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Fix #6652: Handle translucent color used in RGB ImagePallete

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This commit is contained in:
João S. O. Bueno 2022-10-09 11:47:24 -03:00
parent 243402e78e
commit f9a3178bb3
2 changed files with 15 additions and 2 deletions
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9
Tests/test_imagepalette.py
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@ -50,6 +50,15 @@ def test_getcolor():
palette.getcolor("unknown") palette.getcolor("unknown")
def test_getcolor_raises_on_incompatible_color():
palette = ImagePalette.ImagePalette(mode="RGB")
# Opaque RGBA colors should work
palette.getcolor((0, 0, 0, 255))
assert palette.getcolor((0, 0, 0)) == palette.getcolor((0, 0, 0, 255))
with pytest.raises(ValueError):
palette.getcolor((0, 0, 0, 128))
@pytest.mark.parametrize( @pytest.mark.parametrize(
"index, palette", "index, palette",
[ [

8
src/PIL/ImagePalette.py
View File

@ -114,9 +114,13 @@ class ImagePalette:
if self.rawmode: if self.rawmode:
raise ValueError("palette contains raw palette data") raise ValueError("palette contains raw palette data")
if isinstance(color, tuple): if isinstance(color, tuple):
if self.mode == "RGB": if self.mode == "RGB" and len(color) == 4:
if len(color) == 4 and color[3] == 255: if color[3] == 255:
color = color[:3] color = color[:3]
else:
raise ValueError(
"RGB ImagePalette can't handle non-opaque RGBA colors"
)
elif self.mode == "RGBA": elif self.mode == "RGBA":
if len(color) == 3: if len(color) == 3:
color += (255,) color += (255,)