getr, getg, getb, geta - Extract a color component from the current pixel format. Allegro game

       Given a color in the format being used by the current video mode, these functions extract one of the red,
       green, blue, or alpha components (ranging 0-255), calling the preceding 8, 15,  16,  24,  or  32-bit  get
       functions as appropriate. The alpha part is only meaningful for 32-bit pixels. Example:

          int r, g, b, color_value;

          color_value = getpixel(screen, 100, 100);
          r = getr(color_value);
          g = getg(color_value);
          b = getb(color_value);

       getr,  getg,  getb,  geta  -  Extract  a  color  component  from  the  current pixel format. Allegro game
       programming library.

getr8(3alleg4), getr_depth(3alleg4), makecol(3alleg4), set_color_depth(3alleg4), exalpha(3alleg4)

Allegro                                           version 4.4.3                                    getr(3alleg4)

#include<allegro.h>intgetr(intc);intgetg(intc);intgetb(intc);intgeta(intc);