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Remove transparency if it cannot be remapped

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This commit is contained in:
Andrew Murray 2022-05-21 17:38:44 +10:00
parent 46a80d144a
commit 99f4623a8d
2 changed files with 19 additions and 1 deletions
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14
Tests/test_image.py
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@ -607,6 +607,20 @@ class TestImage:
with pytest.raises(ValueError): with pytest.raises(ValueError):
im.remap_palette(None) im.remap_palette(None)
def test_remap_palette_transparency(self):
im = Image.new("P", (1, 2))
im.putpixel((0, 1), 1)
im.info["transparency"] = 0
im_remapped = im.remap_palette([1, 0])
assert im_remapped.info["transparency"] == 1
# Test unused transparency
im.info["transparency"] = 2
im_remapped = im.remap_palette([1, 0])
assert "transparency" not in im_remapped.info
def test__new(self): def test__new(self):
im = hopper("RGB") im = hopper("RGB")
im_p = hopper("P") im_p = hopper("P")

6
src/PIL/Image.py
View File

@ -1935,7 +1935,11 @@ class Image:
m_im.palette = ImagePalette.ImagePalette("RGB", palette=palette_bytes) m_im.palette = ImagePalette.ImagePalette("RGB", palette=palette_bytes)
if "transparency" in self.info: if "transparency" in self.info:
m_im.info["transparency"] = new_positions[self.info["transparency"]] try:
m_im.info["transparency"] = dest_map.index(self.info["transparency"])
except ValueError:
if "transparency" in m_im.info:
del m_im.info["transparency"]
return m_im return m_im