python-pillow/Pillow
1
1
Fork 0
mirror of https://github.com/python-pillow/Pillow.git synced 2025-09-24 13:07:00 +03:00
Code Issues Packages Projects Releases Wiki Activity

When converting RGBA to PA, use RGB to P quantization

Browse Source
This commit is contained in:
Andrew Murray 2025-08-15 23:39:33 +10:00
parent 0ae2611b44
commit ba66fec3d2
2 changed files with 15 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
Tests/test_image_convert.py
View File

@ -107,6 +107,13 @@ def test_rgba_p() -> None:
assert_image_similar(im, comparable, 20) assert_image_similar(im, comparable, 20)
def test_rgba_pa() -> None:
im = hopper("RGBA").convert("PA").convert("RGB")
expected = hopper("RGB")
assert_image_similar(im, expected, 9.3)
def test_rgba() -> None: def test_rgba() -> None:
with Image.open("Tests/images/transparent.png") as im: with Image.open("Tests/images/transparent.png") as im:
assert im.mode == "RGBA" assert im.mode == "RGBA"

8
src/PIL/Image.py
View File

@ -1010,8 +1010,14 @@ class Image:
new_im.info["transparency"] = transparency new_im.info["transparency"] = transparency
return new_im return new_im
if mode == "P" and self.mode == "RGBA": if self.mode == "RGBA":
if mode == "P":
return self.quantize(colors) return self.quantize(colors)
elif mode == "PA":
r, g, b, a = self.split()
rgb = merge("RGB", (r, g, b))
p = rgb.quantize(colors)
return merge("PA", (p, a))
trns = None trns = None
delete_trns = False delete_trns = False