makecol15_dither - Man Page

#include <allegro.h>

int makecol15_dither(int r, int g, int b, int x, int y);

int makecol16_dither(int r, int g, int b, int x, int y);

Given both a color value and a pixel coordinate, calculate a dithered 15  or 16-bit RGB value. This can produce better results when reducing images  from truecolor to hicolor. In addition to calling these functions  directly, hicolor dithering can be automatically enabled when loading  graphics by calling the set_color_conversion() function, for example  set_color_conversion(COLORCONV_REDUCE_TRUE_TO_HI | COLORCONV_DITHER).

Example:

   int pixel1, pixel2;
   
   /* The following two color values MAY be different. */
   pixel1 = makecol16_dither(255, 192, 64, 0, 0);
   pixel2 = makecol16_dither(255, 192, 64, 1, 0);

Returns the RGB value dithered for the specified coordinate.

makecol(3), makecol8(3), set_color_conversion(3)

makecol(3), makecol8(3), makecol_depth(3), set_color_conversion(3).

The man page makecol16_dither(3) is an alias of makecol15_dither(3).