Created
June 17, 2024 05:53
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Danbooru Pixel Hash
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| #!/usr/bin/env python3 | |
| # Calculates an image's pixel hash as per the algorithm used by Danbooru | |
| from pyvips import Image | |
| from tempfile import TemporaryFile | |
| from pathlib import Path | |
| from typing import cast | |
| import hashlib | |
| import sys | |
| if len(sys.argv) != 2: | |
| print("No file supplied") | |
| exit(1) | |
| infile = Path(sys.argv[1]).resolve() | |
| if not infile.exists(): | |
| print("File does not exist") | |
| exit(1) | |
| # https://github.com/danbooru/danbooru/blob/bd0c6a37a81f851bd3e7862b97f7cf2fae7d5381/app/logical/media_file/image.rb#L214 | |
| image: Image = Image.new_from_file(infile) | |
| if image.get_typeof("icc-profile-data") != 0: | |
| image = cast(Image, image.icc_transform("srgb")) | |
| if image.interpretation != "srgb": | |
| image = cast(Image, image.colourspace("srgb")) | |
| if not image.hasalpha(): | |
| image = cast(Image, image.addalpha()) | |
| output_file = TemporaryFile("wb+") | |
| output_file.write("P7\n".encode()) | |
| output_file.write(f"WIDTH {image.width}\n".encode()) | |
| output_file.write(f"HEIGHT {image.height}\n".encode()) | |
| output_file.write(f"DEPTH {image.bands}\n".encode()) | |
| output_file.write("MAXVAL 255\n".encode()) | |
| output_file.write("TUPLTYPE RGB_ALPHA\n".encode()) | |
| output_file.write("ENDHDR\n".encode()) | |
| output_file.flush() | |
| image.rawsave_fd(output_file.fileno()) | |
| output_file.flush() | |
| output_file.seek(0) | |
| file_hash = hashlib.md5() | |
| while chunk := output_file.read(65536): | |
| file_hash.update(chunk) | |
| print(f"{infile.name} {file_hash.hexdigest()}") |
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