Don't forget to invert colours

src/image.c

@@ -705,9 +705,9 @@ static void tile_copy_to_bitmap(cammy_image *dest,
                          channels,
                          x_dest,
                          y_dest,
-                         src->palette[v].r,
-                         src->palette[v].g,
-                         src->palette[v].b);
+                         src->palette[3-v].r,
+                         src->palette[3-v].g,
+                         src->palette[3-v].b);
         }
     }
 }