RawSpeed Camera Definition File
The camera definition file is used for decoding images which doesn’t require any code changes. This enables us to add support for cameras which where not yet released when the code was written.
<Camera make="Panasonic" model="DMC-FZ45" mode="4:3" supported="yes" decoder_version="0">
<CFA width="2" height="2">
<Color x="0" y="0">GREEN</Color><Color x="1" y="0">BLUE</Color>
<Color x="0" y="1">RED</Color><Color x="1" y="1">GREEN</Color>
</CFA>
<Crop x="0" y="0" width="-58" height="-10"/>
<Sensor black="150" white="4097" iso_min="0" iso_max="0"/>
<BlackAreas>
<Vertical x="0" width="60"/>
<Horizontal y="2" height="46"/>
</BlackAreas>
<Hints>
<Hint name="coolpixsplit" value=""/>
</Hints>
<Aliases>
<Alias>DMC-FZ40</Alias>
</Aliases>
</Camera>
Let’s go through it line for line:
Camera Name
<Camera make="Panasonic" model="DMC-FZ45" mode="4:3" supported="yes" decoder_version="0">
This the basic camera identification. In this the make and model are required. This must be exactly as specified in the EXIF data of the file.
Mode refers to specific decoder modes which are special for each manufacturer. For cameras with specific modes there is usually a default (no mode specified) and some for non-default operation. For Canon for instance mode refers to “sRaw1” and “sRaw2”. For Panasonic it refers to cropping modes, since they require different cropping of the output image.
The supported tag specifies whether a camera is supported. If this tag isn’t added it is assumed to be supported.
The decoder_version is a possibility to disable decoding, if the decoder version is too old to properly decode the images from this camera. If the code version of RawSpeed is too old to decode this camera type, it will refuse to do so. If this isn’t specified it is assumed that all older versions of RawSpeed can decode the image.
CFA Colors
<CFA width="2" height="2">
<Color x="0" y="0">GREEN</Color><Color x="1" y="0">BLUE</Color>
<Color x="0" y="1">RED</Color><Color x="1" y="1">GREEN</Color>
</CFA>
This refers to the color layout of the sensor. This is the position at of the colors on the uncropped image, so it will be the same no matter what crop you specify. Currently only 2×2 CFA patterns are possible.
Image Cropping
<Crop x="0" y="0" width="-58" height="-10"/>
This is the cropping to be applied to the image. x & y are specified relative to the top-left of the image and is specified in pixels. Width & Height can be a number which is the desired output size in pixels. A negative number for width or height specifies a number of pixels that must be cropped from the bottom/right side of the image.
Sensor Info
<Sensor black="150" white="4097" iso_min="0" iso_max="0"/>
This tag can be added more than 1 time, but at least 1 must be present.
This specifies the black and white levels of images captured. Black and white must be specified. On cameras (some Nikons for instance) and files (DNG images) where this can be read from the image files themselves this is overridden.
The iso_min and iso_max are optional which indicates an ISO range where this must be applied. If both are set to 0, or left undefined they act as default values for all ISO values. Note that not all cameras may decode the ISO value.
Both ISO values are inclusive, so specify ranges so they don’t overlap (0->399, 400->799, etc). If different entry ranges overlap the first match will be used.
For backward compatibility, leave the default value as the last entry.
Sensor Black Areas
<BlackAreas>
<Vertical x="0" width="60"/>
<Horizontal y="2" height="46"/>
</BlackAreas>
This entry specifies one or more “black” areas on the sensor. This is areas where the sensor receives no light and it can therefore be used to accurately determine the black level of each image. The areas can be described as a vertical area starting a fixed number of pixels from the left and having a fixed width, or a horizontal, starting a fixed number of pixels down and having a fixed height.
All the areas are summed up in a histogram for each color component, and the median value is selected as the black value. This should ensure that noise and minor differences in hardware shouldn’t influence the calculations.
If any black areas are defined it will override any “black” value set in the Sensor definition.
Decoder Hints
<Hints>
<Hint name="coolpixsplit" value=""/>
</Hints>
This may contain manufacturer-specific hints for decoding. This can result in the code taking a specific decoder path, or otherwise treat the image differently. This is mainly used when it isn’t possible to determine which way to decode the image directly from the image data.
Camera Model Aliases
<Aliases>
<Alias>DMC-FZ40</Alias>
</Aliases>
This is a possibility to add one or more model aliases for a camera, which may have different model names in different regions.
2 responses to “RawSpeed Camera Definition File”
Leave a Reply to Roman Melihhov
[…] This file describes basic information about different cameras, so new cameras can be supported without code changes. See the separate documentation on the Camera Definition File. […]
I can’t add several lenses to one camera, that be K-5. And why if I choose lens for the camera rawstudio apply exif info like focal length and aperture that is vitable for TCA and vignetting settings from lensfun library.
What I see if focal -1mm and aperture f/-1.0.
lensfun-0.2.5-8.fc17.x86_64
Rawstudio 2.0 – rawstudio-2.0-4.fc17.x86_64