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Support converting more modes to LAB by converting to RGBA first

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This commit is contained in:
Andrew Murray 2024-09-07 12:14:30 +10:00
parent 6377321625
commit de3c6fa295
2 changed files with 16 additions and 4 deletions
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6
Tests/test_imagecms.py
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@ -696,6 +696,12 @@ def test_rgb_lab(mode: str) -> None:
assert value[:3] == (0, 255, 255) 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: def test_deprecation() -> None:
with pytest.warns(DeprecationWarning): with pytest.warns(DeprecationWarning):
assert ImageCms.DESCRIPTION.strip().startswith("pyCMS") assert ImageCms.DESCRIPTION.strip().startswith("pyCMS")

14
src/PIL/Image.py
View File

@ -1127,17 +1127,23 @@ class Image:
return new_im return new_im
if "LAB" in (self.mode, mode): 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"): if other_mode in ("RGB", "RGBA", "RGBX"):
from . import ImageCms from . import ImageCms
srgb = ImageCms.createProfile("sRGB") srgb = ImageCms.createProfile("sRGB")
lab = ImageCms.createProfile("LAB") 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( 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 # colorspace conversion
if dither is None: if dither is None: