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35 lines
956 B
Python
35 lines
956 B
Python
#!/usr/bin/env python
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from PIL import Image
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def make_cx16_palette(palette: list[int]) -> bytes:
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def to4bit(color: int) -> int:
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return (color * 15 + 135) >> 8 # see https://threadlocalmutex.com/?p=48
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cx16palette = bytearray()
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for pi in range(0, len(palette), 3):
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r = to4bit(palette[pi])
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g = to4bit(palette[pi+1])
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b = to4bit(palette[pi+2])
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cx16palette.append(g << 4 | b)
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cx16palette.append(r)
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return cx16palette
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img = Image.open("dragonsprite.png")
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assert img.size == (64, 128) and img.mode == 'P'
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data = bytearray()
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for y in range(0, 128):
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for x in range(0, 64, 2):
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pix1 = img.getpixel((x, y))
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pix2 = img.getpixel((x + 1, y))
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data.append(pix1 << 4 | pix2)
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palette = make_cx16_palette(img.getpalette())
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assert len(data) == 64 * 128 / 2
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assert len(palette) <= 16*2
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open("DRAGONSPRITE.PAL", "wb").write(palette)
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open("DRAGONSPRITE.BIN", "wb").write(data)
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