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Quantize transparent images by blending with white

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This commit is contained in:
Kovid Goyal 2016-05-08 15:51:20 +05:30
parent 41ee48fe53
commit dbf7afa084
1 changed files with 4 additions and 1 deletions
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5
src/calibre/utils/img.py
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@ -282,7 +282,10 @@ def normalize(img):
def quantize(img, num_of_colors=256, dither=True):
if imageops is None:
raise RuntimeError(imageops_err)
return imageops.quantize(image_from_data(img), num_of_colors, dither)
img = image_from_data(img)
if img.hasAlphaChannel():
img = blend_image(img)
return imageops.quantize(img, num_of_colors, dither)
def run_optimizer(file_path, cmd, as_filter=False, input_data=None):
file_path = os.path.abspath(file_path)