grayprint.py

import PIL
from PIL import Image
import sys
def print_img(f):
    img = Image.open(f)
    basewidth= 320 
    hsize = img.height * basewidth // img.width
    print(img.size)
    img=img.resize((basewidth, hsize))
    print(img.size)    
    img_gray = PIL.ImageOps.invert(img.convert('L'))

    img_color1 = img_gray.point( lambda p: 255 if p >= 64 and p < 128 else 0 ).convert('1').tobytes()
    img_color2 = img_gray.point( lambda p: 255 if p >= 128 and p < 128+64 else 0 ).convert('1').tobytes()
    img_color3 = img_gray.point( lambda p: 255 if p >= 128+64  else 0 ).convert('1').tobytes()

    img_data = b''
    #interleave colors 
    for y in range(img.height) :
        img_data += img_color1[(img.width//8) * y:(img.width//8) * (y+1)]
        img_data += img_color2[(img.width//8) * y:(img.width//8) * (y+1)]
        img_data += img_color3[(img.width//8) * y:(img.width//8) * (y+1)]
    
    #print(img_data)
    w = img.width // 8
    h = img.height * 3
    wL = (w % 256).to_bytes(1,'big')
    wH = (w // 256).to_bytes(1,'big')
    hL = (h % 256).to_bytes(1,'big')
    hH = (h // 256).to_bytes(1,'big')

    
    data = "\x1ba1\x12#\x09\x1dv1p".encode('ascii') +wL + wH + hL + hH + img_data

    open("/tmp/DEVTERM_PRINTER_IN", 'wb').write(data)    
    return data

print_img(sys.argv[1])

Is this still working? And is it working on devterm cm4?