1al_color_rgb_to_cmyk(3)    Library Functions Manual    al_color_rgb_to_cmyk(3)
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NAME

6       al_color_rgb_to_cmyk
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SYNOPSIS

9              #include <allegro5/allegro_color.h>
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11              void al_color_rgb_to_cmyk(float red, float green, float blue,
12                 float *cyan, float *magenta, float *yellow, float *key)
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DESCRIPTION

15       Each  RGB color can be represented in CMYK with a K component of 0 with
16       the following formula:
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18              C = 1 - R
19              M = 1 - G
20              Y = 1 - B
21              K = 0
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23       This function will instead find the  representation  with  the  maximal
24       value for K and minimal color components.
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SEE ALSO

27       al_color_cmyk(3), al_color_cmyk_to_rgb(3)
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31Allegro reference manual                               al_color_rgb_to_cmyk(3)