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POPIL - Convert GIF Frames to JPG
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copied!<p>I tried to convert an gif to single images with Python Image Library, but it results in weird frames</p> <p>The Input gif is:</p> <p><a href="http://longcat.de/gif_example.gif">Source Image http://longcat.de/gif_example.gif</a></p> <p>In my first try, i tried to convert the image with Image.new to an RGB image, with 255,255,255 as white background - like in any other example i've found on the internet:</p> <pre><code>def processImage( infile ): try: im = Image.open( infile ) except IOError: print "Cant load", infile sys.exit(1) i = 0 try: while 1: background = Image.new("RGB", im.size, (255, 255, 255)) background.paste(im) background.save('foo'+str(i)+'.jpg', 'JPEG', quality=80) i += 1 im.seek( im.tell() + 1 ) except EOFError: pass # end of sequence </code></pre> <p>but it results in weird output files:</p> <p><a href="http://longcat.de/gif_example1.jpg">Example #1 http://longcat.de/gif_example1.jpg</a></p> <p>My second try was, to convert the gif in an RGBA first, and then use its transparency mask, to make the transparent pieces white:</p> <pre><code>def processImage( infile ): try: im = Image.open( infile ) except IOError: print "Cant load", infile sys.exit(1) i = 0 try: while 1: im2 = im.convert('RGBA') im2.load() background = Image.new("RGB", im2.size, (255, 255, 255)) background.paste(im2, mask = im2.split()[3] ) background.save('foo'+str(i)+'.jpg', 'JPEG', quality=80) i += 1 im.seek( im.tell() + 1 ) except EOFError: pass # end of sequence </code></pre> <p>which results in an output like this:</p> <p><a href="http://longcat.de/gif_example2.jpg">Example #2 http://longcat.de/gif_example2.jpg</a></p> <p>The advantage over the first try was, that the first frame looks pretty good But as you can see, the rest is broken</p> <p>What should i try next?</p> <p>Edit:</p> <p>I think i came a lot closer to the solution</p> <p><a href="http://longcat.de/gif_example3.png">Example #3 http://longcat.de/gif_example3.png</a></p> <p>I had to use the palette of the first image for the other images, and merge it with the previous frame (for gif animations which use diff-images)</p> <pre><code>def processImage( infile ): try: im = Image.open( infile ) except IOError: print "Cant load", infile sys.exit(1) i = 0 size = im.size lastframe = im.convert('RGBA') mypalette = im.getpalette() try: while 1: im2 = im.copy() im2.putpalette( mypalette ) background = Image.new("RGB", size, (255,255,255)) background.paste( lastframe ) background.paste( im2 ) background.save('foo'+str(i)+'.png', 'PNG', quality=80) lastframe = background i += 1 im.seek( im.tell() + 1 ) except EOFError: pass # end of sequence </code></pre> <p>But i actually dont know, why my transparency is black, instead of white Even if i modify the palette (change the transparency channel to white) or use the transparency mask, the background is still black</p>

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