40 lines
1.3 KiB
Python
40 lines
1.3 KiB
Python
"""Small-thumbnail quality heuristics. Never delete or modify source photos."""
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import hashlib
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from io import BytesIO
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from PIL import Image, ImageFilter, ImageOps, ImageStat
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def photo_quality(data):
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with Image.open(BytesIO(data), formats=("JPEG", "PNG", "WEBP")) as source:
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image = ImageOps.exif_transpose(source).convert("L")
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image.thumbnail((256, 256))
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brightness = ImageStat.Stat(image).mean[0]
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edges = image.filter(ImageFilter.FIND_EDGES)
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sharpness = ImageStat.Stat(
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edges.crop((2, 2, max(3, image.width - 2), max(3, image.height - 2)))
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).var[0]
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small = image.resize((9, 8))
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pixels = list(small.tobytes())
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bits = "".join(
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"1" if pixels[y * 9 + x] > pixels[y * 9 + x + 1] else "0"
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for y in range(8)
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for x in range(8)
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)
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return {
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"brightness": round(brightness, 2),
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"sharpness": round(sharpness, 2),
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"fingerprint": f"{int(bits, 2):016x}",
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"sha256": hashlib.sha256(data).hexdigest(),
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}
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def passes(result, source):
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return (
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result["sharpness"] >= source.minimum_sharpness
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and source.minimum_brightness
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<= result["brightness"]
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<= source.maximum_brightness
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)
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