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39 lines
893 B
Python
39 lines
893 B
Python
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#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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"""
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Usage: python rgb555.py image.png
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Round all colors of the input image to RGB555.
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"""
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import sys
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import png
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def rgb8_to_rgb5(c):
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return (c & 0b11111000) | (c >> 5)
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def round_pal(filename):
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with open(filename, 'rb') as file:
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width, height, rows = png.Reader(file).asRGBA8()[:3]
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rows = list(rows)
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for row in rows:
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del row[3::4]
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rows = [[rgb8_to_rgb5(c) for c in row] for row in rows]
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writer = png.Writer(width, height, greyscale=False, bitdepth=8, compression=9)
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with open(filename, 'wb') as file:
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writer.write(file, rows)
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def main():
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if len(sys.argv) < 2:
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print(f'Usage: {sys.argv[0]} pic.png', file=sys.stderr)
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sys.exit(1)
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for filename in sys.argv[1:]:
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if not filename.lower().endswith('.png'):
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print(f'{filename} is not a .png file!', file=sys.stderr)
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round_pal(filename)
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if __name__ == '__main__':
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main()
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