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Merge pull request #5282 from radarhere/quantize

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Set all transparent colors to be equal in quantize()
This commit is contained in:
Hugo van Kemenade 2021-03-31 17:58:21 +03:00 committed by GitHub
commit 727533148e
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2 changed files with 27 additions and 6 deletions
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10
Tests/test_image_quantize.py
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@ -74,3 +74,13 @@ def test_quantize_dither_diff():
nodither = image.quantize(dither=0, palette=palette)
assert dither.tobytes() != nodither.tobytes()
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]

23
src/libImaging/Quant.c
View File

@ -1683,9 +1683,26 @@ ImagingQuantize(Imaging im, int colors, int mode, int kmeans) {
} else if (!strcmp(im->mode, "RGB") || !strcmp(im->mode, "RGBA")) {
/* true colour */
withAlpha = !strcmp(im->mode, "RGBA");
int transparency = 0;
unsigned char r, g, b;
for (i = y = 0; y < im->ysize; y++) {
for (x = 0; x < im->xsize; x++, i++) {
p[i].v = im->image32[y][x];
if (withAlpha && p[i].c.a == 0) {
if (transparency == 0) {
transparency = 1;
r = p[i].c.r;
g = p[i].c.g;
b = p[i].c.b;
} else {
/* Set all subsequent transparent pixels
to the same colour as the first */
p[i].c.r = r;
p[i].c.g = g;
p[i].c.b = b;
}
}
}
}
@ -1720,9 +1737,6 @@ ImagingQuantize(Imaging im, int colors, int mode, int kmeans) {
kmeans);
break;
case 2:
if (!strcmp(im->mode, "RGBA")) {
withAlpha = 1;
}
result = quantize_octree(
p,
im->xsize * im->ysize,
@ -1734,9 +1748,6 @@ ImagingQuantize(Imaging im, int colors, int mode, int kmeans) {
break;
case 3:
#ifdef HAVE_LIBIMAGEQUANT
if (!strcmp(im->mode, "RGBA")) {
withAlpha = 1;
}
result = quantize_pngquant(
p,
im->xsize,