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  1. or download this
     compare -metric mae image.png reference.png difference.png
  2. or download this
    Errors is 3156.326700
Mean Error is 0.026116
  3. or download this
    #!/usr/bin/perl
use warnings;
...

printf "Errors is %f\n",     $i1->Get('error');
printf "Mean Error is %f\n", $i1->Get('mean-error');
  4. or download this
    #!/usr/bin/perl
use warnings;
...
     );
$i1->Write("$0-diff-compose.png");