Hi,
Is there a way to convert CMYK data to CMY and back without losing
information?
I tried using the 2 formulas:
CMYK->CMY: C' = C(1-K)+k
CMY->CMYK: C = (C-K)/(1-K) where K = min (C, M,Y)
However this changes the amount of black in some cases and I get really
dark colors, so something is wrong.
Is there a way to do it considering the CMYK profile of the data?
Perhaps there's a tag in the profile which tells me how to obtain the
black value from the 3 CMY values? If not, can I take a given CMYK
profile and convert it to a CMY profile which will represent the same
device?
Basically, what I want to do is composite CMYK data using a GPU which
supports 3 color channels. I also don't want to do thing in 2 passes
(eg: CM and YK separately).
Any help would be greatly appreciated.
Yaron
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