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CyanSky · Guest

Hello,

i am looking for an algorithm to mix two CMYK-Colors.

Thats why, when i mix to RGB-Colors, i get not the real mixed Color
like in Paintings.

Example: mixing red and green gives yellow, not brown, like on
paintings.

For that i heared about, that the CMYK-Colors are better for
real-color mixing. But when i See the CMYK-Parts of red and green and
brown, i can't find a pattern or an algorithm to calculate with them.

Can anybody help me?

Regards
CyanSky

Willem Jongman · Guest

Hi,

RGB and CMYK are hardware-oriented color models,
aimed at CRT's resp. printers.
What you need is a color model that is oriented
to human perception, one of these is HSV (hue,
saturation, value).

Convert your two RGB colors to HSV, than just
average them:

H3 = (H1 + H2) / 2;
S3 = (S1 + S2) / 2;
V3 = (V1 + V2) / 2;

Convert the result back to RGB et voila.

The algorithms for doing the conversions are easy to
find on the web,
http://homepages.borland.com/efg2lab/Library/Delphi/Graphics/Color.htm
might be a good start, or google for rgb2hsv and hsv2rgb.

Good luck,
Willem.

CyanSky wrote: