ImageGear for C and C++ on Linux v18.8 - Updated
DCRAW Metadata Structure
| Name | Id | Type | Value Type | Value | Value Length | Read Only |
|---|---|---|---|---|---|---|
| "Common" | IGMDTAG_ID_DCRAW_COMMON | LEVEL_START | 0 | NULL | 0 | TRUE |
| "EXIF" | IG_FORMAT_EXIF_TIFF | LEVEL_START | 0 | NULL | 0 | TRUE |
| "TIFF" | IG_FORMAT_TIF | LEVEL_START | 0 | NULL | 0 | TRUE |
| "CIFF" | IG_FORMAT_CIFF | LEVEL_START | 0 | NULL | 0 | TRUE |
| "Statistics" | IGMDTAG_ID_DCRAW_STATISTICS | LEVEL_START | 0 | NULL | 0 | TRUE |
Common and Statistic levels are available for specific Camera Raw images only. Please see ImageGear Supported Digital Camera RAW Formats for a list of Camera Raw formats supported by ImageGear, which includes the availability of the metadata sections.
The Common sub-tree contains values that are common or useful for all raw files.
All values in the Common sub-tree have Type = VALUE_ITEM and are Read Only.
| Name | Id | Description |
|---|---|---|
| AsShotNeutral | IGMDTAG_ID_DCRAW_ASSHOTNEUTRAL | Specifies the selected white balance at time of capture, encoded as the coordinates of a perfectly neutral color in linear reference space values. |
| BaselineExposure | IGMDTAG_ID_DCRAW_BASELINEEXPOSURE | Specifies baseline exposure of the camera, in EV units. Application may use this value to adjust exposure compensation for particular camera model. |
| BitsPerSample | IGMDTAG_ID_DCRAW_BITSPERSAMPLE | Bits per sample in the original raw image (before reconstruction) |
| BlackLevelRepeatDim | IGMDTAG_ID_DCRAW_BLACKLEVELREPEATDIM | This tag specifies repeat pattern size for the "BlackLevel" tag. |
| CalibrationIlluminant1 | IGMDTAG_ID_DCRAW_CALIBRATIONILLUMINANT1 | The illuminant used for ColorMatrix1 color conversion matrix. Allowed values are the same as allowed values for LightSource EXIF tag (see Exif specification). |
| CalibrationIlluminant2 | IGMDTAG_ID_DCRAW_CALIBRATIONILLUMINANT1 | The illuminant used for ColorMatrix2 color conversion matrix. Allowed values are the same as allowed values for LightSource EXIF tag (see Exif specification). |
| CFAPattern | IGMDTAG_ID_DCRAW_CFAPATTERN | This tag encodes the actual color filter array geometric pattern of the image sensor used to capture the single sensor color image. |
| CFARepeatPatternDim | IGMDTAG_ID_DCRAW_CFAREPEATPATTERNDIM | This tag encodes the number of pixels horizontally and vertically that are needed to uniquely define the repeat pattern of the color filter array. |
| ColorMatrix1 | IGMDTAG_ID_DCRAW_COLORMATRIX1 | Conversion matrix from XYZ to camera color space, for illuminant specified by CalibrationIlluminant1 tag. Matrix is stored in row scan order. |
| ColorMatrix2 | IGMDTAG_ID_DCRAW_COLORMATRIX2 | Conversion matrix from XYZ to camera color space, for illuminant specified by CalibrationIlluminant2 tag. Matrix is stored in row scan order. |
| ColorPlanes | IGMDTAG_ID_DCRAW_COLORPLANES | Number of colors in the CFA pattern |
| ImageHeight | IGMDTAG_ID_DCRAW_IMAGEHEIGHT | Image height after that masked pixels were trimmed out |
| ImageWidth | IGMDTAG_ID_DCRAW_IMAGEWIDTH | Image width after that masked pixels were trimmed out |
| Make | IGMDTAG_ID_DCRAW_MAKE | Name of the camera manufacturer |
| Model | IGMDTAG_ID_DCRAW_MODEL | Name of the camera model |
| PhotometricInterpretation | IGMDTAG_ID_DCRAW_PHOTOMETRICINTERPRETATION | TIF_PHOTO_CFA, TIF_PHOTO_RGB |
| RawHeight | IGMDTAG_ID_DCRAW_RAWHEIGHT | Raw Image Height, including masked pixels |
| RawLeft | IGMDTAG_ID_DCRAW_RAWLEFT | X coordinate of first column of non-masked pixels |
| RawTop | IGMDTAG_ID_DCRAW_RAWTOP | Y coordinate of first row of non-masked pixels |
| RawWidth | IGMDTAG_ID_DCRAW_RAWWIDTH | Raw Image Width, including masked pixels |
| SamplesPerPixel | IGMDTAG_ID_DCRAW_SAMPLESPERPIXEL | Number of samples per pixel in the original image, before reconstruction |
| TimeStamp | IGMDTAG_ID_DCRAW_TIMESTAMP | Time stamp |
| UniqueCameraModel | IGMDTAG_ID_DCRAW_UNIQUECAMERAMODEL | Unique, non-localized name for the camera model that created the image in the raw file. |
| WhiteLevel | IGMDTAG_ID_DCRAW_WHITELEVEL | Image pixel value that corresponds to fully saturated encoding Level. |
This Level includes format-specific metadata that is found in the image (EXIF, TIFF or CIFF). See corresponding sections for structure of metadata for these formats.
This section contains data which is collected during image loading, rather than obtained from image's header or metadata. Only image loading functions, such as IG_fltr_load_file, generate this section. Header reading functions, such as IG_info_get, do not generate it.
For some cameras ImageGear uses predefined values for BlackLevel, so they are not calculated from pixel data. In this case, ImageGear also places BlackLevel tag to Statistics section, rather than in Common section, for uniformity reasons.
The following tags can be present in the Statistics section:
| Name | Id | Description |
|---|---|---|
| BlackLevelRepeatDim | IGMDTAG_ID_DCRAW_BLACKLEVELREPEATDIM | This tag specifies repeat pattern size for the "BlackLevel" tag. |
| BlackLevel | IGMDTAG_ID_DCRAW_BLACKLEVEL | This tag specifies the zero light (a.k.a. thermal black or black current) encoding Level. It is calculated during image loading by averaging pixel values in the masked areas of the image. |