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Ignore non-opaque WebP background when saving as GIF

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This commit is contained in:
Andrew Murray 2022-12-09 10:45:09 +11:00
parent 0d6440d9f2
commit 66f5ad0eae
2 changed files with 20 additions and 8 deletions
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13
Tests/test_file_gif.py
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@ -859,12 +859,21 @@ def test_background(tmp_path):
im.info["background"] = 1
im.save(out)
with Image.open(out) as reread:
assert reread.info["background"] == im.info["background"]
def test_webp_background(tmp_path):
out = str(tmp_path / "temp.gif")
# Test opaque WebP background
if features.check("webp") and features.check("webp_anim"):
with Image.open("Tests/images/hopper.webp") as im:
assert isinstance(im.info["background"], tuple)
assert im.info["background"] == (255, 255, 255, 255)
im.save(out)
# Test non-opaque WebP background
im = Image.new("L", (100, 100), "#000")
im.info["background"] = (0, 0, 0, 0)
im.save(out)

15
src/PIL/GifImagePlugin.py
View File

@ -886,20 +886,23 @@ def _get_palette_bytes(im):
def _get_background(im, info_background):
background = 0
if info_background:
background = info_background
if isinstance(background, tuple):
if isinstance(info_background, tuple):
# WebPImagePlugin stores an RGBA value in info["background"]
# So it must be converted to the same format as GifImagePlugin's
# info["background"] - a global color table index
try:
background = im.palette.getcolor(background, im)
background = im.palette.getcolor(info_background, im)
except ValueError as e:
if str(e) == "cannot allocate more than 256 colors":
if str(e) not in (
# If all 256 colors are in use,
# then there is no need for the background color
return 0
else:
"cannot allocate more than 256 colors",
# Ignore non-opaque WebP background
"cannot add non-opaque RGBA color to RGB palette",
):
raise
else:
background = info_background
return background