diff --git a/gba/tools/img2bin.py b/gba/tools/img2bin.py
index 3ebd927..1fd95a2 100644
--- a/gba/tools/img2bin.py
+++ b/gba/tools/img2bin.py
@@ -12,8 +12,14 @@ def split_seq(seq, splitsize):
   while seq:
     newseq.append(seq[:splitsize])
     seq = seq[splitsize:]
-  return newseq      
+  return newseq
 
+def write_block(f, image, width=8, height=8, offset_x=0, offset_y=0):
+  for y in range(height):
+    for x in range(width):
+      val = image.getpixel((x+offset_x, y+offset_y)) 
+      f.write(chr(val))
+  
 if __name__=="__main__":
 
   tiled, args = gnu_getopt(sys.argv[1:], "t")
@@ -28,10 +34,7 @@ if __name__=="__main__":
   width, height = im.size
   print "Converting %dx%d image to binary." % (width, height)
   if not tiled:
-    for y in range(height):
-      for x in range(width):
-        val = im.getpixel((x, y)) 
-        output.write(chr(val))
+    write_block(output, im, width, height)
   else:
     print "Doing 1D tile conversion."
     if (width % 8) or (height % 8):
@@ -40,10 +43,7 @@ if __name__=="__main__":
     else:
       for offset_y in map(lambda n : 8*n, range(height / 8)):
         for offset_x in map(lambda n : 8*n, range(width / 8)):
-          for y in range(8):
-            for x in range(8):
-              val = im.getpixel((x+offset_x, y+offset_y)) 
-              output.write(chr(val))
+          write_block(output, im, offset_x=offset_x, offset_y=offset_y)
 
   if len(args) > 2:
     pal_output = open(args[2], "wb")