python-pillow/Pillow
1
1
Fork 0
mirror of https://github.com/python-pillow/Pillow.git synced 2025-01-23 15:54:09 +03:00
Code Issues Packages Projects Releases Wiki Activity

Added conversion between RGB/RGBA/RGBX and LAB

Browse Source
This commit is contained in:
Andrew Murray 2022-10-07 22:33:45 +11:00
parent 243402e78e
commit fcd3eef594
2 changed files with 24 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
Tests/test_image_convert.py
View File

@ -242,6 +242,17 @@ def test_p2pa_palette():
assert im_pa.getpalette() == im.getpalette()
@pytest.mark.parametrize("mode", ("RGB", "RGBA", "RGBX"))
def test_rgb_lab(mode):
im = Image.new(mode, (1, 1))
converted_im = im.convert("LAB")
assert converted_im.getpixel((0, 0)) == (0, 128, 128)
im = Image.new("LAB", (1, 1), (255, 0, 0))
converted_im = im.convert(mode)
assert converted_im.getpixel((0, 0))[:3] == (0, 255, 255)
def test_matrix_illegal_conversion():
# Arrange
im = hopper("CMYK")

13
src/PIL/Image.py
View File

@ -1027,6 +1027,19 @@ class Image:
warnings.warn("Couldn't allocate palette entry for transparency")
return new
if "LAB" in (self.mode, mode):
other_mode = mode if self.mode == "LAB" else self.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]
transform = ImageCms.buildTransform(
profiles[0], profiles[1], self.mode, mode
)
return transform.apply(self)
# colorspace conversion
if dither is None:
dither = Dither.FLOYDSTEINBERG