import pytest from packaging.version import parse as parse_version from PIL import Image, features from .helper import assert_image_similar, hopper, is_ppc64le, skip_unless_feature def test_sanity(): image = hopper() converted = image.quantize() assert converted.mode == "P" assert_image_similar(converted.convert("RGB"), image, 10) image = hopper() converted = image.quantize(palette=hopper("P")) assert converted.mode == "P" assert_image_similar(converted.convert("RGB"), image, 60) @skip_unless_feature("libimagequant") def test_libimagequant_quantize(): image = hopper() if is_ppc64le(): libimagequant = parse_version(features.version_feature("libimagequant")) if libimagequant < parse_version("4"): pytest.skip("Fails with libimagequant earlier than 4.0.0 on ppc64le") converted = image.quantize(100, Image.Quantize.LIBIMAGEQUANT) assert converted.mode == "P" assert_image_similar(converted.convert("RGB"), image, 15) assert len(converted.getcolors()) == 100 def test_octree_quantize(): image = hopper() converted = image.quantize(100, Image.Quantize.FASTOCTREE) assert converted.mode == "P" assert_image_similar(converted.convert("RGB"), image, 20) assert len(converted.getcolors()) == 100 def test_rgba_quantize(): image = hopper("RGBA") with pytest.raises(ValueError): image.quantize(method=0) assert image.quantize().convert().mode == "RGBA" def test_quantize(): with Image.open("Tests/images/caption_6_33_22.png") as image: image = image.convert("RGB") converted = image.quantize() assert converted.mode == "P" assert_image_similar(converted.convert("RGB"), image, 1) def test_quantize_no_dither(): image = hopper() with Image.open("Tests/images/caption_6_33_22.png") as palette: palette = palette.convert("P") converted = image.quantize(dither=Image.Dither.NONE, palette=palette) assert converted.mode == "P" assert converted.palette.palette == palette.palette.palette def test_quantize_dither_diff(): image = hopper() with Image.open("Tests/images/caption_6_33_22.png") as palette: palette = palette.convert("P") dither = image.quantize(dither=Image.Dither.FLOYDSTEINBERG, palette=palette) nodither = image.quantize(dither=Image.Dither.NONE, palette=palette) assert dither.tobytes() != nodither.tobytes() def test_colors(): im = hopper() colors = 2 converted = im.quantize(colors) assert len(converted.palette.palette) == colors * len("RGB") def test_transparent_colors_equal(): im = Image.new("RGBA", (1, 2), (0, 0, 0, 0)) px = im.load() px[0, 1] = (255, 255, 255, 0) converted = im.quantize() converted_px = converted.load() assert converted_px[0, 0] == converted_px[0, 1] @pytest.mark.parametrize( "method, color", ( (Image.Quantize.MEDIANCUT, (0, 0, 0)), (Image.Quantize.MAXCOVERAGE, (0, 0, 0)), (Image.Quantize.FASTOCTREE, (0, 0, 0)), (Image.Quantize.FASTOCTREE, (0, 0, 0, 0)), ), ) def test_palette(method, color): im = Image.new("RGBA" if len(color) == 4 else "RGB", (1, 1), color) converted = im.quantize(method=method) converted_px = converted.load() assert converted_px[0, 0] == converted.palette.colors[color] def test_small_palette(): # Arrange im = hopper() colors = (255, 0, 0, 0, 0, 255) p = Image.new("P", (1, 1)) p.putpalette(colors) # Act im = im.quantize(palette=p) # Assert assert len(im.getcolors()) == 2