DNG tags

These are the tags the DNG specification adds to TIFF, in number order. “IFD 0” tags describe the whole file and sit in the first directory; “Raw” tags belong to the directory that holds the raw image (see raw data). Several numbers in this range belong to other makers, listed at the end.

Version and camera

Tag	Name	Type	IFD	Meaning
`0xC612`	DNGVersion	BYTE × 4	IFD 0	Version of the specification the file follows, such as 1, 7, 1, 0. Required; marks the file as DNG.
`0xC613`	DNGBackwardVersion	BYTE × 4	IFD 0	Oldest reader version that can read the file.
`0xC614`	UniqueCameraModel	ASCII	IFD 0	Unique, non-localised name of the camera model, used to find profiles.
`0xC615`	LocalizedCameraModel	ASCII or BYTE	IFD 0	Camera model name for display.
`0xC62F`	CameraSerialNumber	ASCII	IFD 0	Serial number of the camera.
`0xC630`	LensInfo	RATIONAL × 4	IFD 0	Shortest and longest focal length, and the widest aperture at each.
`0xC634`	DNGPrivateData	BYTE	IFD 0	Private data for the program that wrote the file, starting with its name ended by a zero byte.
`0xC635`	MakerNoteSafety	SHORT	IFD 0	0 unsafe, 1 safe: whether the maker note can be kept when the file is edited.

Raw image

Tag	Name	Type	IFD	Meaning
`0xC616`	CFAPlaneColor	BYTE	Raw	Colour of each plane, as CFAPattern codes; default 0, 1, 2 (red, green, blue).
`0xC617`	CFALayout	SHORT	Raw	Spatial layout of the sensor, 1 to 9 (see raw data); default 1.
`0xC618`	LinearizationTable	SHORT × n	Raw	Lookup table that maps stored values to linear values.
`0xC619`	BlackLevelRepeatDim	SHORT × 2	Raw	Rows and columns of the repeating black level pattern; default 1, 1.
`0xC61A`	BlackLevel	SHORT, LONG or RATIONAL	Raw	Zero light level, per pattern cell and sample; default 0.
`0xC61B`	BlackLevelDeltaH	SRATIONAL × width	Raw	Extra black level per column.
`0xC61C`	BlackLevelDeltaV	SRATIONAL × height	Raw	Extra black level per row.
`0xC61D`	WhiteLevel	SHORT or LONG	Raw	Fully saturated level per sample; default 2^{BitsPerSample} − 1.
`0xC61E`	DefaultScale	RATIONAL × 2	Raw	Horizontal and vertical scale to square pixels; default 1, 1.
`0xC61F`	DefaultCropOrigin	SHORT, LONG or RATIONAL × 2	Raw	Top left of the final image, in raw pixels relative to the active area.
`0xC620`	DefaultCropSize	SHORT, LONG or RATIONAL × 2	Raw	Width and height of the final image.
`0xC62D`	BayerGreenSplit	LONG	Raw	How much the two greens of a Bayer sensor differ, 0 (none) upwards.
`0xC631`	ChromaBlurRadius	RATIONAL	Raw	Chroma blur radius in pixels to remove colour noise.
`0xC632`	AntiAliasStrength	RATIONAL	Raw	Strength of the camera’s anti-alias filter, 0.0 (none) to 1.0; default 1.0.
`0xC65C`	BestQualityScale	RATIONAL	Raw	Extra scale factor for best quality output; default 1.0.
`0xC68D`	ActiveArea	SHORT or LONG × 4	Raw	Top, left, bottom, right of the area that holds image data.
`0xC68E`	MaskedAreas	SHORT or LONG × 4n	Raw	Rectangles of covered pixels, for measuring black.
`0xC6F7`	NoiseReductionApplied	RATIONAL	Raw	Noise reduction already applied, 0.0 none to 1.0 full; 0/0 unknown.
`0xC71E`	SubTileBlockSize	SHORT or LONG × 2	Raw	Rows and columns of sub-tile blocks interleaved in each tile.
`0xC71F`	RowInterleaveFactor	SHORT or LONG	Raw	Number of interleaved fields of rows; default 1.
`0xC740`	OpcodeList1	UNDEFINED	Raw	Opcodes applied to the raw values as read (see opcodes).
`0xC741`	OpcodeList2	UNDEFINED	Raw	Opcodes applied after linearisation and black and white scaling.
`0xC74E`	OpcodeList3	UNDEFINED	Raw	Opcodes applied after demosaicing.
`0xC761`	NoiseProfile	DOUBLE × 2n	Raw	Noise model: a scale and an offset per plane (variance = scale × signal + offset).
`0xC7B5`	DefaultUserCrop	RATIONAL × 4	Raw	Suggested crop: top, left, bottom, right as fractions of the default crop.
`0xCD2E`	SemanticName	ASCII	Mask	Name of the semantic mask, such as sky.
`0xCD30`	SemanticInstanceID	ASCII	Mask	Identifies one instance among masks of the same name.
`0xCD38`	MaskSubArea	LONG × 4	Mask	Where a mask sits within the main image.
`0xCD43`	ColumnInterleaveFactor	LONG	Raw	Number of interleaved fields of columns; default 1.

Colour

Tags numbered 1, 2 and 3 belong to calibration illuminants 1, 2 and 3. Matrices have as many rows or columns as the image has colour planes (3 or 4).

Tag	Name	Type	IFD	Meaning
`0xC621`, `0xC622`, `0xCD33`	ColorMatrix1, 2, 3	SRATIONAL × 3n	IFD 0	Matrix from CIE XYZ to reference camera colour, under each illuminant.
`0xC623`, `0xC624`, `0xCD32`	CameraCalibration1, 2, 3	SRATIONAL × n²	IFD 0	Matrix from reference camera colour to this camera’s colour.
`0xC625`, `0xC626`, `0xCD3A`	ReductionMatrix1, 2, 3	SRATIONAL × 3n	IFD 0	Reduces camera colour with more than 3 planes to 3.
`0xC714`, `0xC715`, `0xCD34`	ForwardMatrix1, 2, 3	SRATIONAL × 3n	IFD 0	Matrix from white-balanced camera colour to CIE XYZ (D50).
`0xC65A`, `0xC65B`, `0xCD31`	CalibrationIlluminant1, 2, 3	SHORT	IFD 0	The light source of each calibration (codes below).
`0xCD35`–`0xCD37`	IlluminantData1, 2, 3	UNDEFINED	IFD 0	The spectrum or chromaticity of an illuminant whose code is 255 (other).
`0xC627`	AnalogBalance	RATIONAL × n	IFD 0	Gain applied to each plane before digitising.
`0xC628`	AsShotNeutral	SHORT or RATIONAL × n	IFD 0	The white balance as shot, as a neutral colour in camera space.
`0xC629`	AsShotWhiteXY	RATIONAL × 2	IFD 0	The white balance as shot, as x, y chromaticity (instead of AsShotNeutral).
`0xC62A`	BaselineExposure	SRATIONAL	IFD 0	Exposure shift in stops for a camera model, so that zero is a normal exposure.
`0xC62B`	BaselineNoise	RATIONAL	IFD 0	Relative noise at ISO 100, against a reference camera; default 1.0.
`0xC62C`	BaselineSharpness	RATIONAL	IFD 0	Relative sharpening needed; default 1.0.
`0xC62E`	LinearResponseLimit	RATIONAL	IFD 0	Fraction of the range where the sensor response stays linear; default 1.0.
`0xC633`	ShadowScale	RATIONAL	IFD 0	Scale for the shadows, for Adobe’s raw converter; default 1.0.
`0xC68F`	AsShotICCProfile	UNDEFINED	IFD 0	ICC profile for a camera that renders to an output space (“as shot”).
`0xC690`	AsShotPreProfileMatrix	SRATIONAL	IFD 0	Matrix applied before AsShotICCProfile.
`0xC691`	CurrentICCProfile	UNDEFINED	IFD 0	ICC profile for the current rendering.
`0xC692`	CurrentPreProfileMatrix	SRATIONAL	IFD 0	Matrix applied before CurrentICCProfile.
`0xC6BF`	ColorimetricReference	SHORT	IFD 0	0 scene-referred; 1 output-referred within the ICC range; 2 output-referred high dynamic range.
`0xC7A5`	BaselineExposureOffset	SRATIONAL	IFD 0	Adjusts BaselineExposure for a particular profile.
`0xC7A6`	DefaultBlackRender	LONG	IFD 0	0 auto, 1 none: whether a converter may apply its own black subtraction.
`0xCD3F`	RGBTables	UNDEFINED	IFD 0	Colour lookup tables applied as part of the profile.

Light sources

CalibrationIlluminant uses the Exif LightSource codes:

Code	Light	Code	Light
0	Unknown	15	White fluorescent (WW 3250–3800 K)
1	Daylight	16	Warm white fluorescent (L 2600–3250 K)
2	Fluorescent	17	Standard light A
3	Tungsten (incandescent)	18	Standard light B
4	Flash	19	Standard light C
9	Fine weather	20	D55
10	Cloudy	21	D65
11	Shade	22	D75
12	Daylight fluorescent (D 5700–7100 K)	23	D50
13	Day white fluorescent (N 4600–5500 K)	24	ISO studio tungsten
14	Cool white fluorescent (W 3800–4500 K)	255	Other (described by IlluminantData)

Camera profiles

Tag	Name	Type	IFD	Meaning
`0xC6F3`	CameraCalibrationSignature	ASCII or BYTE	IFD 0	Ties the camera calibration matrices to profiles made for them.
`0xC6F4`	ProfileCalibrationSignature	ASCII or BYTE	IFD 0	The calibration a profile was made for.
`0xC6F5`	ExtraCameraProfiles	LONG × n	IFD 0	Offsets of extra camera profiles, each a TIFF-like structure of these tags.
`0xC6F6`	AsShotProfileName	ASCII or BYTE	IFD 0	Profile to use by default.
`0xC6F8`	ProfileName	ASCII or BYTE	IFD 0	Name of the embedded profile.
`0xC6F9`	ProfileHueSatMapDims	LONG × 3	IFD 0	Hue, saturation and value divisions of the hue/saturation maps.
`0xC6FA`, `0xC6FB`, `0xCD39`	ProfileHueSatMapData1, 2, 3	FLOAT × 3n	IFD 0	Hue shift, saturation scale and value scale for each cell, per illuminant.
`0xC6FC`	ProfileToneCurve	FLOAT × 2n	IFD 0	Default tone curve as input, output pairs from 0.0 to 1.0.
`0xC6FD`	ProfileEmbedPolicy	LONG	IFD 0	0 allow copying, 1 embed if used, 2 never embed, 3 no restrictions.
`0xC6FE`	ProfileCopyright	ASCII or BYTE	IFD 0	Copyright of the profile.
`0xC725`	ProfileLookTableDims	LONG × 3	IFD 0	Divisions of the look table.
`0xC726`	ProfileLookTableData	FLOAT × 3n	IFD 0	Look table entries, as for the hue/saturation maps.
`0xC7A3`	ProfileHueSatMapEncoding	LONG	IFD 0	0 linear, 1 sRGB: how the value axis of the maps is divided.
`0xC7A4`	ProfileLookTableEncoding	LONG	IFD 0	0 linear, 1 sRGB, for the look table.
`0xCD2D`	ProfileGainTableMap	UNDEFINED	Raw	A spatially varying gain table for local tone mapping.
`0xCD40`	ProfileGainTableMap2	UNDEFINED	IFD 0	A later form of the gain table map.
`0xCD47`	ProfileDynamicRange	UNDEFINED	IFD 0	Whether the profile is for standard or high dynamic range output.
`0xCD48`	ProfileGroupName	ASCII	IFD 0	Groups profiles that belong together.

Previews, originals and digests

Tag	Name	Type	IFD	Meaning
`0xC65D`	RawDataUniqueID	BYTE × 16	IFD 0	Unique identifier of the raw data, the same across conversions.
`0xC68B`	OriginalRawFileName	ASCII or BYTE	IFD 0	Name of the raw file this DNG was made from.
`0xC68C`	OriginalRawFileData	UNDEFINED	IFD 0	The original raw file, compressed, embedded in the DNG.
`0xC71D`	OriginalRawFileDigest	BYTE × 16	IFD 0	MD5 digest of OriginalRawFileData.
`0xC71C`	RawImageDigest	BYTE × 16	IFD 0	MD5 digest of the raw image data.
`0xC7A7`	NewRawImageDigest	BYTE × 16	IFD 0	A digest computed in a newer way that does not depend on the storage layout.
`0xC716`	PreviewApplicationName	ASCII or BYTE	Preview	Program that rendered the preview.
`0xC717`	PreviewApplicationVersion	ASCII or BYTE	Preview	Its version.
`0xC718`	PreviewSettingsName	ASCII or BYTE	Preview	Name of the settings used.
`0xC719`	PreviewSettingsDigest	BYTE × 16	Preview	MD5 digest of those settings.
`0xC71A`	PreviewColorSpace	LONG	Preview	0 unknown, 1 grey gamma 2.2, 2 sRGB, 3 Adobe RGB, 4 ProPhoto RGB.
`0xC71B`	PreviewDateTime	ASCII	Preview	When the preview was rendered, as ISO 8601 text.
`0xC7A8`	RawToPreviewGain	DOUBLE	Preview	Gain between the raw data and the preview.
`0xC791`	OriginalDefaultFinalSize	SHORT or LONG × 2	IFD 0	Default final size of the original, before any downscaling.
`0xC792`	OriginalBestQualityFinalSize	SHORT or LONG × 2	IFD 0	Best quality final size of the original.
`0xC793`	OriginalDefaultCropSize	SHORT, LONG or RATIONAL × 2	IFD 0	Default crop size of the original.
`0xC7EE`	EnhanceParams	ASCII	Enhanced	Parameters of the processing that made an enhanced image.
`0xCD44`	ImageSequenceInfo	UNDEFINED	IFD 0	Place of this image in a sequence, such as a burst or bracket.
`0xCD46`	ImageStats	UNDEFINED	IFD 0	Statistics of the image data.
`0xCD49`	JXLDistance	FLOAT	Raw or preview	JPEG XL distance (quality) used.
`0xCD4A`	JXLEffort	LONG	Raw or preview	JPEG XL encoder effort, 1 low to 9 high.
`0xCD4B`	JXLDecodeSpeed	LONG	Raw or preview	JPEG XL decode speed setting, 1 slow to 4 fast.

Depth maps

Tag	Name	Type	IFD	Meaning
`0xC7E9`	DepthFormat	SHORT	IFD 0	0 unknown, 1 linear, 2 inverse: how depth values are coded.
`0xC7EA`	DepthNear	RATIONAL	IFD 0	Distance of the smallest value.
`0xC7EB`	DepthFar	RATIONAL	IFD 0	Distance of the largest value.
`0xC7EC`	DepthUnits	SHORT	IFD 0	0 unknown, 1 metres.
`0xC7ED`	DepthMeasureType	SHORT	IFD 0	0 unknown, 1 along the optical axis, 2 along the optical ray.

CinemaDNG

These tags come from CinemaDNG, the DNG-based format for frames of video:

Tag	Name	Type	Meaning
`0xC763`	TimeCodes	BYTE × 8n	SMPTE time codes of the frame
`0xC764`	FrameRate	SRATIONAL	Frames per second
`0xC772`	TStop	RATIONAL × 1 or 2	T-stop of the lens
`0xC789`	ReelName	ASCII	Name of the reel
`0xC7A1`	CameraLabel	ASCII	Label of the camera in a multi-camera shoot

Other users of this range

Some tags in the same number range are not part of DNG: 0xC640 (Canon CR2 slices), 0xC660 (Alias Sketchbook), 0xC6C5 (Canon sRAW type), 0xC6D2 and 0xC6D3 (Panasonic titles), 0xC7AA (Adobe cache version), 0xC7D5 (Nikon NEF info), 0xC7D7 and 0xC7D8 (ZIF). Readers should treat them as private. 0xCD41 holds JUMBF boxes (as used for content credentials); its exact status in the DNG specification is not confirmed here.

.DNG File Format – Tags