Image to badge shitty script, with script helper for uploading it directly on the badge via USB

troopers2019_img2badge.py

#!/usr/bin/env python3
# TROOPERS2019
# @doegox
# The script will resize the image and convert it to BW image if needed but
# I would advise to do it yourself first with e.g. Gimp for a better control
# of the aspect ration and the BW threshold.
# Target: 296x128, black & white (no grey)


# Shall we display the result locally?
PREVIEW_ONLY=False

import sys
from PIL import Image

DST_WIDTH=296
DST_HEIGHT=128

def data2img(d):
    img = Image.new( '1', (DST_WIDTH, DST_HEIGHT), "white")
    pixels = img.load()
    for i in range(img.size[0]//8):
        for j in range(img.size[1]):
            for k in range(8):
                pixels[i*8+k,j] = (not (d[int(i+j*DST_WIDTH//8)]>>(7-k) & 1))
    return img

def img2data(img):
    if img.size[0] != DST_WIDTH or img.size[1] != DST_HEIGHT:
        print("Resizing image...")
        img = img.resize((DST_WIDTH,DST_HEIGHT))
    if img.mode != '1':
        print("Converting image...")
        img = img.convert("1")
    d=[0]*(img.size[0]//8*img.size[1])
    pixels = img.load()
    for i in range(img.size[0]//8):
        for j in range(img.size[1]):
            for k in range(8):
                d[int(i+j*DST_WIDTH//8)] |= (not pixels[i*8+k,j]) << (7-k)
    return d

if __name__ == '__main__':
    if len(sys.argv) >= 2 and sys.argv[1] == "-p":
        PREVIEW_ONLY=True
        sys.argv.pop(0)
    if len(sys.argv) < 2:
        print(f"""
Usages:
  - preview:
    {sys.argv[0]} -p myfile.png

  - online: requires the Troopers badge server which was present on site during the event.
    {sys.argv[0]} myfile.png

      It will return a large table.
      Visit https://badge.troopers.de/name/ and copy/paste the table in its Local Storage
        then upload it to the canvas.

  - offline: requires the file config.json of the badge.
    {sys.argv[0]} myfile.png config.json

      It will update config.json.
""")
        sys.exit(1)
    img = Image.open(sys.argv[1])
    d = img2data(img)

    if PREVIEW_ONLY:
        data2img(d).show()
        sys.exit(0)

    if len(sys.argv) < 3:
        print(d)
    else:
        import json
        import base64
        with open(sys.argv[2], "r") as f:
            j = json.load(f)
        # Old image:
        #data2img(base64.b64decode(j['IMAGE'])).show()
        # New image:
        j['IMAGE'] = base64.b64encode(bytes(d)).decode('utf8')
        with open(sys.argv[2], "w") as f:
            json.dump(j, f)

troopers2019_img2badge_offline.sh

#!/bin/bash

# TROOPERS2019
# @doegox
# The script will resize the image and convert it to BW image if needed but
# I would advise to do it yourself first with e.g. Gimp for a better control
# of the aspect ration and the BW threshold.
# Target: 296x128, black & white (no grey)

export AMPY_PORT=${AMPY_PORT:-/dev/ttyUSB0}
export AMPY_BAUD=115200

IMG=$1
if ! which ampy >dev>null 2>&1; then
    echo "\"ampy\" not found, please install it, e.g.:"
    echo "python3 -m pip install --user adafruit-ampy"
    exit 1
fi
if [ "$IMG" == "" ]; then
    echo "Usage: $0 myfile.png"
    echo "It requires the badge to be connected"
    echo "Adapt AMPY_PORT if needed, depending on your OS"
    exit 1
fi

# Connect the badge, "reset" and keep "start" pressed till the "name" screen appears

echo "Retrieving config.json..."
ampy get config.json > config.json
./troopers2019_img2badge.py $IMG config.json
echo "Uploading config.json..."
ampy put config.json
echo "Done. Reset your badge and keep \"start\" pressed"

Nice job, thx! I collected my first steps with the badge here https://github.com/ThetaGamma/Troopers19_Badge and referenced you.