usage: diff.py [-h] [-O OUTPUT] [-f FILTER [FILTER ...]] [-a FILTER_ARGUMENT]
           [-p PERCENT_DIFF] [-r RADIUS] [-o OUTPUT_PIXEL_FILTER] [-i]
           [-v]
           input


  positional arguments:
    input


  optional arguments:
    -h, --help            show this help message and exit
    -O OUTPUT, --output OUTPUT
    -f FILTER [FILTER ...], --filter FILTER [FILTER ...]
    -a FILTER_ARGUMENT, --filter-argument FILTER_ARGUMENT
    -p PERCENT_DIFF, --percent-diff PERCENT_DIFF
    -r RADIUS, --radius RADIUS
    -o OUTPUT_PIXEL_FILTER, --output-pixel-filter OUTPUT_PIXEL_FILTER
    -i, --invert
    -v, --verbose