JPG to PNG converter in python with pillow

jpg2png.py

#!/usr/bin/env python3

import click
import PIL.Image

@click.command()
@click.argument('input', type=click.Path(exists=True, dir_okay=False))
@click.argument('output', type=click.Path(exists=False))
def main(input, output):
    img = PIL.Image.open(input)
    img.save(output)


if __name__ == '__main__':
    main()