62 lines
1.6 KiB
Python
62 lines
1.6 KiB
Python
# © 2018 James R. Barlow: github.com/jbarlow83
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#
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# This Source Code Form is subject to the terms of the Mozilla Public
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# License, v. 2.0. If a copy of the MPL was not distributed with this
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# file, You can obtain one at http://mozilla.org/MPL/2.0/.
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"""Interface to pngquant executable"""
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from os import fspath
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from tempfile import NamedTemporaryFile
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from PIL import Image
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from ocrmypdf.exceptions import MissingDependencyError
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from ocrmypdf.subprocess import get_version, run
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def version():
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return get_version('pngquant', regex=r'(\d+(\.\d+)*).*')
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def available():
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try:
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version()
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except MissingDependencyError:
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return False
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return True
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def quantize(input_file, output_file, quality_min, quality_max):
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input_file = fspath(input_file)
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output_file = fspath(output_file)
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if input_file.endswith('.jpg'):
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with Image.open(input_file) as im, NamedTemporaryFile(suffix='.png') as tmp:
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im.save(tmp)
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args = [
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'pngquant',
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'--force',
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'--skip-if-larger',
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'--output',
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output_file,
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'--quality',
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f'{quality_min}-{quality_max}',
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'--',
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tmp.name,
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]
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run(args)
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else:
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args = [
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'pngquant',
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'--force',
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'--skip-if-larger',
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'--output',
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output_file,
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'--quality',
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f'{quality_min}-{quality_max}',
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'--',
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input_file,
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]
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run(args)
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