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oyranos-cms / oyranos

Colour Management System
https://gitlab.com/oyranos/oyranos
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Improve CAT for big white point changes #37

Closed beku closed 6 years ago

beku commented 6 years ago

Currently a simple linear scale in CIE*Lab is done to create the white point adaption. This appears not to be sufficient for bigger white point changes, say from 6500 or 5000 Kelvin to 3000 Kelvin.

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beku commented 6 years ago

lcms2 provides cmsAdaptToIlluminant() with a Bradford matrix. Bradford is already a great improvement. ciecam02.c contains lots of code.

beku commented 6 years ago

Looks good with the latest commits.