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