Add gamma support to ply-image.

src/ply-image.c

 /* ply-image.c - png file loader
  *
  * Copyright (C) 2006, 2007 Red Hat, Inc.
  * Copyright (C) 2003 University of Southern California
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2, or (at your option)
  * any later version.
  *
@@ skipping 433 matching lines @@
   if (!ply_image_load (image))
     {
       exit_code = errno;
       perror (path);
       exit (exit_code);
     }
   return image;
 }
 
 #include "ply-frame-buffer.h"
+#include "ply-gamma.h"
 
 #include <math.h>
 #include <signal.h>
 #include <stdio.h>
 #include <sys/ioctl.h>
 #include <sys/time.h>
 #include <values.h>
 
 #include <linux/kd.h>
 
@@ skipping 91 matching lines @@
 
   buffer = ply_frame_buffer_new (NULL);
 
   if (!ply_frame_buffer_open (buffer))
     {
       exit_code = errno;
       perror ("could not open framebuffer");
       return exit_code;
     }
 
+  ply_gamma_set();
+
   if (clear)
     {
       ply_frame_buffer_clear (buffer);
     }
   else
     {
       /*
        * Display main image.
        */
       ply_frame_buffer_show_file_at_xy (buffer, argv[1], 0, 0);
@@ skipping 57 matching lines @@
             }
         }
     }
 
   // Skip these to save time.
   // ply_frame_buffer_close (buffer);
   // ply_frame_buffer_free (buffer);
 
   return exit_code;
 }