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Updated error message

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This commit is contained in:
Andrew Murray 2022-10-10 12:02:10 +11:00
parent 982d7c49e3
commit 0b2cef5b03
2 changed files with 12 additions and 11 deletions
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11
Tests/test_imagepalette.py
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@ -50,11 +50,12 @@ def test_getcolor():
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))
def test_getcolor_rgba_color_rgb_palette():
palette = ImagePalette.ImagePalette("RGB")
# Opaque RGBA colors are converted
assert palette.getcolor((0, 0, 0, 255)) == palette.getcolor((0, 0, 0))
with pytest.raises(ValueError):
palette.getcolor((0, 0, 0, 128))

10
src/PIL/ImagePalette.py
View File

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