Python: Converting GIF frames to PNG

Question

I'm very new to python, trying to use it to split the frames of a GIF into PNG images.

# Using this GIF: http://www.videogamesprites.net/FinalFantasy1/Party/Before/Fighter-Front.gif

from PIL import Image

im = Image.open('Fighter-Front.gif')
transparency = im.info['transparency'] 
im.save('test1.png', transparency=transparency)

im.seek(im.tell()+1)
transparency = im.info['transparency'] 
im.save('test2.png', transparency=transparency)

# First frame comes out perfect, second frame (test2.png) comes out black,
# but in the "right shape", i.e. 
# https://i.stack.imgur.com/5GvzC.png

Is this specific to the image I'm working with or am I doing something wrong?

Thanks!

score 18 · Accepted Answer · answered Feb 05 '11 at 04:51

I don't think you're doing anything wrong. See a similar issue here: animated GIF problem. It appears as if the palette information isn't correctly treated for later frames. The following works for me:

def iter_frames(im):
    try:
        i= 0
        while 1:
            im.seek(i)
            imframe = im.copy()
            if i == 0: 
                palette = imframe.getpalette()
            else:
                imframe.putpalette(palette)
            yield imframe
            i += 1
    except EOFError:
        pass

for i, frame in enumerate(iter_frames(im)):
    frame.save('test%d.png' % i,**frame.info)

score 6 · Answer 2 · edited Oct 12 '12 at 03:06

6

I've fixed this bug here https://code.launchpad.net/~asdfghjkl-deactivatedaccount1/python-imaging/gif-fix.

DSM's answer won't work if the GIF uses local color tables.

edited Oct 12 '12 at 03:06

Mu Mind

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answered Apr 29 '11 at 20:14

Peter Le Bek

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1

Indeed, replacing the palette like is being done in the accepted answer is a very wrong thing to do. But, without needing to apply a patch, is it only a matter whether checking `frame.palette.dirty` to decide between putting the "initial" palette ? – mmgp Jan 27 '13 at 22:43
Can you submit a pull request to Pillow for this? https://github.com/python-imaging/Pillow/issues/312#issuecomment-21852418 – aclark Jul 31 '13 at 10:13

score 1 · Answer 3 · answered May 08 '23 at 08:24

I believe you could remove the transparency and .info part altogether and replace it with: im.convert("RGBA") just before .save with each frame. As long as you're going to export the frames in a format that supports Alpha channel, this should achieve the desired effect.

from PIL import Image

im = Image.open('Fighter-Front.gif')
im.convert("RGBA")
im.save('test1.png')

im.seek(im.tell()+1)
im.convert("RGBA")
im.save('test2.png')

Python: Converting GIF frames to PNG

3 Answers3

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