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Test core image palette directly #15

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Test core image palette directly #15

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39c5152
Add xfailing test for pa2p quirk
akx Jul 29, 2026
31693e6
Ensure Image and core palettes are in sync after PA conversion (alpha…
akx Jul 29, 2026
b5b7c33
Merge branch 'main' into pa-to-p-to-rgba
radarhere Aug 17, 2026
b3d64e2
Rearrange code
radarhere Aug 17, 2026
de31565
Test core image palette directly
radarhere Aug 17, 2026
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12 changes: 12 additions & 0 deletions Tests/test_image_convert.py
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Original file line number Diff line number Diff line change
Expand Up @@ -290,6 +290,18 @@ def test_p2pa_palette() -> None:
assert im_pa.getpalette() == im.getpalette()


def test_pa2p_palette() -> None:
im_pa = Image.frombytes("PA", (2, 1), bytes([0, 255, 1, 255]))
im_pa.putpalette(bytes([255, 0, 0, 7, 0, 255, 0, 9]), "RGBA")

im_pa.putalpha(Image.frombytes("L", (2, 1), bytes([240, 220])))
assert im_pa.get_flattened_data() == ((0, 240), (1, 220)) # Matches the alpha band

im_p = im_pa.convert("P")
assert im_p.im.getpalettemode() == "RGB"
assert im_p.im.getpalette("RGB") == bytes([255, 0, 0, 0, 255, 0])


rgb2xyz_matrix = (
0.412453, 0.357580, 0.180423, 0,
0.212671, 0.715160, 0.072169, 0,
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5 changes: 2 additions & 3 deletions src/PIL/Image.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1242,9 +1242,8 @@ def convert_transparency(

new_im = self._new(im)
if mode in ("P", "PA") and palette != Palette.ADAPTIVE:
from . import ImagePalette

new_im.palette = ImagePalette.ImagePalette("RGB", im.getpalette("RGB"))
# Install the original image's palette into the new copy
new_im.putpalette(im.getpalette("RGB"))
if delete_trns:
# crash fail if we leave a bytes transparency in an rgb/l mode.
del new_im.info["transparency"]
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