DOKK / manpages / debian 10 / allegro5-doc / al_color_rgb_to_hsv.3alleg5.en
al_color_rgb_to_hsv(3alleg5) al_color_rgb_to_hsv(3alleg5)

al_color_rgb_to_hsv - Allegro 5 API

#include <allegro5/allegro_color.h>
void al_color_rgb_to_hsv(float red, float green, float blue,
   float *hue, float *saturation, float *value)
    

Given an RGB triplet with components in the range 0..1, return the hue in degrees from 0..360 and saturation and value in the range 0..1.

al_color_hsv_to_rgb(3alleg5), al_color_hsv(3alleg5)

Allegro reference manual