Pascal de Bruijn wrote:
I'm trying to create an ICC profile which imitates to color transformation done by my camera.
I'm not sure what you mean by that. Do you mean you are trying to profile your camera ?
So I photographed an IT8 target, in RAW+JPG mode. Then I developed the raw with UFRaw,
Note that any "development" through a raw converted needs to be kept constant for the profile to remain valid.
and converted to JPG to TIF with GIMP: scanin -p -v -dipn -o IMG_4438_JPG.tif it8.cht
This merely gets the RGB values from the image. I'm not sure why you are doing this given that the next command does the same thing as part of assembling a .ti3 file.
scanin -p -v -dipn IMG_4438.tif it8.cht IMG_4438_JPG.val
This won't work. You need to provide the IT8 CIE reference values, the values measured from your IT8 chart with an instrument either by yourself, or provided by the manufacturer of the IT8 chart. A profile provides a model of a devices color behaviour, connecting the device values with the device independent CIE standard observer values. For an input device this means that two sets of information are needed for each patch, one being the CIE values for the patch, and the other being the device RGB values. scanin retrieves the latter from the raster file, and combines them with the CIE values you have to provide. The RGB values you have extracted from the raster file is not a source of these values. Graeme Gill.