured in the units specified in ResolutionUnit (Tag 296)) is the denominator.

Mandatory for TIFF 6.0 classes B, G, P, R, and Y.1

Mandatory for TIFF/EP.

For Exif, mandatory in primary TIFF IFD.

Required by DLF benchmark guidelines
283011BYResolutionThe number of pixels per ResolutionUnit in the ImageLength direction.BaselineListed in LoC Baseline Tags.

Req'd in LC RFP97-6 Section C.4.7. Provide actual pixel count or pixels per inch.

Req'd in LC NDNP TIFF profile. Yresolution is a Rational; ImageLength (Tag 257) is the numerator and the width of the source (measured in the units specified in ResolutionUnit (Tag 296)) is the denominator.

Mandatory for TIFF 6.0 classes B, G, P, R, and Y.1

Mandatory for TIFF/EP.

For Exif, mandatory in primary TIFF IFD.

Required by DLF benchmark guidelines
284011CPlanarConfigurationHow the components of each pixel are stored.BaselineMandatory for TIFF/EP.
285011DPageNameThe name of the page from which this image was scanned.Extended Also used by HD Photo
286011EXPositionX position of the image.Extended 
287011FYPositionY position of the image.Extended 
2880120FreeOffsetsFor each string of contiguous unused bytes in a TIFF file, the byte offset of the string.Baseline 
2890121FreeByteCountsFor each string of contiguous unused bytes in a TIFF file, the number of bytes in the string.Baseline 
2900122GrayResponseUnitThe precision of the information contained in the GrayResponseCurve.Baseline 
2910123GrayResponseCurveFor grayscale data, the optical density of each possible pixel value.Baseline 
2920124T4OptionsOptions for Group 3 Fax compressionExtended 
2930125T6OptionsOptions for Group 4 Fax compressionExtended 
2960128ResolutionUnitThe unit of measurement for XResolution and YResolution.BaselineListed in LoC Baseline Tags.

Req'd in LC RFP97-6 Section C.4.7. Code 1 for actual pixel count or 2 for pixels per inch.

Req'd in LC NDNP TIFF profile. Value 2 for inches is preferred.

Mandatory for TIFF 6.0 classes B, G, P, R, and Y.1

Mandatory for TIFF/EP.

For Exif, mandatory in primary TIFF IFD.
2970129PageNumberThe page number of the page from which this image was scanned.Extended Also used by HD Photo
301012DTransferFunctionDescribes a transfer function for the image in tabular style.Extended 
3050131SoftwareName and version number of the software package(s) used to create the image.Baseline Listed in LoC Baseline Tags. Document states "Acceptable to include only capture software; preferred to list both capture and post-capture processing software (if applicable), separated by ";".

Req'd in LC NDNP TIFF profile. Include version.

Also used by HD Photo.

Mandatory for TIFF/EP.
3060132DateTimeDate and time of image creation.Baseline Listed in LoC Baseline Tags.

Req'd in LC RFP97-6 Section C.4.7. Datetime when scanned.

Req'd in LC NDNP TIFF profile.

Also used by HD Photo.

Usage rule in JHOVE TIFF module.

Mandatory for TIFF/EP.
315013BArtistPerson who created the image.Baseline Listed in LoC Baseline Tags. Document states "Insitution name followed (if applicable) by ";" and name of scanning contractor.

Req'd in LC RFP97-6 Section C.4.7. "Library of Congress."

Req'd in LC NDNP TIFF profile. Provide "institution name; scanning contractor."

Also used by HD Photo
316013CHostComputerThe computer and/or operating system in use at the time of image creation.Baseline Also used by HD Photo
317013DPredictorA mathematical operator that is applied to the image data before an encoding scheme is applied.Extended 
318013EWhitePointThe chromaticity of the white point of the image.Extended 
319013FPrimaryChromaticitiesThe chromaticities of the primaries of the image.Extended 
3200140ColorMapA color map for palette color images.BaselineMandatory for TIFF 6.0 class P.1
3210141HalftoneHintsConveys to the halftone function the range of gray levels within a colorimetrically-specified image that should retain tonal detail.Extended 
3220142TileWidthThe tile width in pixels. This is the number of columns in each tile.ExtendedMandatory for TIFF 6.0 files that use tiles. (Files that use strips employ tags 273, 278, and 279.)

Mandatory in TIFF/EP for tiled images.
3230143TileLengthThe tile length (height) in pixels. This is the number of rows in each tile.ExtendedReferenced in JHOVE TIFF module for files that use tiles. (Files that use strips employ tags 273, 278, and 279.)

Mandatory in TIFF/EP for tiled images.
3240144TileOffsetsFor each tile, the byte offset of that tile, as compressed and stored on disk.ExtendedMandatory for TIFF 6.0 files that use tiles. (Files that use strips employ tags 273, 278, and 279.)

Mandatory in TIFF/EP for tiled images.
3250145TileByteCountsFor each tile, the number of (compressed) bytes in that tile.ExtendedMandatory for TIFF 6.0 files that use tiles. (Files that use strips employ tags 273, 278, and 279.)

Mandatory in TIFF/EP for tiled images.
3260146BadFaxLinesUsed in the TIFF-F standard, denotes the number of 'bad' scan lines encountered by the facsimile device.Extended 
3270147CleanFaxDataUsed in the TIFF-F standard, indicates if 'bad' lines encountered during reception are stored in the data, or if 'bad' lines have been replaced by the receiver.Extended 
3280148ConsecutiveBadFaxLinesUsed in the TIFF-F standard, denotes the maximum number of consecutive 'bad' scanlines received.Extended 
330014ASubIFDsOffset to child IFDs.Extended 
332014CInkSetThe set of inks used in a separated (PhotometricInterpretation=5) image.Extended 
333014DInkNamesThe name of each ink used in a separated image.Extended 
334014ENumberOfInksThe number of inks.Extended 
3360150DotRangeThe component values that correspond to a 0% dot and 100% dot.ExtendedUsage rule in JHOVE TIFF module.
3370151TargetPrinterA description of the printing environment for which this separation is intended.Extended 
3380152ExtraSamplesDescription of extra components.Baseline 
3390153SampleFormatSpecifies how to interpret each data sample in a pixel.Extended 
3400154SMinSampleValueSpecifies the minimum sample value.Extended 
3410155SMaxSampleValueSpecifies the maximum sample value.Extended 
3420156TransferRangeExpands the range of the TransferFunction.Extended 
3430157ClipPathMirrors the essentials of PostScript's path creation functionality.ExtendedUsage rule in JHOVE TIFF module.
3440158XClipPathUnitsThe number of units that span the width of the image, in terms of integer ClipPath coordinates.ExtendedUsage rule in JHOVE TIFF module.
3450159YClipPathUnitsThe number of units that span the height of the image, in terms of integer ClipPath coordinates.Extended 
346015AIndexedAims to broaden the support for indexed images to include support for any color space.Extended 
347015BJPEGTablesJPEG quantization and/or Huffman tables.Extended 
351015FOPIProxyOPI-related.Extended 
4000190GlobalParametersIFDUsed in the TIFF-FX standard to point to an IFD containing tags that are globally applicable to the complete TIFF file.Extended 
4010191ProfileTypeUsed in the TIFF-FX standard, denotes the type of data stored in this file or IFD.Extended 
4020192FaxProfileUsed in the TIFF-FX standard, denotes the 'profile' that applies to this file.Extended 
4030193CodingMethodsUsed in the TIFF-FX standard, indicates which coding methods are used in the file.Extended 
4040194VersionYearUsed in the TIFF-FX standard, denotes the year of the standard specified by the FaxProfile field.Extended 
4050195ModeNumberUsed in the TIFF-FX standard, denotes the mode of the standard specified by the FaxProfile field.Extended 
43301B1DecodeUsed in the TIFF-F and TIFF-FX standards, holds information about the ITULAB (PhotometricInterpretation = 10) encoding.Extended 
43401B2DefaultImageColorDefined in the Mixed Raster Content part of RFC 2301, is the default color needed in areas where no image is available.Extended 
5120200JPEGProcOld-style JPEG compression field. TechNote2 invalidates this part of the specification.Extended 
5130201JPEGInterchangeFormatOld-style JPEG compression field. TechNote2 invalidates this part of the specification.Extended 
5140202JPEGInterchangeFormatLengthOld-style JPEG compression field. TechNote2 invalidates this part of the specification.Extended 
5150203JPEGRestartIntervalOld-style JPEG compression field. TechNote2 invalidates this part of the specification.Extended 
5170205JPEGLosslessPredictorsOld-style JPEG compression field. TechNote2 invalidates this part of the specification.Extended 
5180206JPEGPointTransformsOld-style JPEG compression field. TechNote2 invalidates this part of the specification.Extended 
5190207JPEGQTablesOld-style JPEG compression field. TechNote2 invalidates this part of the specification.Extended 
5200208JPEGDCTablesOld-style JPEG compression field. TechNote2 invalidates this part of the specification.Extended 
5210209JPEGACTablesOld-style JPEG compression field. TechNote2 invalidates this part of the specification.Extended 
5290211YCbCrCoefficientsThe transformation from RGB to YCbCr image data.ExtendedMandatory for TIFF/EP YCbCr images.
5300212YCbCrSubSamplingSpecifies the subsampling factors used for the chrominance components of a YCbCr image.ExtendedMandatory for TIFF/EP YCbCr images.
5310213YCbCrPositioningSpecifies the positioning of subsampled chrominance components relative to luminance samples.ExtendedMandatory for TIFF/EP YCbCr images.
5320214ReferenceBlackWhiteSpecifies a pair of headroom and footroom image data values (codes) for each pixel component.ExtendedMandatory for TIFF 6.0 class Y.1

Mandatory for TIFF/EP YCbCr images.
559022FStripRowCountsDefined in the Mixed Raster Content part of RFC 2301, used to replace RowsPerStrip for IFDs with variable-sized strips.Extended 
70002BCXMPXML packet containing XMP metadataExtended Also used by HD Photo
182464746Image.RatingRatings tag used by WindowsExif private IFD  
18249 4749 Image.RatingPercentRatings tag used by Windows, value as percentExif private IFD  
32781800DImageIDOPI-related.Extended 
3293280A4Wang AnnotationAnnotation data, as used in 'Imaging for Windows'.Private 
33421828DCFARepeatPatternDimFor camera raw files from sensors with CFA overlay.

TIFF/EP spec, p. 23

Exif private IFD

Mandatory in TIFF/EP for CFA files.
33422828ECFAPatternFor camera raw files from sensors with CFA overlay.

TIFF/EP spec, p. 23

Exif private IFD

Mandatory in TIFF/EP for CFA files.
33423828FBatteryLevelEncodes camera battery level at time of image capture.

TIFF/EP spec, p. 45

Exif private IFD

 
334328298CopyrightCopyright notice.Baseline Also used by HD Photo.

Mandatory for TIFF/EP
33434829AExposureTimeExposure time, given in seconds.Exif Private IFD

TIFF/EP spec, p. 38
 
33437829DFNumberThe F number.Exif Private IFD

TIFF/EP spec, p. 39
 
3344582A5MD FileTagSpecifies the pixel data format encoding in the Molecular Dynamics GEL file format.Private 
3344682A6MD ScalePixelSpecifies a scale factor in the Molecular Dynamics GEL file format.Private 
3344782A7MD ColorTableUsed to specify the conversion from 16bit to 8bit in the Molecular Dynamics GEL file format.Private 
3344882A8MD LabNameName of the lab that scanned this file, as used in the Molecular Dynamics GEL file format.Private 
3344982A9MD SampleInfoInformation about the sample, as used in the Molecular Dynamics GEL file format.Private 
3345082AAMD PrepDateDate the sample was prepared, as used in the Molecular Dynamics GEL file format.Private 
3345182ABMD PrepTimeTime the sample was prepared, as used in the Molecular Dynamics GEL file format.Private 
3345282ACMD FileUnitsUnits for data in this file, as used in the Molecular Dynamics GEL file format.Private 
33550830EModelPixelScaleTagUsed in interchangeable GeoTIFF_1_0 files.Private 
3372383BBIPTC/NAAIPTC-NAA (International Press Telecommunications Council-Newspaper Association of America) metadata. TIFF/EP spec, p. 33 Tag name and values defined by IPTC-NAA Info Interchange Model & Digital Newsphoto Parameter Record.

Called IPTS at AWare Web site.
33918847EINGR Packet Data TagIntergraph Application specific storage.Private 
33919847FINGR Flag RegistersIntergraph Application specific flags.Private 
339208480IrasB Transformation MatrixOriginally part of Intergraph's GeoTIFF tags, but likely understood by IrasB only.Private 
339228482ModelTiepointTagOriginally part of Intergraph's GeoTIFF tags, but now used in interchangeable GeoTIFF_1_0 files.Private In GeoTIFF_1_0, either this tag or 34264 must be defined, but not both
34016 SiteSite where image created. TIFF/IT spec, 7.2.3  
34017 ColorSequenceSequence of colors if other than CMYK. TIFF/IT spec, 7.2.8.3.2 For BP and BL only2
34018 IT8HeaderCertain inherited headers. TIFF/IT spec, 7.2.3 Obsolete
34019 RasterPaddingType of raster padding used, if any. TIFF/IT spec, 7.2.6  
34020 BitsPerRunLengthNumber of bits for short run length encoding. TIFF/IT spec, 7.2.6 For LW only2
34021 BitsPerExtendedRunLengthNumber of bits for long run length encoding. TIFF/IT spec, 7.2.6 For LW only2
34022 ColorTableColor value in a color pallette. TIFF/IT spec, 7.2.8.4 For BP and BL only2
34023 ImageColorIndicatorIndicates if image (foreground) color or transparency is specified. TIFF/IT spec, 7.2.9 For MP, BP, and BL only2
34024 BackgroundColorIndicatorBackground color specification. TIFF/IT spec, 7.2.9 For BP and BL only2
34025 ImageColorValueSpecifies image (foreground) color. TIFF/IT spec, 7.2.8.4 For MP, BP, and BL only2
34026 BackgroundColorValueSpecifies background color. TIFF/IT spec, 7.2.8.4 For BP and BL only2
34027 PixelIntensityRangeSpecifies data values for 0 percent and 100 percent pixel intensity. TIFF/IT spec, 7.2.8.4 For MP only2
34028 TransparencyIndicatorSpecifies if transparency is used in HC file. TIFF/IT spec, 7.2.8.4 For HC only2
34029 ColorCharacterizationSpecifies ASCII table or other reference per ISO 12641 and ISO 12642. TIFF/IT spec, 7.2.8.4  
34030 HCUsageIndicates the type of information in an HC file. TIFF/IT spec, 7.2.6 For HC only2
34031 TrapIndicatorIndicates whether or not trapping has been applied to the file. TIFF/IT spec, 7.2.6  
34032 CMYKEquivalentSpecifies CMYK equivalent for specific separations. TIFF/IT spec, 7.2.8.3.4  
34033 ReservedFor future TIFF/IT useTIFF/IT spec 
34034 ReservedFor future TIFF/IT useTIFF/IT spec 
34035 ReservedFor future TIFF/IT useTIFF/IT spec 
3426485D8ModelTransformationTagUsed in interchangeable GeoTIFF_1_0 files.Private In GeoTIFF_1_0, either this tag or 33922 must be defined, but not both
343778649PhotoshopCollection of Photoshop 'Image Resource Blocks'.Private 
346658769Exif IFDA pointer to the Exif IFD.Private Also used by HD Photo.

For Exif, mandatory in primary TIFF IFD, if present.
346758773InterColorProfileICC profile data.

TIFF/EP spec, p. 47

Exif private IFD

Also called ICC Profile.

Also used by HD Photo
3473287ACImageLayerDefined in the Mixed Raster Content part of RFC 2301, used to denote the particular function of this Image in the mixed raster scheme.Extended 
3473587AFGeoKeyDirectoryTagUsed in interchangeable GeoTIFF_1_0 files.Private Mandatory in GeoTIFF_1_0
3473687B0GeoDoubleParamsTagUsed in interchangeable GeoTIFF_1_0 files.Private 
3473787B1GeoAsciiParamsTagUsed in interchangeable GeoTIFF_1_0 files.Private 
348508822ExposureProgramThe class of the program used by the camera to set exposure when the picture is taken.Exif Private IFD

TIFF/EP spec, p. 41
 
348528824SpectralSensitivityIndicates the spectral sensitivity of each channel of the camera used.Exif Private IFD

TIFF/EP spec, p. 48
 
348538825GPSInfoA pointer to the Exif-related GPS Info IFD.

TIFF/EP spec, p. 34

Exif private IFD

Also called GPS IFD.
348558827ISOSpeedRatingsIndicates the ISO Speed and ISO Latitude of the camera or input device as specified in ISO 12232.Exif Private IFD

TIFF/EP spec, p. 47
 
348568828OECFIndicates the Opto-Electric Conversion Function (OECF) specified in ISO 14524.Exif Private IFD

TIFF/EP spec, p. 48
 
348578829InterlaceIndicates the field number of multifield images.

TIFF/EP spec, p. 22

Exif private IFD

 
34858882ATimeZoneOffsetEncodes time zone of camera clock relative to GMT.

TIFF/EP spec, p. 38

Exif private IFD

 
34859882BSelfTimeModeNumber of seconds image capture was delayed from button press.

TIFF/EP spec, p. 45

Exif private IFD

 
348648830SensitivityTypeThe SensitivityType tag indicates PhotographicSensitivity tag, which one of the parameters of ISO 12232. Although it is an optional tag, it should be recorded when a PhotographicSensitivity tag is recorded. Value = 4, 5, 6, or 7 may be used in case that the values of plural parameters are the same.Exif private IFD  
348658831StandardOutputSensitivityThis tag indicates the standard output sensitivity value of a camera or input device defined in ISO 12232. When recording this tag, the PhotographicSensitivity and SensitivityType tags shall also be recorded.Exif private IFD  
348668832RecommendedExposureIndexThis tag indicates the recommended exposure index value of a camera or input device defined in ISO 12232. When recording this tag, the PhotographicSensitivity and SensitivityType tags shall also be recorded.Exif private IFD  
348678833ISOSpeedThis tag indicates the ISO speed value of a camera or input device that is defined in ISO 12232. When recording this tag, the PhotographicSensitivity and SensitivityType tags shall also be recorded.Exif private IFD  
348688834ISOSpeedLatitudeyyyThis tag indicates the ISO speed latitude yyy value of a camera or input device that is defined in ISO 12232. However, this tag shall not be recorded without ISOSpeed and ISOSpeedLatitudezzz.Exif private IFD  
348698835ISOSpeedLatitudezzzThis tag indicates the ISO speed latitude zzz value of a camera or input device that is defined in ISO 12232. However, this tag shall not be recorded without ISOSpeed and ISOSpeedLatitudeyyy.Exif private IFD  
34908885CHylaFAX FaxRecvParamsUsed by HylaFAX.Private 
34909885DHylaFAX FaxSubAddressUsed by HylaFAX.Private 
34910885EHylaFAX FaxRecvTimeUsed by HylaFAX.Private 
368649000ExifVersionThe version of the supported Exif standard.Exif Private IFD Mandatory in the Exif IFD.
368679003DateTimeOriginalThe date and time when the original image data was generated.Exif Private IFD

TIFF/EP spec, p. 37
Mandatory for TIFF/EP.
368689004DateTimeDigitizedThe date and time when the image was stored as digital data.Exif Private IFD 
371219101ComponentsConfigurationSpecific to compressed data; specifies the channels and complements PhotometricInterpretationExif Private IFD 
371229102CompressedBitsPerPixelSpecific to compressed data; states the compressed bits per pixel.Exif Private IFD

TIFF/EP spec, p. 27
 
373779201ShutterSpeedValueShutter speed.Exif Private IFD

TIFF/EP spec, p. 39
 
373789202ApertureValueThe lens aperture.Exif Private IFD

TIFF/EP spec, p. 39
 
373799203BrightnessValueThe value of brightness.Exif Private IFD

TIFF/EP spec, p. 40
 
373809204ExposureBiasValueThe exposure bias.Exif Private IFD

TIFF/EP spec, p. 40
 
373819205MaxApertureValueThe smallest F number of the lens.Exif Private IFD

TIFF/EP spec, p. 40
 
373829206SubjectDistanceThe distance to the subject, given in meters.Exif Private IFD

TIFF/EP spec, p. 44
 
373839207MeteringModeThe metering mode.Exif Private IFD

TIFF/EP spec, p. 41
 
373849208LightSourceThe kind of light source.Exif Private IFD

TIFF/EP spec, p. 46
 
373859209FlashIndicates the status of flash when the image was shot.Exif Private IFD

TIFF/EP spec, p. 42
 
37386920AFocalLengthThe actual focal length of the lens, in mm.Exif Private IFD

TIFF/EP spec, p. 44
 
37387920BFlashEnergyAmount of flash energy (BCPS).

TIFF/EP spec, p. 43

Exif Private IFD

 
37388920CSpatialFrequencyResponseSFR of the camera.

TIFF/EP spec, p. 49

Exif Private IFD

 
37389920DNoiseNoise measurement values.

TIFF/EP spec, p. 49

Exif Private IFD

 
37390920EFocalPlaneXResolutionNumber of pixels per FocalPlaneResolutionUnit (37392) in ImageWidth direction for main image.

TIFF/EP spec, p. 18

Exif Private IFD

 
37391920FFocalPlaneYResolutionNumber of pixels per FocalPlaneResolutionUnit (37392) in ImageLength direction for main image.

TIFF/EP spec, p. 19

Exif Private IFD

 
373929210FocalPlaneResolutionUnitUnit of measurement for FocalPlaneXResolution(37390) and FocalPlaneYResolution(37391).

TIFF/EP spec, p. 19

Exif Private IFD

 
373939211ImageNumberNumber assigned to an image, e.g., in a chained image burst.

TIFF/EP spec, p. 32

Exif Private IFD

 
373949212SecurityClassificationSecurity classification assigned to the image.

TIFF/EP spec, p. 33

Exif Private IFD

 
373959213ImageHistoryRecord of what has been done to the image.

TIFF/EP spec, p. 33

Exif Private IFD

 
373969214SubjectLocationIndicates the location and area of the main subject in the overall scene.Exif Private IFD

TIFF/EP spec, p. 45
Called SubjectArea (from Exif spec) at AWare Web site
373979215ExposureIndexEncodes the camera exposure index setting when image was captured.

TIFF/EP spec, p. 47

Exif Private IFD

 
373989216TIFF/EPStandardIDFor current spec, tag value equals 1 0 0 0.

TIFF/EP spec, p. 16

Exif Private IFD

Mandatory in TIFF/EP.
373999217SensingMethodType of image sensor.

TIFF/EP spec, p. 22

Exif Private IFD

Mandatory in TIFF/EP.
37500927CMakerNoteManufacturer specific information.Exif Private IFD 
375109286UserCommentKeywords or comments on the image; complements ImageDescription.Exif Private IFD 
375209290SubsecTimeA tag used to record fractions of seconds for the DateTime tag.Exif Private IFD 
375219291SubsecTimeOriginalA tag used to record fractions of seconds for the DateTimeOriginal tag.Exif Private IFD 
375229292SubsecTimeDigitizedA tag used to record fractions of seconds for the DateTimeDigitized tag.Exif Private IFD 
37724935CImageSourceDataUsed by Adobe Photoshop.Private 
400919c9bXPTitleTitle tag used by Windows, encoded in UCS2Exif Private IFD 
400929c9cXPCommentComment tag used by Windows, encoded in UCS2Exif Private IFD 
400939c9dXPAuthorAuthor tag used by Windows, encoded in UCS2Exif Private IFD 
400949c9eXPKeywordsKeywords tag used by Windows, encoded in UCS2Exif Private IFD 
400959c9fXPSubjectSubject tag used by Windows, encoded in UCS2Exif Private IFD 
40960A000FlashpixVersionThe Flashpix format version supported by a FPXR file.Exif Private IFD Mandatory in the Exif IFD
40961A001ColorSpaceThe color space information tag is always recorded as the color space specifier.Exif Private IFD Mandatory in the Exif IFD
40962A002PixelXDimensionSpecific to compressed data; the valid width of the meaningful image.Exif Private IFD 
40963A003PixelYDimensionSpecific to compressed data; the valid height of the meaningful image.Exif Private IFD 
40964A004RelatedSoundFileUsed to record the name of an audio file related to the image data.Exif Private IFD 
40965A005Interoperability IFDA pointer to the Exif-related Interoperability IFD.Private 
41483A20BFlashEnergyIndicates the strobe energy at the time the image is captured, as measured in Beam Candle Power SecondsExif Private IFD 
41484A20CSpatialFrequencyResponseRecords the camera or input device spatial frequency table and SFR values in the direction of image width, image height, and diagonal direction, as specified in ISO 12233.Exif Private IFD 
41486A20EFocalPlaneXResolutionIndicates the number of pixels in the image width (X) direction per FocalPlaneResolutionUnit on the camera focal plane.Exif Private IFD 
41487A20FFocalPlaneYResolutionIndicates the number of pixels in the image height (Y) direction per FocalPlaneResolutionUnit on the camera focal plane.Exif Private IFD 
41488A210FocalPlaneResolutionUnitIndicates the unit for measuring FocalPlaneXResolution and FocalPlaneYResolution.Exif Private IFD 
41492A214SubjectLocationIndicates the location of the main subject in the scene.Exif Private IFD 
41493A215ExposureIndexIndicates the exposure index selected on the camera or input device at the time the image is captured.Exif Private IFD 
41495A217SensingMethodIndicates the image sensor type on the camera or input device.Exif Private IFD 
41728A300FileSourceIndicates the image source.Exif Private IFDReq'd in LC NDNP TIFF profile. Values: "microfilm," "microfiche," or "print."
41729A301SceneTypeIndicates the type of scene.Exif Private IFD 
41730A302CFAPatternIndicates the color filter array (CFA) geometric pattern of the image sensor when a one-chip color area sensor is used.Exif Private IFD 
41985A401CustomRenderedIndicates the use of special processing on image data, such as rendering geared to output.Exif Private IFD 
41986A402ExposureModeIndicates the exposure mode set when the image was shot.Exif Private IFD 
41987A403WhiteBalanceIndicates the white balance mode set when the image was shot.Exif Private IFD 
41988A404DigitalZoomRatioIndicates the digital zoom ratio when the image was shot.Exif Private IFD 
41989A405FocalLengthIn35mmFilmIndicates the equivalent focal length assuming a 35mm film camera, in mm.Exif Private IFD 
41990A406SceneCaptureTypeIndicates the type of scene that was shot.Exif Private IFD 
41991A407GainControlIndicates the degree of overall image gain adjustment.Exif Private IFD 
41992A408ContrastIndicates the direction of contrast processing applied by the camera when the image was shot.Exif Private IFD 
41993A409SaturationIndicates the direction of saturation processing applied by the camera when the image was shot.Exif Private IFD 
41994A40ASharpnessIndicates the direction of sharpness processing applied by the camera when the image was shot.Exif Private IFD 
41995A40BDeviceSettingDescriptionThis tag indicates information on the picture-taking conditions of a particular camera model.Exif Private IFD 
41996A40CSubjectDistanceRangeIndicates the distance to the subject.Exif Private IFD 
42016A420ImageUniqueIDIndicates an identifier assigned uniquely to each image.Exif Private IFD Req'd in LC NDNP TIFF profile. Microfilm reel sequence number. If from paper: "issue date-edition-page sequence."
42032a430CameraOwnerNameCamera owner name as ASCII string.Exif Private IFD 
42033a431BodySerialNumberCamera body serial number as ASCII string.Exif Private IFD 
42034a432LensSpecificationThis tag notes minimum focal length, maximum focal length, minimum F number in the minimum focal length, and minimum F number in the maximum focal length, which are specification information for the lens that was used in photography. When the minimum F number is unknown, the notation is 0/0.Exif Private IFD 
42035a433LensMakeLens manufacturer name as ASCII string.Exif Private IFD 
42036a434LensModelLens model name and number as ASCII string.Exif Private IFD 
42037a434LensSerialNumberLens serial number as ASCII string.Exif Private IFD 
42112A480GDAL_METADATAUsed by the GDAL library, holds an XML list of name=value 'metadata' values about the image as a whole, and about specific samples.Private 
42113A481GDAL_NODATAUsed by the GDAL library, contains an ASCII encoded nodata or background pixel value.Private 
48129BC01PixelFormatA 128-bit Globally Unique Identifier (GUID) that identifies the image pixel format.HD Photo Feature Spec, p. 17 
48130BC02TransformationSpecifies the transformation to be applied when decoding the image to present the desired representation.HD Photo Feature Spec, p. 23 
48131BC03UncompressedSpecifies that image data is uncompressed.HD Photo Feature Spec, p. 23 
48132BC04ImageTypeSpecifies the image type of each individual frame in a multi-frame file.HD Photo Feature Spec, p. 27 
48256BC80ImageWidthSpecifies the number of columns in the transformed photo, or the number of pixels per scan line.HD Photo Feature Spec, p. 21 
48257BC81ImageHeightSpecifies the number of pixels or scan lines in the transformed photo.HD Photo Feature Spec, p. 21 
48258BC82WidthResolutionSpecifies the horizontal resolution of a transformed image expressed in pixels per inch.HD Photo Feature Spec, p. 21 
48259BC83HeightResolutionSpecifies the vertical resolution of a transformed image expressed in pixels per inch.HD Photo Feature Spec, p. 21 
48320BCC0ImageOffsetSpecifies the byte offset pointer to the beginning of the photo data, relative to the beginning of the file.HD Photo Feature Spec, p. 22 
48321BCC1ImageByteCountSpecifies the size of the photo in bytes.HD Photo Feature Spec, p. 22 
48322BCC2AlphaOffsetSpecifies the byte offset pointer the beginning of the planar alpha channel data, relative to the beginning of the file.HD Photo Feature Spec, p. 22 
48323BCC3AlphaByteCountSpecifies the size of the alpha channel data in bytes.HD Photo Feature Spec, p. 23 
48324BCC4ImageDataDiscardSignifies the level of data that has been discarded from the image as a result of a compressed domain transcode to reduce the file size.HD Photo Feature Spec, p. 25 
48325BCC5AlphaDataDiscardSignifies the level of data that has been discarded from the planar alpha channel as a result of a compressed domain transcode to reduce the file size.HD Photo Feature Spec, p. 26 
48132BC04ImageTypeSpecifies the image type of each individual frame in a multi-frame file.HD Photo Feature Spec, p. 27 
50215C427Oce Scanjob DescriptionUsed in the Oce scanning process.Private 
50216C428Oce Application SelectorUsed in the Oce scanning process.Private 
50217C429Oce Identification NumberUsed in the Oce scanning process.Private 
50218C42AOce ImageLogic CharacteristicsUsed in the Oce scanning process.Private 
50341c4a5PrintImageMatchingDescription needed.Exif Private IFD 
50706C612DNGVersion Encodes DNG four-tier version number; for version 1.1.0.0, the tag contains the bytes 1, 1, 0, 0. Used in IFD 0 of DNG files.

DNG spec (1.3, 2009), p. 17

Exif Private IFD

 
50707C613DNGBackwardVersion Defines oldest version of spec with which file is compatible. Used in IFD 0 of DNG files.

DNG spec (1.3, 2009), p. 17

Exif Private IFD

 
50708C614UniqueCameraModel Unique, non-localized nbame for camera model. Used in IFD 0 of DNG files.

DNG spec (1.3, 2009), p. 18

Exif Private IFD

 
50709C615LocalizedCameraModel Similar to 50708, with localized camera name. Used in IFD 0 of DNG files.

DNG spec (1.3, 2009), p. 19

Exif Private IFD

 
50710C616CFAPlaneColor Mapping between values in the CFAPattern tag and the plane numbers in LinearRaw space. Used in Raw IFD of DNG files.

DNG spec (1.3, 2009), p. 19

Exif Private IFD

Required for non-RGB CFA images.
50711C617CFALayout Spatial layout of the CFA. Used in Raw IFD of DNG files.

DNG spec (1.3, 2009), p. 20

Exif Private IFD

 
50712C618LinearizationTable Lookup table that maps stored values to linear values. Used in Raw IFD of DNG files.

DNG spec (1.3, 2009), p. 21

Exif Private IFD

 
50713C619BlackLevelRepeatDim Repeat pattern size for BlackLevel tag. Used in Raw IFD of DNG files.

DNG spec (1.3, 2009), p. 21

Exif Private IFD

 
50714C61ABlackLevel Specifies the zero light encoding level.Used in Raw IFD of DNG files.

DNG spec (1.3, 2009), p. 22

Exif Private IFD

 
50715C61BBlackLevelDeltaH Specifies the difference between zero light encoding level for each column and the baseline zero light encoding level. Used in Raw IFD of DNG files.

DNG spec (1.3, 2009), p. 22

Exif Private IFD

 
50716C61CBlackLevelDeltaV Specifies the difference between zero light encoding level for each row and the baseline zero light encoding level. Used in Raw IFD of DNG files.

DNG spec (1.3, 2009), p. 23

Exif Private IFD

 
50717C61DWhiteLevel Specifies the fully saturated encoding level for the raw sample values. Used in Raw IFD of DNG files.

DNG spec (1.3, 2009), p. 24

Exif Private IFD

 
50718C61EDefaultScale For cameras with non-square pixels, specifies the default scale factors for each direction to convert the image to square pixels. Used in Raw IFD of DNG files.

DNG spec (1.3, 2009), p. 24

Exif Private IFD

 
50719C61FDefaultCropOrigin Specifies the origin of the final image area, ignoring the extra pixels at edges used to prevent interpolation artifacts. Used in Raw IFD of DNG files.

DNG spec (1.3, 2009), p. 25

Exif Private IFD

 
50720C620DefaultCropSize Specifies size of final image area in raw image coordinates. Used in Raw IFD of DNG files.

DNG spec (1.3, 2009), p. 26

Exif Private IFD

 
50721C621ColorMatrix1 Defines a transformation matrix that converts XYZ values to reference camera native color space values, under the first calibration illuminant. Used in IFD 0 of DNG files.

DNG spec (1.3, 2009), p. 27

Exif Private IFD

 
50722C622ColorMatrix2 Defines a transformation matrix that converts XYZ values to reference camera native color space values, under the second calibration illuminant. Used in IFD 0 of DNG files.

DNG spec (1.3, 2009), p. 28

Exif Private IFD

 
50723C623CameraCalibration1 Defines a calibration matrix that transforms reference camera native space values to individual camera native space values under the first calibration illuminant. Used in IFD 0 of DNG files.

DNG spec (1.3, 2009), p. 28

Exif Private IFD

 
50724C624CameraCalibration2 Defines a calibration matrix that transforms reference camera native space values to individual camera native space values under the second calibration illuminant. Used in IFD 0 of DNG files.

DNG spec (1.3, 2009), p. 29

Exif Private IFD

 
50725C625ReductionMatrix1 Defines a dimensionality reduction matrix for use as the first stage in converting color camera native space values to XYZ values, under the first calibration illuminant. Used in IFD 0 of DNG files.

DNG spec (1.3, 2009), p. 30

Exif Private IFD

 
50726C626ReductionMatrix2 Defines a dimensionality reduction matrix for use as the first stage in converting color camera native space values to XYZ values, under the second calibration illuminant. Used in IFD 0 of DNG files.

DNG spec (1.3, 2009), p. 30

Exif Private IFD

 
50727C627AnalogBalance Pertaining to white balance, defines the gain, either analog or digital, that has been applied to the stored raw values. Used in IFD 0 of DNG files.

DNG spec (1.3, 2009), p. 31

Exif Private IFD

 
50728C628AsShotNeutral Specifies the selected white balance at the time of capture, encoded as the coordinates of a perfectly neutral color in linear reference space values. Used in IFD 0 of DNG files.

DNG spec (1.3, 2009), p. 31

Exif Private IFD

 
50729C629AsShotWhiteXY Specifies the selected white balance at the time of capture, encoded as x-y chromaticity coordinates. Used in IFD 0 of DNG files.

DNG spec (1.3, 2009), p. 32

Exif Private IFD

 
50730C62ABaselineExposure Specifies in EV units how much to move the zero point for exposure compensation. Used in IFD 0 of DNG files.

DNG spec (1.3, 2009), p. 32

Exif Private IFD

 
50731C62BBaselineNoise Specifies the relative noise of the camera model at a baseline ISO value of 100, compared to reference camera model. Used in IFD 0 of DNG files.

DNG spec (1.3, 2009), p. 33

Exif Private IFD

 
50732C62CBaselineSharpness Specifies the relative amount of sharpening required for this camera model, compared to reference camera model. Used in IFD 0 of DNG files.

DNG spec (1.3, 2009), p. 33

Exif Private IFD

 
50733C62DBayerGreenSplit For CFA images, specifies, in arbitrary units, how closely the values of the green pixels in the blue/green rows track the values of the green pixels in the red/green rows. Used in Raw IFD of DNG files.

DNG spec (1.3, 2009), p. 34

Exif Private IFD

 
50734C62ELinearResponseLimit Specifies the fraction of the encoding range above which the response may become significantly non-linear. Used in IFD 0 of DNG files.

DNG spec (1.3, 2009), p. 34

Exif Private IFD

 
50735C62FCameraSerialNumber Serial number of camera. Used in IFD 0 of DNG files.

DNG spec (1.3, 2009), p. 35

Exif Private IFD

 
50736C630LensInfo Information about the lens. Used in IFD 0 of DNG files.

DNG spec (1.3, 2009), p. 35

Exif Private IFD

 
50737C631ChromaBlurRadius Normally for non-CFA images, provides a hint about how much chroma blur ought to be applied. Used in Raw IFD of DNG files.

DNG spec (1.3, 2009), p. 36

Exif Private IFD

 
50738C632AntiAliasStrength Provides a hint about the strength of the camera's anti-aliasing filter. Used in Raw IFD of DNG files.

DNG spec (1.3, 2009), p. 36

Exif Private IFD

 
50739 ShadowScale Used by Adobe Camera Raw to control sensitivity of its shadows slider. Used in IFD 0 of DNG files.

DNG spec (1.3, 2009), p. 37

Exif Private IFD

 
50740C634DNGPrivateData Provides a way for camera manufacturers to store private data in DNG files for use by their own raw convertors. Used in IFD 0 of DNG files.

DNG spec (1.3, 2009), p. 37

Exif Private IFD

 
50741C635MakerNoteSafety Lets the DNG reader know whether the Exif MakerNote tag is safe to preserve. Used in IFD 0 of DNG files.

DNG spec (1.3, 2009), p. 38

Exif Private IFD

 
50778C65ACalibrationIlluminant1 Illuminant used for first set of calibration tags. Used in IFD 0 of DNG files.

DNG spec (1.3, 2009), p. 26

Exif Private IFD

 
50779C65BCalibrationIlluminant2 Illuminant used for second set of calibration tags. Used in IFD 0 of DNG files.

DNG spec (1.3, 2009), p. 27

Exif Private IFD

 
50780C65CBestQualityScale Specifies the amount by which the values of the DefaultScale tag need to be multiplied to achieve best quality image size. Used in Raw IFD of DNG files.

DNG spec (1.3, 2009), p. 25

Exif Private IFD

 
50781 RawDataUniqueID Contains a 16-byte unique identifier for the raw image file in the DNG file. Used in IFD 0 of DNG files.

DNG spec (1.3, 2009), p. 39

Exif Private IFD

 
50784C660Alias Layer MetadataAlias Sketchbook Pro layer usage description.Private 
50827 OriginalRawFileName Name of original file if the DNG file results from conversion from a non-DNG raw file. Used in IFD 0 of DNG files.

DNG spec (1.3, 2009), p. 39

Exif Private IFD

 
50828 OriginalRawFileData If the DNG file was converted from a non-DNG raw file, then this tag contains the original raw data. Used in IFD 0 of DNG files.

DNG spec (1.3, 2009), p. 40

Exif Private IFD

 
50829 ActiveArea Defines the active (non-masked) pixels of the sensor. Used in Raw IFD of DNG files.

DNG spec (1.3, 2009), p. 41

Exif Private IFD

 
50830 MaskedAreas List of non-overlapping rectangle coordinates of fully masked pixels, which can optimally be used by DNG readers to measure the black encoding level. Used in Raw IFD of DNG files.

DNG spec (1.3, 2009), p. 42

Exif Private IFD

 
50831 AsShotICCProfile Contains ICC profile that, in conjunction with the AsShotPreProfileMatrix tag, specifies a default color rendering from camera color space coordinates (linear reference values) into the ICC profile connection space. Used in IFD 0 of DNG files.

DNG spec (1.3, 2009), p. 42

Exif Private IFD

 
50832 AsShotPreProfileMatrix Specifies a matrix that should be applied to the camera color space coordinates before processing the values through the ICC profile specified in the AsShotICCProfile tag. Used in IFD 0 of DNG files.

DNG spec (1.3, 2009), p. 43

Exif Private IFD

 
50833 CurrentICCProfile The CurrentICCProfile and CurrentPreProfileMatrix tags have the same purpose and usage as
the AsShotICCProfile and AsShotPreProfileMatrix tag pair, except they are for use by raw file
editors rather than camera manufacturers. Used in IFD 0 of DNG files.

DNG spec (1.3, 2009), p. 44

Exif Private IFD

 
50834 CurrentPreProfileMatrix The CurrentICCProfile and CurrentPreProfileMatrix tags have the same purpose and usage as
the AsShotICCProfile and AsShotPreProfileMatrix tag pair, except they are for use by raw file
editors rather than camera manufacturers. Used in IFD 0 of DNG files.

DNG spec (1.3, 2009), p. 44

Exif Private IFD

 
50879C6BFColorimetricReference The DNG color model documents a transform between camera colors and CIE XYZ values. This tag describes the colorimetric reference for the CIE XYZ values. 0 = The XYZ values are scene-referred. 1 = The XYZ values are output-referred, using the ICC profile perceptual dynamic range. Used in IFD 0 of DNG files.

DNG spec (1.3, 2009), p. 45

Exif Private IFD

 
50931C6F3CameraCalibrationSignature A UTF-8 encoded string associated with the CameraCalibration1 and CameraCalibration2 tags. Used in IFD 0 of DNG files.

DNG spec (1.3, 2009), p. 46

Exif Private IFD

 
50932C6F4ProfileCalibrationSignature A UTF-8 encoded string associated with the camera profile tags. Used in IFD 0 or CameraProfile IFD of DNG files.

DNG spec (1.3, 2009), p. 46

Exif Private IFD

 
50933C6F5ExtraCameraProfiles A list of file offsets to extra Camera Profile IFDs. The format of a camera profile begins with a 16-bit byte order mark (MM or II) followed by a 16-bit "magic" number equal to 0x4352 (CR), a 32-bit IFD offset, and then a standard TIFF format IFD. Used in IFD 0 of DNG files.

DNG spec (1.3, 2009), p. 47

 
50934C6F6AsShotProfileName A UTF-8 encoded string containing the name of the "as shot" camera profile, if any. Used in IFD 0 of DNG files.

DNG spec (1.3, 2009), p. 47

Exif Private IFD

 
50935C6F7NoiseReductionApplied Indicates how much noise reduction has been applied to the raw data on a scale of 0.0 to 1.0. A 0.0 value indicates that no noise reduction has been applied. A 1.0 value indicates that the "ideal" amount of noise reduction has been applied, i.e. that the DNG reader should not apply additional noise reduction by default. A value of 0/0 indicates that this parameter is unknown. Used in Raw IFD of DNG files.

DNG spec (1.3, 2009), p. 48

Exif Private IFD

 
50936C6F8ProfileName A UTF-8 encoded string containing the name of the camera profile. Used in IFD 0 or Camera Profile IFD of DNG files.

DNG spec (1.3, 2009), p. 48

Exif Private IFD

 
50937C6F9ProfileHueSatMapDims Specifies the number of input samples in each dimension of the hue/saturation/value mapping tables. The data for these tables are stored in ProfileHueSatMapData1 and ProfileHueSatMapData2 tags. Allowed values include the following: HueDivisions >= 1; SaturationDivisions >= 2; ValueDivisions >=1. Used in IFD 0 or Camera Profile IFD of DNG files.

DNG spec (1.3, 2009), p. 49

Exif Private IFD

 
50938C6FAProfileHueSatMapData1 Contains the data for the first hue/saturation/value mapping table. Each entry of the table contains three 32-bit IEEE floating-point values. The first entry is hue shift in degrees; the second entry is saturation scale factor; and the third entry is a value scale factor. Used in IFD 0 or Camera Profile IFD of DNG files.

DNG spec (1.3, 2009), p. 50

Exif Private IFD

 
50939C6FBProfileHueSatMapData2 Contains the data for the second hue/saturation/value mapping table. Each entry of the table contains three 32-bit IEEE floating-point values. The first entry is hue shift in degrees; the second entry is saturation scale factor; and the third entry is a value scale factor. Used in IFD 0 or Camera Profile IFD of DNG files.

DNG spec (1.3, 2009), p. 50-1

Exif Private IFD

 
50940C6FCProfileToneCurve Contains a default tone curve that can be applied while processing the image as a starting point for user adjustments. The curve is specified as a list of 32-bit IEEE floating-point value pairs in linear gamma. Each sample has an input value in the range of 0.0 to 1.0, and an output value in the range of 0.0 to 1.0. The first sample is required to be (0.0, 0.0), and the last sample is required to be (1.0, 1.0). Interpolated the curve using a cubic spline. Used in IFD 0 or Camera Profile IFD of DNG files.

DNG spec (1.3, 2009), p. 51

Exif Private IFD

 
50941C6FDProfileEmbedPolicy Contains information about the usage rules for the associated camera profile. The valid values and meanings are: 0 = “allow copying”; 1 = “embed if used”; 2 = “embed never”; and 3 = “no restrictions”. Used in IFD 0 or Camera Profile IFD of DNG files.

DNG spec (1.3, 2009), p. 52

Exif Private IFD

 
50942C6FEProfileCopyright Contains information about the usage rules for the associated camera profile. The valid values and meanings are: 0 = “allow copying”; 1 = “embed if used”; 2 = “embed never”; and 3 = “no restrictions”. Used in IFD 0 or Camera Profile IFD of DNG files.

DNG spec (1.3, 2009), p. 52

Exif Private IFD

 
50964C714ForwardMatrix1 Defines a matrix that maps white balanced camera colors to XYZ D50 colors. Used in IFD 0 or Camera Profile IFD of DNG files.

DNG spec (1.3, 2009), p. 53

Exif Private IFD

 
50965C715ForwardMatrix2 Defines a matrix that maps white balanced camera colors to XYZ D50 colors. Used in IFD 0 or Camera Profile IFD of DNG files.

DNG spec (1.3, 2009), p. 54

Exif Private IFD

 
50966C716PreviewApplicationName A UTF-8 encoded string containing the name of the application that created the preview stored in the IFD. Used in Preview IFD of DNG files.

DNG spec (1.3, 2009), p. 54

Exif Private IFD

 
50967C717PreviewApplicationVersion A UTF-8 encoded string containing the version number of the application that created the preview stored in the IFD. Used in Preview IFD of DNG files.

DNG spec (1.3, 2009), p. 55

Exif Private IFD

 
50968C718PreviewSettingsName A UTF-8 encoded string containing the name of the conversion settings (for example, snapshot name) used for the preview stored in the IFD. Used in Preview IFD of DNG files.

DNG spec (1.3, 2009), p. 55

Exif Private IFD

 
50969C719PreviewSettingsDigest A unique ID of the conversion settings (for example, MD5 digest) used to render the preview stored in the IFD. Used in Preview IFD of DNG files.

DNG spec (1.3, 2009), p. 56

Exif Private IFD

 
50970C71APreviewColorSpace This tag specifies the color space in which the rendered preview in this IFD is stored. The valid values include: 0 = Unknown; 1 = Gray Gamma 2.2; 2 = sRGB; 3 = Adobe RGB; and 4 = ProPhoto RGB. Used in Preview IFD of DNG files.

DNG spec (1.3, 2009), p. 56

Exif Private IFD

 
50971C71BPreviewDateTime This tag is an ASCII string containing the name of the date/time at which the preview stored in the IFD was rendered, encoded using ISO 8601 format. Used in Preview IFD of DNG files.

DNG spec (1.3, 2009), p. 57

Exif Private IFD

 
50972C71CRawImageDigest MD5 digest of the raw image data. All pixels in the image are processed in row-scan order. Each pixel is zero padded to 16 or 32 bits deep (16-bit for data less than or equal to 16 bits deep, 32-bit otherwise). The data is processed in little-endian byte order. Used in IFD 0 of DNG files.

DNG spec (1.3, 2009), p. 57

Exif Private IFD

 
50973C71DOriginalRawFileDigest MD5 digest of the data stored in the OriginalRawFileData tag. Used in IFD 0 of DNG files.

DNG spec (1.3, 2009), p. 58

Exif Private IFD

 
50974C71ESubTileBlockSize Normally, pixels within a tile are stored in simple row-scan order. This tag specifies that the pixels within a tile should be grouped first into rectangular blocks of the specified size. These blocks are stored in row-scan order. Within each block, the pixels are stored in row-scan order. Used in Raw IFD of DNG files.

DNG spec (1.3, 2009), p. 58

Exif Private IFD

 
50975C71FRowInterleaveFactor Specifies that rows of the image are stored in interleaved order. The value of the tag specifies the number of interleaved fields. Used in Raw IFD of DNG files.

DNG spec (1.3, 2009), p. 59

Exif Private IFD

 
50981C725ProfileLookTableDims Specifies the number of input samples in each dimension of a default "look" table. The data for this table is stored in the ProfileLookTableData tag. Allowed values include: HueDivisions >= 1; SaturationDivisions >= 2; and ValueDivisions >= 1. Used in IFD 0 or Camera Profile IFD of DNG files.

DNG spec (1.3, 2009), p. 59

Exif Private IFD

 
50982C726ProfileLookTableData Default "look" table that can be applied while processing the image as a starting point for user adjustment. This table uses the same format as the tables stored in the ProfileHueSatMapData1 and ProfileHueSatMapData2 tags, and is applied in the same color space. However, it should be applied later in the processing pipe, after any exposure compensation and/or fill light stages, but before any tone curve stage. Each entry of the table contains three 32-bit IEEE floating-point values. The first entry is hue shift in degrees, the second entry is a saturation scale factor, and the third entry is a value scale factor. Used in IFD 0 or Camera Profile IFD of DNG files.

DNG spec (1.3, 2009), p. 60

Exif Private IFD

 
51008C740OpcodeList1 Specifies the list of opcodes (image processing operation codes) that should be applied to the raw image, as read directly from the file. Used in Raw IFD of DNG files.

DNG spec (1.3, 2009), p. 61

Exif Private IFD

 
51009C741OpcodeList2 Specifies the list of opcodes (image processing operation codes) that should be applied to the raw image, just after it has been mapped to linear reference values. Used in Raw IFD of DNG files.

DNG spec (1.3, 2009), p. 61

Exif Private IFD

 
51022C74EOpcodeList3 Specifies the list of opcodes (image processing operation codes) that should be applied to the raw image, just after it has been demosaiced. Used in Raw IFD of DNG files.

DNG spec (1.3, 2009), p. 62

Exif Private IFD

 
51041C761NoiseProfile Describes the amount of noise in a raw image; models the amount of signal-dependent photon (shot) noise and signal-independent sensor readout noise, two common sources of noise in raw images. Used in Raw IFD of DNG files.

DNG spec (1.3, 2009), p. 62-3

Exif Private IFD

 
51089C791OriginalDefaultFinalSize If this file is a proxy for a larger original DNG file, this tag specifics the default final size of the larger original file from which this proxy was generated. The default value for this tag is default final size of the current DNG file, which is DefaultCropSize * DefaultScale. DNG spec (1.4, 2012), p. 74 
51090C792OriginalBestQualityFinalSize If this file is a proxy for a larger original DNG file, this tag specifics the best quality final size of the larger original file from which this proxy was generated. The default value for this tag is the OriginalDefaultFinalSize, if specified. Otherwise the default value for this tag is the best quality size of the current DNG file, which is DefaultCropSize * DefaultScale * BestQualityScale. DNG spec (1.4, 2012), p. 75 
51091C793OriginalDefaultCropSize If this file is a proxy for a larger original DNG file, this tag specifics the DefaultCropSize of the larger original file from which this proxy was generated. The default value for this tag is the OriginalDefaultFinalSize, if specified. Otherwise, the default value for this tag is the DefaultCropSize of the current DNG file. DNG spec (1.4, 2012), p. 75 
51107C7A3ProfileHueSatMapEncoding Provides a way for color profiles to specify how indexing into a 3D HueSatMap is performed during raw conversion. This tag is not applicable to 2.5D HueSatMap tables (i.e., where the Value dimension is 1). The currently defined values are: 0 = Linear encoding (method described in DNG spec); 1 = sRGB encoding (method described in DNG spec). DNG spec (1.4, 2012), p. 73 
51108C7A4ProfileLookTableEncoding Provides a way for color profiles to specify how indexing into a 3D LookTable is performed during raw conversion. This tag is not applicable to a 2.5D LookTable (i.e., where the Value dimension is 1). The currently defined values are: 0 = Linear encoding (method described in DNG spec); 1 = sRGB encoding (method described in DNG spec). DNG spec (1.4, 2012), p. 72-3 
51109C7A5BaselineExposureOffset Provides a way for color profiles to increase or decrease exposure during raw conversion. BaselineExposureOffset specifies the amount (in EV units) to add to th e BaselineExposure tag during image rendering. For example, if the BaselineExposure value fo r a given camera model is +0.3, and the BaselineExposureOffset value for a given camera profile used to render an image for that camera model is -0.7, then th e actual default exposure value used during rendering will be +0.3 - 0.7 = -0.4. DNG spec (1.4, 2012), p. 71 
51110C7A6DefaultBlackRender This optional tag in a color profile provides a hint to the raw converter regarding how to handle the black point (e.g., flare subtraction) during rendering. The currently defined values are: 0 = Auto; 1 = None. If set to Auto, the raw converter should perform black subtraction during rendering. The amount and method of black subtraction may be automatically determined and may be image-dependent. If set to None, the raw converter should not perform any black subtraction during rendering. This may be desirable when using color lookup tables (e.g., LookTable) or tone curves in camera profiles to perform a fixed, consistent level of black subtraction. DNG spec (1.4, 2012), p. 71 
51111C7A7NewRawImageDigest This tag is a modified MD5 digest of the raw image data. It has been updated from the algorithm used to compute the RawImageDigest tag be more multi-processor friendly, and to support lossy compression algorithms. The details of the algorithm used to compute this tag are documented in the Adobe DNG SDK source code. DNG spec (1.4, 2012), p. 76 
51112C7A8RawToPreviewGain The gain (what number the sample values are multiplied by) between the main raw IFD and the preview IFD containing this tag. DNG spec (1.4, 2012), p. 76 
51125C7B5DefaultUserCrop Specifies a default user crop rectangle in relative coordinates. The values must satisfy: 0.0 <= top < bottom <= 1.0; 0.0 <= left < right <= 1.0. The default values of (top = 0, left = 0, bottom = 1, right = 1) correspond exactly to the default crop rectangle (as specified by the DefaultCropOrigin and DefaultCropSize tags). DNG spec (1.4, 2012), p. 70 

1TIFF image classes are described in the 1992 TIFF 6.0 specification and may be summarized as follows:
• Class B. Baseline bilevel.
• Class G. Baseline grayscale.
• Class P. Baseline palette-color.
• Class R. Baseline RGB.
• Class Y. Extension YCbCr.

2The TIFF/IT specification (ISO 12639, 2004) defines the following image categories:
• CT. Color continuous-tone picture.
• LW. Color line art.
• HC. High-resolution continuous-tone.
• MP. Monochrome continuous-tone picture.
• BP. Binary picture.
• BL. Binary line art.
• SD. Screened data image.
• FP. Final page.

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Last Updated: 03/27/2014