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Support converting more modes to LAB by converting to RGBA first #8358

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merged 1 commit into from
Sep 9, 2024
Merged

Support converting more modes to LAB by converting to RGBA first #8358

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6 changes: 6 additions & 0 deletions Tests/test_imagecms.py
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Original file line number Diff line number Diff line change
Expand Up @@ -696,6 +696,12 @@ def test_rgb_lab(mode: str) -> None:
assert value[:3] == (0, 255, 255)


def test_cmyk_lab() -> None:
im = Image.new("CMYK", (1, 1))
converted_im = im.convert("LAB")
assert converted_im.getpixel((0, 0)) == (255, 128, 128)


def test_deprecation() -> None:
with pytest.warns(DeprecationWarning):
assert ImageCms.DESCRIPTION.strip().startswith("pyCMS")
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14 changes: 10 additions & 4 deletions src/PIL/Image.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1127,17 +1127,23 @@ def convert_transparency(
return new_im

if "LAB" in (self.mode, mode):
other_mode = mode if self.mode == "LAB" else self.mode
im = self
if mode == "LAB":
if im.mode not in ("RGB", "RGBA", "RGBX"):
im = im.convert("RGBA")
other_mode = im.mode
else:
other_mode = mode
if other_mode in ("RGB", "RGBA", "RGBX"):
from . import ImageCms

srgb = ImageCms.createProfile("sRGB")
lab = ImageCms.createProfile("LAB")
profiles = [lab, srgb] if self.mode == "LAB" else [srgb, lab]
profiles = [lab, srgb] if im.mode == "LAB" else [srgb, lab]
transform = ImageCms.buildTransform(
profiles[0], profiles[1], self.mode, mode
profiles[0], profiles[1], im.mode, mode
)
return transform.apply(self)
return transform.apply(im)

# colorspace conversion
if dither is None:
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