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Create gif frame delta by subtracting 0x0 image if disposal is mode 2

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This commit is contained in:
Riley Lahd 2019-03-08 15:56:31 -07:00
parent 1f6d1be7fc
commit 4a2be2af2d
1 changed files with 5 additions and 3 deletions
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8
src/PIL/GifImagePlugin.py
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@ -443,9 +443,11 @@ def _write_multiple_frames(im, fp, palette):
if im_frames:
# delta frame
previous = im_frames[-1]
if "disposal" in encoderinfo and encoderinfo["disposal"] == 2:
# If diposing whole frame, treat full new frame as delta
delta = im_frame
if encoderinfo["disposal"] == 2:
# Entire frame should be delta
# Create delta by subtracting empty image from frame (This is required)
delta = ImageChops.subtract_modulo(
im_frame, Image.new('P', (0,0)))
elif _get_palette_bytes(im_frame) == \
_get_palette_bytes(previous['im']):
delta = ImageChops.subtract_modulo(im_frame,