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Drop alpha channels when computing frame delta

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This commit is contained in:
Peter Rowlands 2020-03-15 20:02:10 +09:00
parent 9f61be4c72
commit 8373c38840
1 changed files with 3 additions and 1 deletions
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4
src/PIL/PngImagePlugin.py
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@ -1058,7 +1058,9 @@ def _write_multiple_frames(im, fp, chunk, rawmode):
base_im = im_frames[-2]["im"] base_im = im_frames[-2]["im"]
else: else:
base_im = previous["im"] base_im = previous["im"]
delta = ImageChops.subtract_modulo(im_frame, base_im) delta = ImageChops.subtract_modulo(
im_frame.convert("RGB"), base_im.convert("RGB")
)
bbox = delta.getbbox() bbox = delta.getbbox()
if ( if (
not bbox not bbox