from collections import defaultdict

from PIL import (
    Image,
    ImageDraw,
    ImageFont
)

img = Image.new('1', (8, 16))
font = ImageFont.truetype('arial.ttf', 10)
draw = ImageDraw.Draw(img)

forward_lut = {}
reverse_lut = defaultdict(list)

for i in range(32, 0xFFFF):
    c = chr(i)
    draw.rectangle((0, 0, 8, 16), fill=(255, ))
    draw.text((0, 0), c, font=font, fill=(0, ))
    pixels = map(lambda x: str(x & 1), img.getdata())
    footprint = int(''.join(pixels), 2)
    reverse_lut[footprint].append(c)
    forward_lut[c] = footprint