set_luminance_blender - Enables a luminance blender mode. Allegro game programming library.

       Enables a luminance blender mode for combining translucent or lit truecolor pixels. Applies the luminance
       of the source to the destination.  The colour of the destination is not affected.

       set_luminance_blender - Enables a luminance blender mode. Allegro game programming library.

set_trans_blender(3alleg4), drawing_mode(3alleg4)

Allegro                                           version 4.4.3                   set_luminance_blender(3alleg4)

#include<allegro.h>voidset_luminance_blender(intr,intg,intb,inta);