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Merge pull request #6654 from jsbueno/fix6652/imagepalette_rgba_color

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Raise an error when allocating translucent color to RGB palette
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Andrew Murray 2022-10-10 19:23:18 +11:00 committed by GitHub
commit 10edb29674
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3 changed files with 19 additions and 4 deletions
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7
Tests/test_image_access.py
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@ -345,13 +345,14 @@ class TestCffi(AccessTest):
@pytest.mark.parametrize("mode", ("P", "PA"))
def test_p_putpixel_rgb_rgba(self, mode):
for color in [(255, 0, 0), (255, 0, 0, 127)]:
for color in ((255, 0, 0), (255, 0, 0, 127 if mode == "PA" else 255)):
im = Image.new(mode, (1, 1))
access = PyAccess.new(im, False)
access.putpixel((0, 0), color)
alpha = color[3] if len(color) == 4 and mode == "PA" else 255
assert im.convert("RGBA").getpixel((0, 0)) == (255, 0, 0, alpha)
if len(color) == 3:
color += (255,)
assert im.convert("RGBA").getpixel((0, 0)) == color
class TestImagePutPixelError(AccessTest):

10
Tests/test_imagepalette.py
View File

@ -50,6 +50,16 @@ def test_getcolor():
palette.getcolor("unknown")
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))
@pytest.mark.parametrize(
"index, palette",
[

6
src/PIL/ImagePalette.py
View File

@ -115,7 +115,11 @@ class ImagePalette:
raise ValueError("palette contains raw palette data")
if isinstance(color, tuple):
if self.mode == "RGB":
if len(color) == 4 and color[3] == 255:
if len(color) == 4:
if color[3] != 255:
raise ValueError(
"cannot add non-opaque RGBA color to RGB palette"
)
color = color[:3]
elif self.mode == "RGBA":
if len(color) == 3: