# [argyllcms] Obtaining a camera color response matrix

*From*: Nikolai Tasev <nikolai@xxxxxxx>
*To*: argyllcms@xxxxxxxxxxxxx
*Date*: Tue, 10 Mar 2015 17:10:29 +0200

I have an industrial camera that accepts a color transformation matrix.

`It is a 3x3 matrix plus offset parameters. For example R' = R*m00 +
``G*m01 + B*m02 + offset1 and so on.
`

`The manufacturer states that this matrix is designed to give more
``accurate color response on different illuminants.
``I presume that this means that I should find the closest matrix that
``converts from the RGB raw values to RGB values in sRGB.
`Do you think this is a correct assumption?

`Is there a way to calculate such a matrix with argyll? Here is my
``approximate idea:
` - calibrate the camera in the intended lighting conditions
- take a shot of a calibration target
- measure the values with scanin
- create an input profile with colprof ( matrix only )
- look inside the icm file and find the matrix RGBraw to XYZ
- multiply it by the matrix XYZ to sRGB
- zero the offets
Do you think there is another way to do it or if I am missing some details?

`What use case should require offsets that are different than zero and
``how to change the calculations?
`
Best Regards
Nikolai Tasev

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