al_color_rgb_to_cmyk (3alleg5)

• #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)
  
  

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.

al_color_cmyk(3alleg5), al_color_cmyk_to_rgb(3alleg5)