Image distortion in GIFs when I use crop

[shangcheng77]

img = pil_img.open(img_path)
width, height = img.size
del_width = random.randint(1, 10)
del_height = random.randint(1, 10)
box = (0, 0, width - del_width, height - del_height)
frames = [img.crop(box) for frame in range(0, img.n_frames) if not img.seek(frame)]
frames[0].save(new_path, save_all=True, append_images=frames, loop=0, duration=img.info['duration'])

[shangcheng77]

The gif after deal is bigger than 10M，so I can’t upload it

[radarhere]

I'm able to upload it. Is this what you're seeing? So you're talking about the occasional frame having incorrect colours?

[shangcheng77]

img = pil_img.open(img_path)
width, height = img.size
box = (0, 0, width - 10, height - 10)
frames = [img.crop(box) for frame in range(0, img.n_frames) if not img.seek(frame)]
frames[0].save(new_path, save_all=True, append_images=frames[:60], loop=0, duration=img.info['duration'])

I saved less frames to limit gif size，my results of crop is serious distortion

[radarhere]

What version of Pillow are you using? If I go back to Pillow 8.1.2, then I get your version. So I expect if you upgrade to a more recent version of Pillow, your output will be improved to match mine.

[radarhere]

To confirm that you are using the upgraded Pillow, does print(pil_img.__version__) show 8.3.1?

[shangcheng77]

8.3.1 In another gif

[radarhere]

Pillow 9.0.0 has significantly improved reading animated GIFs thanks to #5857.

If this issue is still a problem when using Pillow 9.0.0, please let us know.