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sub thumbnail{
        # receives:
        #       file source (absolute path on machine)
...
}

$image_in=$ENV{DOCUMENT_ROOT}.'/img/1.jpg'; #example, might have ENV D
+OC ROOT on your server, need full pathof some sort though
$image_out=$ENV{DOCUMENT_ROOT}.'/img/.thumb.1.jpg'; #whatever you want
+ to call it. 

thumbnail($image_in, $image_out,80,'square',90);