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#!/usr/bin/perl -w
use Image::Magick;
...

system("convert -size 500x180  $file -auto-orient -thumbnail 250x90   
+-unsharp 0x.5  $rfile");
system(@cmd) == 0 or die "Couldn't launch [@cmd]: $!/$?";

convert,: not found
thumbnail.gif: not found
Syntax error: word unexpected (expecting ")")
...
               -compose Copy_Opacity
               -composite
            ], thumbnail2.png]: No such file or directory/512 at ./IMT
+est33.pl line 26.