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color_to_cmyk.gml
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color_to_cmyk.gml
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#define color_to_cmyk
/// color_to_cmyk(color [, channel])
//
// Returns a list data structure populated by CMYK values of a color,
// or optionally, the value of a specific color channel.
//
// color RGB color, real
// channel channel to return, "C", "M", "Y", "K", string (optional)
//
/// GMLscripts.com/license
{
var C,M,Y,K,cmyk;
C = 1 - color_get_red(argument0) / 255;
M = 1 - color_get_green(argument0) / 255;
Y = 1 - color_get_blue(argument0) / 255;
K = min(C,M,Y,1);
if (K == 1) {
C = 0;
M = 0;
Y = 0;
}else{
C = (C - K) / (1 - K);
M = (M - K) / (1 - K);
Y = (Y - K) / (1 - K);
}
switch (argument1) {
case "C": return C;
case "M": return M;
case "Y": return Y;
case "K": return K;
}
cmyk = ds_list_create();
ds_list_add(cmyk, C);
ds_list_add(cmyk, M);
ds_list_add(cmyk, Y);
ds_list_add(cmyk, K);
return cmyk;
}