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al_color_rgb_to_cmyk(3)                                al_color_rgb_to_cmyk(3)

NAME
       al_color_rgb_to_cmyk - Allegro 5 API

SYNOPSIS

              #include <allegro5/allegro_color.h>

              void al_color_rgb_to_cmyk(float red, float green, float blue,
                 float *cyan, float *magenta, float *yellow, float *key)

DESCRIPTION
       Each RGB color can be represented in CMYK with a K component of 0 with
       the following formula:

              C = 1 - R
              M = 1 - G
              Y = 1 - B
              K = 0

       This function will instead find the representation with the maximal
       value for K and minimal color components.

SEE ALSO
       al_color_cmyk(3), al_color_cmyk_to_rgb(3)

Allegro reference manual                               al_color_rgb_to_cmyk(3)