label_printer/format_image.py

from PIL import Image
from printer_info import *

def format_image_to_label(path):
    image = Image.open(path)
    image = image.rotate(-90, expand=True)
    
    new_image = Image.new('1', (printer_width, image.height), 1)
    new_image.paste(image, (0, 0))

    return new_image

def format_image(path):
    image = Image.open(path)

    if (image.height != label_width):
        print("resizing image")
        new_height = label_width
        new_width = int(label_width * image.width / image.height)

        image = image.resize((new_width, new_height))
    
    image = image.convert('1', dither=Image.FLOYDSTEINBERG)
    return image
    

format_image("static/uploads/upload.png").save("output.png")