al_color_rgb_to_lab - Allegro 5 API

       Convert RGB values to L*a*b* color space.

       al_color_rgb_to_lab - Allegro 5 API

al_color_lab(3alleg5), al_color_lab_to_rgb(3alleg5)

Allegro reference manual                                                            al_color_rgb_to_lab(3alleg5)

       5.2.3

              #include <allegro5/allegro_color.h>

              void al_color_rgb_to_lab(float red, float green, float blue,
                 float *l, float *a, float *b)