[Lcms-user] CMYK to CieLab

[Harald W. <hv...@gm...>]

Hi

I have been trying all day to convert CMYK to Lab using the basic.

hTransform = cmsCreateTransform(
hCMYKProfile,
TYPE_CMYK_DBL,
 hLab,
TYPE_Lab_DBL,
INTENT_PERCEPTUAL,
0);


I have also tried icctrans which gives the same results

echo 10 90 0 10 | icctrans  -i"CoatedFOGRA39.icc" -o*Lab -n

LittleCMS ColorSpace conversion calculator - v3.3

47.4525 63.8438 -7.7734


If I also just use a simple CMYK to RGB

echo 0 100 0 0 | icctrans  -i"CoatedFOGRA39.icc" -o*sRGB -n

LittleCMS ColorSpace conversion calculator - v3.3

229.56 0.00 125.60

This is all VERY different to all other calculations I have seem for
example I would think
RGB would be closer to
255 0 255

also checking many online converters

Am I doing something very wrong, I have tried other CMYK profiles like
USWebCoatedSWOP and they are nearly the same..

Harald