png_to_rgf.py

from PIL import Image, ImageOps

image = Image.open("snapshot.jpg")

width, height = image.size
if width > 178 or height > 128:
    image.thumbnail((178, 128))

image = ImageOps.pad(image, (178, 128), color=(255, 255, 255))
image = image.convert("1")
width, height = 178, 128

binary_data = bytes([width, height])
for y in range(height):
    cur_byte = 0
    cur_bit = 0
    for x in range(width):
        if image.getpixel((x, y)) == 0:
            cur_byte += pow(2, cur_bit)
        cur_bit += 1
        if cur_bit == 8:
            binary_data += bytes([cur_byte])
            cur_byte = 0
            cur_bit = 0
    binary_data += bytes([cur_byte])

with open("out.rgf", "wb") as out:
    out.write(binary_data)