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- import argparse
- from PIL import Image, ImageOps
- # Specify two command line arguments
- parser = argparse.ArgumentParser(description="Convert to greyscale")
- parser.add_argument('input_file', help="Image to convert")
- parser.add_argument('output_file', nargs='?', default=None,
- help="Output image. Replaces input if not specified")
- # Parse arguments, setting output=input if not given
- args = parser.parse_args()
- if args.output_file is None:
- args.output_file = args.input_file
- # Convert input to greyscale
- with Image.open(args.input_file) as im:
- grey = ImageOps.grayscale(im)
- # Save converted image
- grey.save(args.output_file)
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