If you're always going from grey to tinted, then the easiest way is to 
treat it as a 'P' image with a special palette.

I believe this function will prepare the palette:
        def make_palette(tr, tg, tb):
            l = []
            for i in range(255):
                l.extend([tr*i / 255, tg*i / 255, tb*i / 255])
            return l

Here's an example:
        import Image

        A, B, C = map(chr, [64, 128, 192])
        i = Image.fromstring(
            'P', (4,4), ''.join([
            B,B,B,B,
            B,C,C,A,
            B,C,C,A,
            B,A,A,A]))
        i.putpalette(make_palette(64,64,255))
        i.show()

Jeff

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