print image files to thermal printer ESC-POS on stdout

esc-pos-image.py

#!/usr/bin/env python3
# esc-pos-image.py - print image files given as command line arguments
#                    to simple ESC-POS image on stdout
# scruss - 2014-07-26 - WTFPL (srsly)
#        - 2021-01-09 (made python3 compatible - tvm Carko!)

# if you want a proper CUPS driver for a 58mm thermal printer
# that uses this command set, go here:
#            https://github.com/klirichek/zj-58

import sys
from PIL import Image
import PIL.ImageOps
import struct

# give usage and exit if no arguments
if (len(sys.argv) == 1):
    print('Usage:', sys.argv[0],
          'image1 image2 ... [ > printer_device ]')
    exit(1)

# print all of the images!
for i in sys.argv[1:]:
    im = Image.open(i)

    # if image is not 1-bit, convert it
    if (im.mode != '1'):
        im = im.convert('1')

    # if image width is not a multiple of 8 pixels, fix that
    if (im.size[0] % 8):
        im2 = Image.new('1', (im.size[0] + 8 - im.size[0] % 8,
                              im.size[1]), 'white')
        im2.paste(im, (0, 0))
        im = im2

    # Invert image, via greyscale for compatibility
    #  (no, I don't know why I need to do this)
    im = PIL.ImageOps.invert(im.convert('L'))
    # ... and now convert back to single bit
    im = im.convert('1')

    # output header (GS v 0 \000), width, height, image data
    sys.stdout.buffer.write(b''.join((bytearray(b'\x1d\x76\x30\x00'),
                                      struct.pack('2B', int(im.size[0] / 8) % 256,
                                                  int(im.size[0] / (8 * 256))),
                                      struct.pack('2B', im.size[1] % 256,
                                                  int(im.size[1] / 256)),
                                      im.tobytes())))

explanation here: Notes on mini-printers and Linux … but these days, you probably want to use the klirichek/zj-58 driver.

what license is this?
thanx for wonderfull software. saved me a headache on a home photobooth :-)

This is the licence: WTFPL.

Very lovely! Worked like nothing has ever have before in blueooth.

Very lovely! Worked like nothing has ever have before in bluetooth.

Glad you like it! One day I'll update it to Python 3, but the bytes vs utf8 bit seems like work

I made some changes to make it work with Pyton 3: https://gist.github.com/Carko/1507260d13eaa3e7cea6cecb713caca0

Much appreciated, Carko!