Image Comparison Utility (Version 4.2.9).
Copyright (c) 2001 Michael David Adams.
All rights reserved.

For information about the JasPer project, see:
    https://jasper-software.github.io/jasper
    https://www.ece.uvic.ca/~mdadams/jasper
For online documentation on the JasPer software, see:
    https://jasper-software.github.io/jasper-manual
Please submit bug reports using the bug-tracker at:
    https://github.com/jasper-software/jasper/issues

usage: /usr/bin/imgcmp [options]

Some of the supported options include:
    -f $file
        Set the pathname of reference image file to $file.
    -F $other_image_file
        Set pathname of the other image file to $file.
    -m $metric
        Set the metric to $metric.
For additional information, please see the online documentation.

The metric specifier may assume one of the following values:
    psnr .... peak signal to noise ratio
    mse ..... mean squared error
    rmse .... root mean squared error
    pae ..... peak absolute error
    mae ..... mean absolute error
    equal ... equality (boolean)