al_color_rgb_to_linear - Allegro 5 API

       Convert gamma corrected sRGB values (i.e. normal RGB) to linear sRGB space.

       al_color_rgb_to_linear - Allegro 5 API

al_color_linear(3alleg5), al_color_linear_to_rgb(3alleg5)

Allegro reference manual                                                         al_color_rgb_to_linear(3alleg5)

       5.2.8

              #include <allegro5/allegro_color.h>

              void al_color_rgb_to_linear(float red, float green, float blue,
                 float *r, float *g, float *b)