[Lcms-user] Black Point Compensation

[Andrei S. <And...@dd...>]

Hello Everyone,

   I guess this is more a color question than littleCms.  Regardless, I'm
trying to understand the effects of black point comp on color "correctness"
for in gamut colors.  Tried to come to a conclusion with test, but I get
mixed results.  

   The scenario is this.  Rgb image has in gamut corporate logo and a photo
with both in and out of gamut colors.  I apply relative colorimetric
transform with BPC and the photo improves with a great reduction in
clipping.  However, the logo has now shifted as well and I can't say it's
less or more accurate.  Meaning, is some test cases the deltaE with BPC was
larger and in others smaller.

 

   Perhaps my tests are flawed.  Tradition ICC, not device-link.  So, would
the science of color suggest BPC would hurt "color accuracy" when applying
the relative intent?

 

Thanks,

Andrei