47 lines
1.6 KiB
Python
47 lines
1.6 KiB
Python
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#!/usr/bin/env python3
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"""检查图片的实际透明度；不会抠图、修改图片或判断构图质量。"""
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import argparse
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import json
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from pathlib import Path
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from PIL import Image
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def inspect_alpha(path):
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with Image.open(path) as im:
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native_alpha = "A" in im.getbands() or "transparency" in im.info
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histogram = im.convert("RGBA").getchannel("A").histogram()
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total = im.width * im.height
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transparent = histogram[0]
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partial = sum(histogram[1:255])
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opaque = histogram[255]
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return {
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"path": str(Path(path).resolve()),
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"mode": im.mode,
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"size": [im.width, im.height],
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"has_alpha_or_transparency_metadata": native_alpha,
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"transparent_pixels": transparent,
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"partial_alpha_pixels": partial,
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"opaque_pixels": opaque,
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"nonopaque_fraction": (transparent + partial) / total,
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"has_visible_content": partial + opaque > 0,
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"transparency_check_passed": native_alpha
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and transparent + partial > 0
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and partial + opaque > 0,
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}
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def main():
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parser = argparse.ArgumentParser(description=__doc__)
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parser.add_argument("image", type=Path)
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parser.add_argument("--require-transparency", action="store_true")
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args = parser.parse_args()
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result = inspect_alpha(args.image)
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print(json.dumps(result, ensure_ascii=False, indent=2))
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if args.require_transparency and not result["transparency_check_passed"]:
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return 2
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return 0
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if __name__ == "__main__":
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raise SystemExit(main())
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