luigi scarso wrote: > On 2/2/07, Peter Rolf <[EMAIL PROTECTED]> wrote: >> Hi all, >> >> I have some questions about cmyk in combination with Metapost. Just by using >> >> \setupcolors[state=start, >> cmyk=yes, >> mpcmyk=yes, >> rgb=no, >> ] >> >> I get cmy(k=0) graphics, although all used colors are still defined in >> the rgb color space. >> This is really a nice feature and the automatic color conversion works >> relative good. Only (so far I have seen) gray tones have a noticeable >> tendency to brown (Acroreader 7.09). I have tested one of those gray >> tones by defining it as cmyk and the result looks ok. >> >> RGB(223,223,227) >> CMY(0.12548, 0.12547, 0.10980) >> CMYK(0.01762, 0.01760, 0, 0.10980) >> >> So is there a way to get cymk instead of cmy? >> > hmm, > can you post an example ? > Mojca has pointed me to the definition of
\convertRGBtoCMYK (colo-ini.tex) and (if I understand it right) this is only a RGB->CMY conversion. The algorithm for the missing CMY->CMYK conversion is simple (see http://www.easyrgb.com/math.php?MATH=M13#text13 ), but "exact" calculation in TeX is no fun at all (at least not for me). I have tried to implement it, but yet without success. In the worst case I have to wait for luatex, which will solve all calculation problems. So think twice, before you waste your time... ;) Maybe I should add this color conversion to the feature request list, so that it will not be forgotten? Peter > luigi > _______________________________________________ > ntg-context mailing list > ntg-context@ntg.nl > http://www.ntg.nl/mailman/listinfo/ntg-context > _______________________________________________ ntg-context mailing list ntg-context@ntg.nl http://www.ntg.nl/mailman/listinfo/ntg-context
