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add CMYK conversion matrices to colorspace-tools

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hunterk 2017-03-13 14:31:40 -05:00
parent 47e7583af8
commit a414020804
1 changed files with 32 additions and 9 deletions
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23
misc/colorspace-tools.h
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@ -134,6 +134,29 @@ vec3 XYZtoYxy(vec3 XYZ)
return XYZ; return XYZ;
} }
// RGB <-> CMYK conversions require 4 channels
vec4 RGBtoCMYK(vec3 RGB){
float Red = RGB.r;
float Green = RGB.g;
float Blue = RGB.b;
float Black = min(1.0 - Red, min(1.0 - Green, 1.0 - Blue));
float Cyan = (1.0 - Red - Black) / (1.0 - Black);
float Magenta = (1.0 - Green - Black) / (1.0 - Black);
float Yellow = (1.0 - Blue - Black) / (1.0 - Black);
return vec4(Cyan, Magenta, Yellow, Black);
}
vec3 CMYKtoRGB(vec4 CMYK){
float Cyan = CMYK.x;
float Magenta = CMYK.y;
float Yellow = CMYK.z;
float Black = CMYK.w;
float Red = 1.0 - min(1.0, Cyan * (1.0 - Black) + Black);
float Green = 1.0 - min(1.0, Magenta * (1.0 - Black) + Black);
float Blue = 1.0 - min(1.0, Yellow * (1.0 - Black) + Black);
return vec3(Red, Green, Blue);
}
// Converting pure hue to RGB // Converting pure hue to RGB
vec3 HUEtoRGB(float H) vec3 HUEtoRGB(float H)
{ {