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Allow remap_palette() to return an image with less than 256 palette entries #6543

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merged 1 commit into from Sep 21, 2022
+2 −5
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Allow remap_palette() to return an image with less than 256 palette entries #6543

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1 change: 1 addition & 0 deletions Tests/test_image.py
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Expand Up @@ -620,6 +620,7 @@ def test_remap_palette_transparency(self):

im_remapped = im.remap_palette([1, 0])
assert im_remapped.info["transparency"] == 1
assert len(im_remapped.getpalette()) == 6

# Test unused transparency
im.info["transparency"] = 2
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6 changes: 1 addition & 5 deletions src/PIL/Image.py
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Expand Up @@ -1944,11 +1944,7 @@ def remap_palette(self, dest_map, source_palette=None):

m_im = m_im.convert("L")

# Internally, we require 256 palette entries.
new_palette_bytes = (
palette_bytes + ((256 * bands) - len(palette_bytes)) * b"\x00"
)
m_im.putpalette(new_palette_bytes, palette_mode)
m_im.putpalette(palette_bytes, palette_mode)
m_im.palette = ImagePalette.ImagePalette(palette_mode, palette=palette_bytes)

if "transparency" in self.info:
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