58 lines
1.8 KiB
Python
58 lines
1.8 KiB
Python
#!/usr/bin/env python3
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"""Convert extracted .bmp sprites to .png with the black background made
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transparent (colorkey transparency).
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The EGF bitmaps store no usable alpha channel (alpha bytes are all zero);
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transparency is by colorkey, and the background is pure black RGB(0,0,0).
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This loads each BMP as RGB (ignoring the junk alpha), sets every pure-black
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pixel to fully transparent, and writes a PNG.
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Usage:
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python3 to_png.py [dir ...] # default: all gfx*_extracted dirs
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python3 to_png.py --key RRGGBB ... # custom colorkey (hex), default 000000
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python3 to_png.py --keep # keep .bmp files (default keeps them)
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"""
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import sys, os, glob
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from PIL import Image
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def convert(path, key):
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im = Image.open(path).convert('RGB') # force RGB, drop bogus alpha
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im = im.convert('RGBA')
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px = im.getdata()
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kr, kg, kb = key
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out = [(r, g, b, 0) if (r, g, b) == (kr, kg, kb) else (r, g, b, 255)
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for (r, g, b, a) in px]
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im.putdata(out)
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dst = os.path.splitext(path)[0] + '.png'
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im.save(dst)
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return dst
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def main():
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args = sys.argv[1:]
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key = (0, 0, 0)
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dirs = []
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i = 0
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while i < len(args):
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if args[i] == '--key':
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h = args[i+1].lstrip('#')
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key = (int(h[0:2], 16), int(h[2:4], 16), int(h[4:6], 16))
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i += 2
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else:
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dirs.append(args[i]); i += 1
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if not dirs:
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dirs = sorted(glob.glob('gfx*_extracted'))
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total = 0
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for d in dirs:
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bmps = sorted(glob.glob(os.path.join(d, '*.bmp')))
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for b in bmps:
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try:
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convert(b, key)
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total += 1
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except Exception as ex:
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print(' ERROR %s: %s' % (b, ex))
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print('%s -> %d png' % (d, len(bmps)))
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print('TOTAL %d png (colorkey %02x%02x%02x)' % (total, *key))
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if __name__ == '__main__':
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main()
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