# DNG Image Properties Metadata keys for the Digital Negative (DNG) archival format. ## Discussion For more information about the DNG format, see *Digital Negative (DNG) Specification* at [www.adobe.com](https://www.adobe.com). ## Topics ### Dictionary [`kCGImagePropertyDNGDictionary`](/documentation/ImageIO/kCGImagePropertyDNGDictionary) A dictionary of key-value pairs for an image that uses the Digital Negative (DNG) archival format. ### Quality [`kCGImagePropertyDNGBaselineSharpness`](/documentation/ImageIO/kCGImagePropertyDNGBaselineSharpness) The amount of sharpening required for this camera model. [`kCGImagePropertyDNGLinearResponseLimit`](/documentation/ImageIO/kCGImagePropertyDNGLinearResponseLimit) The fraction of the encoding range, above which the response may become significantly non-linear. [`kCGImagePropertyDNGChromaBlurRadius`](/documentation/ImageIO/kCGImagePropertyDNGChromaBlurRadius) A hint to the DNG reader about how much chroma blur to apply to the image. [`kCGImagePropertyDNGAntiAliasStrength`](/documentation/ImageIO/kCGImagePropertyDNGAntiAliasStrength) A hint to the DNG reader about how strong the camera’s antialias filter is. [`kCGImagePropertyDNGShadowScale`](/documentation/ImageIO/kCGImagePropertyDNGShadowScale) A tag that Adobe Camera Raw uses to control the sensitivity of its Shadows slider. [`kCGImagePropertyDNGBestQualityScale`](/documentation/ImageIO/kCGImagePropertyDNGBestQualityScale) The scale factor to apply to the default scale to achieve the best quality image size. [`kCGImagePropertyDNGDefaultScale`](/documentation/ImageIO/kCGImagePropertyDNGDefaultScale) The default scale factors for each direction to convert the image to square pixels. [`kCGImagePropertyDNGLinearizationTable`](/documentation/ImageIO/kCGImagePropertyDNGLinearizationTable) A lookup table that maps stored values into linear values. ### Exposure [`kCGImagePropertyDNGBaselineExposure`](/documentation/ImageIO/kCGImagePropertyDNGBaselineExposure) The amount by which to adjust the zero point of the exposure, specified in EV units. [`kCGImagePropertyDNGBaselineNoise`](/documentation/ImageIO/kCGImagePropertyDNGBaselineNoise) The relative noise level of the camera model at an ISO of 100. [`kCGImagePropertyDNGBaselineExposureOffset`](/documentation/ImageIO/kCGImagePropertyDNGBaselineExposureOffset) The amount of EV units to add to the baseline exposure during image rendering. ### Color Balance [`kCGImagePropertyDNGAnalogBalance`](/documentation/ImageIO/kCGImagePropertyDNGAnalogBalance) The analog or digital gain that applies to the stored raw values. [`kCGImagePropertyDNGAsShotNeutral`](/documentation/ImageIO/kCGImagePropertyDNGAsShotNeutral) The selected white balance at the time of capture, encoded as the coordinates of a neutral color in linear reference space values. [`kCGImagePropertyDNGAsShotWhiteXY`](/documentation/ImageIO/kCGImagePropertyDNGAsShotWhiteXY) The selected white balance at the time of capture, encoded as x-y chromaticity coordinates. [`kCGImagePropertyDNGBayerGreenSplit`](/documentation/ImageIO/kCGImagePropertyDNGBayerGreenSplit) A value that specifies how closely green pixels in the blue/green rows track the green pixels in red/green rows. [`kCGImagePropertyDNGForwardMatrix1`](/documentation/ImageIO/kCGImagePropertyDNGForwardMatrix1) A matrix that maps white balanced camera colors to XYZ D50 colors. [`kCGImagePropertyDNGForwardMatrix2`](/documentation/ImageIO/kCGImagePropertyDNGForwardMatrix2) A matrix that maps white balanced camera colors to XYZ D50 colors. [`kCGImagePropertyDNGDefaultBlackRender`](/documentation/ImageIO/kCGImagePropertyDNGDefaultBlackRender) A hint to the raw converter about how to handle the black point during rendering. ### Color Calibration [`kCGImagePropertyDNGBlackLevelRepeatDim`](/documentation/ImageIO/kCGImagePropertyDNGBlackLevelRepeatDim) The repeat pattern size for the black level tag. [`kCGImagePropertyDNGBlackLevel`](/documentation/ImageIO/kCGImagePropertyDNGBlackLevel) The zero light encoding level, specified as a repeating pattern. [`kCGImagePropertyDNGBlackLevelDeltaH`](/documentation/ImageIO/kCGImagePropertyDNGBlackLevelDeltaH) The difference between the zero-light encoding level for each column and the baseline zero-light encoding level. [`kCGImagePropertyDNGBlackLevelDeltaV`](/documentation/ImageIO/kCGImagePropertyDNGBlackLevelDeltaV) The difference between the zero-light encodoing level for each row and the baseline zero-light encoding level. [`kCGImagePropertyDNGWhiteLevel`](/documentation/ImageIO/kCGImagePropertyDNGWhiteLevel) The saturated encoding level for the raw sample values. [`kCGImagePropertyDNGCalibrationIlluminant1`](/documentation/ImageIO/kCGImagePropertyDNGCalibrationIlluminant1) The illuminant for the first set of color calibration tags. [`kCGImagePropertyDNGCalibrationIlluminant2`](/documentation/ImageIO/kCGImagePropertyDNGCalibrationIlluminant2) The illuminant for an optional second set of color calibration tags. [`kCGImagePropertyDNGColorMatrix1`](/documentation/ImageIO/kCGImagePropertyDNGColorMatrix1) A transformation matrix that converts XYZ values to reference camera native color spaces, under the first calibration illuminant. [`kCGImagePropertyDNGColorMatrix2`](/documentation/ImageIO/kCGImagePropertyDNGColorMatrix2) A transformation matrix that converts XYZ values to reference camera native color spaces, under the second calibration illuminant. [`kCGImagePropertyDNGCameraCalibration1`](/documentation/ImageIO/kCGImagePropertyDNGCameraCalibration1) A matrix that transforms reference camera native space values to camera-native space values under the first calibration illuminant. [`kCGImagePropertyDNGCameraCalibration2`](/documentation/ImageIO/kCGImagePropertyDNGCameraCalibration2) A matrix that transforms reference camera native space values to camera-native space values under the second calibration illuminant. [`kCGImagePropertyDNGReductionMatrix1`](/documentation/ImageIO/kCGImagePropertyDNGReductionMatrix1) A reduction matrix that converts color camera-native space values to XYZ values, under the first calibration illuminant. [`kCGImagePropertyDNGReductionMatrix2`](/documentation/ImageIO/kCGImagePropertyDNGReductionMatrix2) A reduction matrix that converts color camera-native space values to XYZ values, under the second calibration illuminant. [`kCGImagePropertyDNGAsShotICCProfile`](/documentation/ImageIO/kCGImagePropertyDNGAsShotICCProfile) A profile that specifies default color rendering from camera color-space coordinates into the ICC profile space. [`kCGImagePropertyDNGAsShotPreProfileMatrix`](/documentation/ImageIO/kCGImagePropertyDNGAsShotPreProfileMatrix) A matrix to apply to the camera color-space coordinates before processing values through the ICC profile. [`kCGImagePropertyDNGCurrentICCProfile`](/documentation/ImageIO/kCGImagePropertyDNGCurrentICCProfile) A profile that specifies default color rendering from camera color-space coordinates into the ICC profile space. [`kCGImagePropertyDNGCurrentPreProfileMatrix`](/documentation/ImageIO/kCGImagePropertyDNGCurrentPreProfileMatrix) A matrix to apply to the current camera color-space coordinates before processing values through the ICC profile. [`kCGImagePropertyDNGColorimetricReference`](/documentation/ImageIO/kCGImagePropertyDNGColorimetricReference) The colorimetric reference for the CIE XYZ values. [`kCGImagePropertyDNGCameraCalibrationSignature`](/documentation/ImageIO/kCGImagePropertyDNGCameraCalibrationSignature) A string to match against the profile calibration signature for the selected camera profile. [`kCGImagePropertyDNGProfileCalibrationSignature`](/documentation/ImageIO/kCGImagePropertyDNGProfileCalibrationSignature) A string that describes the calibration for the current profile. ### Crop Data [`kCGImagePropertyDNGActiveArea`](/documentation/ImageIO/kCGImagePropertyDNGActiveArea) The rectangle that defines the non-masked pixels of the sensor. [`kCGImagePropertyDNGMaskedAreas`](/documentation/ImageIO/kCGImagePropertyDNGMaskedAreas) A list of non-overlapping rectangles that contain fully masked pixels in the image. [`kCGImagePropertyDNGDefaultCropOrigin`](/documentation/ImageIO/kCGImagePropertyDNGDefaultCropOrigin) The origin of the final image area, relative to the top-left corner of the active area rectangle. [`kCGImagePropertyDNGDefaultCropSize`](/documentation/ImageIO/kCGImagePropertyDNGDefaultCropSize) The size of the final image area, in raw image coordinates. [`kCGImagePropertyDNGDefaultUserCrop`](/documentation/ImageIO/kCGImagePropertyDNGDefaultUserCrop) A default user-crop rectangle in relative coordinates. ### RAW Data [`kCGImagePropertyDNGOriginalRawFileName`](/documentation/ImageIO/kCGImagePropertyDNGOriginalRawFileName) The file name of the original raw file. [`kCGImagePropertyDNGOriginalRawFileData`](/documentation/ImageIO/kCGImagePropertyDNGOriginalRawFileData) The compressed contents of the original raw file. [`kCGImagePropertyDNGNoiseReductionApplied`](/documentation/ImageIO/kCGImagePropertyDNGNoiseReductionApplied) The amount of noise reduction applied to the raw data on a scale of 0.0 to 1.0. [`kCGImagePropertyDNGNewRawImageDigest`](/documentation/ImageIO/kCGImagePropertyDNGNewRawImageDigest) An MD5 digest of the raw image data. [`kCGImagePropertyDNGOriginalRawFileDigest`](/documentation/ImageIO/kCGImagePropertyDNGOriginalRawFileDigest) An MD5 digest of the data stored for the original raw file data. [`kCGImagePropertyDNGRawImageDigest`](/documentation/ImageIO/kCGImagePropertyDNGRawImageDigest) A modified MD5 digest of the raw image data. [`kCGImagePropertyDNGOriginalDefaultFinalSize`](/documentation/ImageIO/kCGImagePropertyDNGOriginalDefaultFinalSize) THe default final size of the larger original file that was the source of this proxy. [`kCGImagePropertyDNGOriginalBestQualityFinalSize`](/documentation/ImageIO/kCGImagePropertyDNGOriginalBestQualityFinalSize) The best-quality final size of the larger original file that was the source of this proxy. [`kCGImagePropertyDNGOriginalDefaultCropSize`](/documentation/ImageIO/kCGImagePropertyDNGOriginalDefaultCropSize) The default crop size of the larger original file that was the source of this proxy. [`kCGImagePropertyDNGRawToPreviewGain`](/documentation/ImageIO/kCGImagePropertyDNGRawToPreviewGain) The gain between the main raw IFD and the preview IFD that contains this tag. [`kCGImagePropertyDNGNoiseProfile`](/documentation/ImageIO/kCGImagePropertyDNGNoiseProfile) The amount of noise in the raw image. [`kCGImagePropertyDNGCFALayout`](/documentation/ImageIO/kCGImagePropertyDNGCFALayout) The spatial layout of the CFA. [`kCGImagePropertyDNGCFAPlaneColor`](/documentation/ImageIO/kCGImagePropertyDNGCFAPlaneColor) A mapping between the values in the CFA pattern tag and the plane numbers in linear raw space. [`kCGImagePropertyDNGOpcodeList1`](/documentation/ImageIO/kCGImagePropertyDNGOpcodeList1) The list of opcodes to apply to the raw image, as read directly from the file. [`kCGImagePropertyDNGOpcodeList2`](/documentation/ImageIO/kCGImagePropertyDNGOpcodeList2) THe list of opcodes to apply to the raw image, after mapping it to linear reference values. [`kCGImagePropertyDNGOpcodeList3`](/documentation/ImageIO/kCGImagePropertyDNGOpcodeList3) The list of opcodes to apply to the raw image, after demosaicing it. [`kCGImagePropertyDNGWarpRectilinear`](/documentation/ImageIO/kCGImagePropertyDNGWarpRectilinear) An opcode to apply a warp to an image to correct for geometric distortion and lateral chromatic aberration for rectilinear lenses. [`kCGImagePropertyDNGWarpFisheye`](/documentation/ImageIO/kCGImagePropertyDNGWarpFisheye) An opcode to unwrap an image captued with a fisheye lens and map it to a perspective projection. [`kCGImagePropertyDNGFixVignetteRadial`](/documentation/ImageIO/kCGImagePropertyDNGFixVignetteRadial) An opcode to apply a gain function to an image to correct vignetting. ### Image File Data [`kCGImagePropertyDNGPrivateData`](/documentation/ImageIO/kCGImagePropertyDNGPrivateData) Private data that manufacturers may store with an image and use in their own converters. [`kCGImagePropertyDNGMakerNoteSafety`](/documentation/ImageIO/kCGImagePropertyDNGMakerNoteSafety) A Boolean value that tells the DNG reader whether the EXIF MakerNote tag is safe to preserve. [`kCGImagePropertyDNGRawDataUniqueID`](/documentation/ImageIO/kCGImagePropertyDNGRawDataUniqueID) A 16-byte unique identifier for the raw image data. [`kCGImagePropertyDNGSubTileBlockSize`](/documentation/ImageIO/kCGImagePropertyDNGSubTileBlockSize) The size of rectangular blocks that tiles use to group pixels. [`kCGImagePropertyDNGRowInterleaveFactor`](/documentation/ImageIO/kCGImagePropertyDNGRowInterleaveFactor) The number of interleaved fields for the rows of the image. [`kCGImagePropertyDNGBackwardVersion`](/documentation/ImageIO/kCGImagePropertyDNGBackwardVersion) The oldest version for which a file is compatible. [`kCGImagePropertyDNGVersion`](/documentation/ImageIO/kCGImagePropertyDNGVersion) An encoding of the four-tier version number. ### Profile Data [`kCGImagePropertyDNGExtraCameraProfiles`](/documentation/ImageIO/kCGImagePropertyDNGExtraCameraProfiles) A list of file offsets to extra camera profiles. [`kCGImagePropertyDNGAsShotProfileName`](/documentation/ImageIO/kCGImagePropertyDNGAsShotProfileName) A string containing the name of the “as shot” camera profile, if any. [`kCGImagePropertyDNGProfileHueSatMapDims`](/documentation/ImageIO/kCGImagePropertyDNGProfileHueSatMapDims) The number of input samples in each dimension of the hue/saturation/value mapping tables. [`kCGImagePropertyDNGProfileHueSatMapData1`](/documentation/ImageIO/kCGImagePropertyDNGProfileHueSatMapData1) The data for the first hue/saturation/value mapping table. [`kCGImagePropertyDNGProfileHueSatMapData2`](/documentation/ImageIO/kCGImagePropertyDNGProfileHueSatMapData2) The data for the second hue/saturation/value mapping table. [`kCGImagePropertyDNGProfileHueSatMapEncoding`](/documentation/ImageIO/kCGImagePropertyDNGProfileHueSatMapEncoding) The encoding option to use when indexing into a 3D look table during raw conversion. [`kCGImagePropertyDNGProfileToneCurve`](/documentation/ImageIO/kCGImagePropertyDNGProfileToneCurve) The default tone curve to apply when processing the image as a starting point for user adjustments. [`kCGImagePropertyDNGProfileName`](/documentation/ImageIO/kCGImagePropertyDNGProfileName) A string containing the name of the camera profile. [`kCGImagePropertyDNGProfileEmbedPolicy`](/documentation/ImageIO/kCGImagePropertyDNGProfileEmbedPolicy) The usage rules for the camera profile. [`kCGImagePropertyDNGProfileCopyright`](/documentation/ImageIO/kCGImagePropertyDNGProfileCopyright) The copyright information for the camera profile. [`kCGImagePropertyDNGProfileLookTableDims`](/documentation/ImageIO/kCGImagePropertyDNGProfileLookTableDims) The number of input samples in each dimentsion of a default “look” table. [`kCGImagePropertyDNGProfileLookTableData`](/documentation/ImageIO/kCGImagePropertyDNGProfileLookTableData) The default “look” table to apply when processing the image as a starting point for user adjustment. [`kCGImagePropertyDNGProfileLookTableEncoding`](/documentation/ImageIO/kCGImagePropertyDNGProfileLookTableEncoding) The encoding option to use when indexing into a 3D look table during raw conversion. ### Preview [`kCGImagePropertyDNGPreviewApplicationName`](/documentation/ImageIO/kCGImagePropertyDNGPreviewApplicationName) The name of the app that created the preview stored in the IFD. [`kCGImagePropertyDNGPreviewApplicationVersion`](/documentation/ImageIO/kCGImagePropertyDNGPreviewApplicationVersion) The version number of the app that created the preview stored in the IFD. [`kCGImagePropertyDNGPreviewSettingsName`](/documentation/ImageIO/kCGImagePropertyDNGPreviewSettingsName) The name of the conversion settings for the preview. [`kCGImagePropertyDNGPreviewSettingsDigest`](/documentation/ImageIO/kCGImagePropertyDNGPreviewSettingsDigest) A unique ID of the conversion settings used to render the preview. [`kCGImagePropertyDNGPreviewColorSpace`](/documentation/ImageIO/kCGImagePropertyDNGPreviewColorSpace) The color space associated with the rendered preview. [`kCGImagePropertyDNGPreviewDateTime`](/documentation/ImageIO/kCGImagePropertyDNGPreviewDateTime) The date and time for the render of the preview. ### Camera Details [`kCGImagePropertyDNGLensInfo`](/documentation/ImageIO/kCGImagePropertyDNGLensInfo) Information about the lens used for the image. [`kCGImagePropertyDNGUniqueCameraModel`](/documentation/ImageIO/kCGImagePropertyDNGUniqueCameraModel) A unique, nonlocalized name for the camera model. [`kCGImagePropertyDNGLocalizedCameraModel`](/documentation/ImageIO/kCGImagePropertyDNGLocalizedCameraModel) The localized camera model name. [`kCGImagePropertyDNGCameraSerialNumber`](/documentation/ImageIO/kCGImagePropertyDNGCameraSerialNumber) The camera serial number. --- Copyright © 2026 Apple Inc. 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