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Updating decode_gif to default to DISPOSE_DO_NOT to fix animated gif loading #9241

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Updating decode_gif to default to DISPOSE_DO_NOT to fix animated gif loading #9241

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There are errors loading animated gifs where the frame disposal method is set to DISPOSAL_UNSPECIFIED #9009

This is because when an animated gif has disposal mode DISPOSAL_UNSPECIFIED, decode_gif is defaulting to "background" drawing mode. It needs to be DISPOSE_DO_NOT instead where changes are overwritten onto the previous canvas. This is the default behaviour of web browsers and libraries like Pillow - GifImagePlugin.py.

After this the example gif subsequent frames display correctly

import cv2
import torchvision

gif = torchvision.io.read_image('jake.gif').numpy().transpose(0, 2, 3, 1)
image = cv2.cvtColor(gif[5], cv2.COLOR_RGB2BGR)
cv2.imshow(f'Frame 5', image)
cv2.waitKey()
image

@sg3-141-592
Updating decode_gif to default to DISPOSE_DO_NOT when a frame has dis…
1e0099a 
…posal mode DISPOSAL_UNSPECIFIED or DISPOSAL_PREVIOUS. This fixes loading animated gifs with these modes set
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pytorch-bot bot commented Oct 11, 2025

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/vision/9241

Note: Links to docs will display an error until the docs builds have been completed.

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meta-cla bot commented Oct 11, 2025

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@sg3-141-592 sg3-141-592 marked this pull request as draft October 11, 2025 10:59
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