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Slicing images with Python and PIL

/ Published in: Python
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Create smaller tiles out of a larger bitmap image

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  1. def process_floor_image(infile, outfile, copy_pics):
  2.     """
  3.     Copy the orignal image and make also 1024 x 1024 sliced tiles out of it. 
  4.  
  5.     Because our green robot friend sucks.
  6.  
  7.     http://stackoverflow.com/questions/6632140/android-pixel-quality-reduction-in-images-loaded-in-webview    
  8.  
  9.     @return Image size in [width, height]
  10.     """
  11.  
  12.  
  13.     im = Image.open(infile)
  14.  
  15.     w = im.size[0]
  16.     h = im.size[1]
  17.     dimensions = [ w, h ]
  18.  
  19.     if copy_pics:
  20.  
  21.         # Copy master
  22.         path = os.path.dirname(outfile)
  23.         base = os.path.basename(outfile)
  24.  
  25.         try:
  26.             os.makedirs(path)
  27.         except OSError:
  28.             pass
  29.  
  30.         print "Copying image:" + outfile
  31.         shutil.copyfile(infile, outfile)
  32.  
  33.         # slice the image to 1000 x 1000 tiles
  34.         slice_size = 1000
  35.         for y in range(0, h, slice_size):
  36.             for x in range(0, w, slice_size):
  37.                 fname = os.path.join(path, "tile-%d-%d-%s" % (x, y, base)) 
  38.                 print "Creating tile:" + fname
  39.  
  40.                 mx = min(x+slice_size, w)
  41.                 my = min(y+slice_size, h)
  42.  
  43.                 buffer = Image.new("RGB", [slice_size, slice_size], (255, 255, 255))                                
  44.                 tile = im.crop((x, y, mx, my))
  45.                 buffer.paste(tile, (0, 0))                                
  46.                 buffer.save(fname, "PNG")
  47.  
  48.     return dimensions

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