Skip to content

Fix ImagePalette colors for raw palettes #9821

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
nightcityblade wants to merge 3 commits into
base: main
Choose a base branch
from
+24 −2
Open

Fix ImagePalette colors for raw palettes #9821

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
3 commits
Select commit Hold shift + click to select a range
bf508a7
Fix ImagePalette colors for raw palettes
Jul 23, 2026
84571ab
Use core palette conversion for raw colors
Jul 24, 2026
b3bbfe5
Support sequence data in raw palette colors
Jul 24, 2026
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
14 changes: 14 additions & 0 deletions Tests/test_imagepalette.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,20 @@ def test_sanity() -> None:
assert len(palette.colors) == 256


def test_colors_rawmode() -> None:
palette = ImagePalette.raw(
"BGRX",
(0, 0, 0, 0, 255, 255, 255, 0, 0, 0, 255, 0, 0, 255, 0, 0, 255, 0, 0, 0),
)
assert palette.colors == {
(0, 0, 0): 0,
(255, 255, 255): 1,
(255, 0, 0): 2,
(0, 255, 0): 3,
(0, 0, 255): 4,
}


def test_reload() -> None:
with Image.open("Tests/images/hopper.gif") as im:
original = im.copy()
Expand Down
12 changes: 10 additions & 2 deletions src/PIL/ImagePalette.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -62,10 +62,18 @@ def palette(self, palette: Sequence[int] | bytes | bytearray) -> None:
@property
def colors(self) -> dict[tuple[int, ...], int]:
if self._colors is None:
palette = self.palette
if self.rawmode:
from . import Image

im = Image.core.new("P", (0, 0))
im.putpalette(self.mode, self.rawmode, bytes(palette))
palette = im.getpalette(self.mode, self.mode)

mode_len = len(self.mode)
self._colors = {}
for i in range(0, len(self.palette), mode_len):
color = tuple(self.palette[i : i + mode_len])
for i in range(0, len(palette), mode_len):
color = tuple(palette[i : i + mode_len])
if color in self._colors:
continue
self._colors[color] = i // mode_len
Expand Down