This Python file converts JPEG to PNG image format.

jpeg_to_png.py

import sys
import os
from PIL import Image

#Directorry input and output
image_folder = sys.argv[1]
output_folder = sys.argv[2]

#check if putput is exist
if not os.path.exists(output_folder):
    os.makedirs(output_folder)

for files in os.listdir(image_folder):
    img = Image.open(f'{image_folder}{files}')
    clean_name = os.path.splitext((files))
    img.save(f'{output_folder}{clean_name}.png','png')
    print('All Done !!')

Need to added resize and thumbnail options