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https://github.com/freedoom/freedoom.git
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6eef9be73a
Python 2 is very near end-of-life, and Python3-compatible changes to a few scripts introduced compatibility problems with 2.7 again. It went unnoticed for me since my system symlinks "python" to "python3", but it broke the build on systems where that symlink is still python2. At this point in time, I feel it is worth targetting modern Python and forgetting about 2.7.
59 lines
2 KiB
Python
Executable file
59 lines
2 KiB
Python
Executable file
#!/usr/bin/env python3
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# SPDX-License-Identifier: MIT
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# Copyright (c) 2017 Martin Miller, Nick Zatkovich
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# https://stackoverflow.com/questions/12251896/colorize-image-while-preserving-transparency-with-pil
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from PIL import Image, ImageColor, ImageOps
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def image_tint(image, tint=None):
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if tint is None:
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return image
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if image.mode not in ["RGB", "RGBA"]:
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image = image.convert("RGBA")
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tr, tg, tb = ImageColor.getrgb(tint)
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tl = ImageColor.getcolor(tint, "L") # tint color's overall luminosity
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if not tl:
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tl = 1 # avoid division by zero
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tl = float(tl) # compute luminosity preserving tint factors
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sr, sg, sb = map(
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lambda tv: tv / tl, (tr, tg, tb)
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) # per component adjustments
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# create look-up tables to map luminosity to adjusted tint
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# (using floating-point math only to compute table)
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luts = (
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tuple(map(lambda lr: int(lr * sr + 0.5), range(256)))
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+ tuple(map(lambda lg: int(lg * sg + 0.5), range(256)))
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+ tuple(map(lambda lb: int(lb * sb + 0.5), range(256)))
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)
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l = ImageOps.grayscale(image) # 8-bit luminosity version of whole image
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if Image.getmodebands(image.mode) < 4:
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merge_args = (image.mode, (l, l, l)) # for RGB verion of grayscale
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else: # include copy of image's alpha layer
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a = Image.new("L", image.size)
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a.putdata(image.getdata(3))
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merge_args = (image.mode, (l, l, l, a)) # for RGBA verion of grayscale
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luts += tuple(range(256)) # for 1:1 mapping of copied alpha values
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return Image.merge(*merge_args).point(luts)
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def main(input_image_path, tintcolor, result_image_path):
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image = Image.open(input_image_path)
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image.load()
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result = image_tint(image, tintcolor)
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if os.path.exists(result_image_path): # delete any previous result file
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os.remove(result_image_path)
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result.save(result_image_path) # file name's extension determines format
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if __name__ == "__main__":
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import os
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import sys
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main(sys.argv[1], sys.argv[2], sys.argv[3])
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