save_bitmap - Saves a bitmap into any supported file format. Allegro game programming library.

       Writes a bitmap into a file, using the specified palette, which should be an array of 256 RGB structures.
       The  output  format is determined from the filename extension: at present this function supports BMP, PCX
       and TGA formats.

       Two things to watch out for: on some video cards it may be faster to copy the screen to a  memory  bitmap
       and save the latter, and if you use this to dump the screen into a file you may end up with an image much
       larger  than  you  were  expecting, because Allegro often creates virtual screens larger than the visible
       screen. You can get around this by using a sub-bitmap to specify which part of the screen to save, eg:

          BITMAP *bmp;
          PALETTE pal;
          ...
          get_palette(pal);
          bmp = create_sub_bitmap(screen, 0, 0, SCREEN_W, SCREEN_H);
          save_bitmap("dump.pcx", bmp, pal);
          destroy_bitmap(bmp);

       save_bitmap - Saves a bitmap into any supported file format. Allegro game programming library.

       Returns non-zero on error.

save_bmp(3alleg4),          save_pcx(3alleg4),          save_tga(3alleg4),          load_bitmap(3alleg4),
       register_bitmap_file_type(3alleg4)

Allegro                                           version 4.4.3                             save_bitmap(3alleg4)

#include<allegro.h>intsave_bitmap(constchar*filename,BITMAP*bmp,constRGB*pal);