Monochromer

import sys
from PIL import Image

def convert_to_grayscale_bmp(input_path, output_path):
    img = Image.open(input_path)
    grayscale_img = img.convert('L')
    grayscale_img.save(output_path, 'BMP')

input_file = sys.argv[1]
output_file = input_file.strip(".jpg") + ".bmp"

convert_to_grayscale_bmp(input_file, output_file)