Each of the Image modules does things a little bit differently, and if you have the time, try doing it with IM, and Imager, and see the difference. I prefer Imager myself. Usually in an html program, with it's pictures in tables, you will want to either constrain the thumbnail width or height to give a nice uniform looking table. With Imager you can do something like this:

use Imager;
my $image = Imager->new();

foreach my $pic (@pics){
      $count++;
      my ($basename,$path,$suffix) = fileparse($pic,@exts);

      $image->open(file=>$pic) or die $image->errstr();
#      my $w = $image->getwidth(); 
#      my $h = $image->getheight(); 

      # Create smaller version 
      my $thumb = $image->scale(xpixels=>100);

      #$basename.="-t$suffix"; #keeps same ext 
      $basename.='-t.jpg'; #make all thumbs as jpg 
      print "Storing image as: $basename\n";
      $thumb->write(file=>$basename, jpegquality=>30) or die $thumb->e
+rrstr;
#      my $tw = $thumb->getwidth(); 
#      my $th = $thumb->getheight(); 

}
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