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Fixed remapping to palette with duplicate entries

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This commit is contained in:
Andrew Murray 2022-08-29 23:20:31 +10:00
parent ad7be550aa
commit e7fab6abf4
2 changed files with 15 additions and 0 deletions
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13
Tests/test_file_gif.py
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@ -1087,6 +1087,19 @@ def test_palette_save_P(tmp_path):
assert_image_equal(reloaded, im) assert_image_equal(reloaded, im)
def test_palette_save_duplicate_entries(tmp_path):
im = Image.new("P", (1, 2))
im.putpixel((0, 1), 1)
im.putpalette((0, 0, 0, 0, 0, 0))
out = str(tmp_path / "temp.gif")
im.save(out, palette=[0, 0, 0, 0, 0, 0, 1, 1, 1])
with Image.open(out) as reloaded:
assert reloaded.convert("RGB").getpixel((0, 1)) == (0, 0, 0)
def test_palette_save_all_P(tmp_path): def test_palette_save_all_P(tmp_path):
frames = [] frames = []
colors = ((255, 0, 0), (0, 255, 0)) colors = ((255, 0, 0), (0, 255, 0))

2
src/PIL/GifImagePlugin.py
View File

@ -523,6 +523,8 @@ def _normalize_palette(im, palette, info):
index = im.palette.colors[source_color] index = im.palette.colors[source_color]
except KeyError: except KeyError:
index = None index = None
if index in used_palette_colors:
index = None
used_palette_colors.append(index) used_palette_colors.append(index)
for i, index in enumerate(used_palette_colors): for i, index in enumerate(used_palette_colors):
if index is None: if index is None: