This works for me just fine using GD.

#! perl -w
use GD;

my $source = 'meat.jpg';
my $Thumbnail = 'thumb_' . "$source";

my $maxheight = 150;
my $maxwidth = 150;
my $srcimage = GD::Image->newFromJpeg("$source");
my ($srcW,$srcH) = $srcimage->getBounds();
my $wdiff = $srcW - $maxwidth;
my $hdiff = $srcH - $maxheight;
my $newH; my $newW;

if ($wdiff > $hdiff) {
      $newW = $maxwidth;
      $aspect = ($newW/$srcW);
      $newH = int($srcH * $aspect);
  } else {
      $newH = $maxheight;
      $aspect = ($newH/$srcH);
      $newW = int($srcW * $aspect);
 }

  print "converting $srcW:$srcH to $newW:$newH\n";

  my $newimage = new GD::Image($newW,$newH);
  $newimage->copyResized($srcimage,0,0,0,0,$newW,$newH,$srcW,$srcH);
open(FILE, ">$Thumbnail") || die "Cannot open $Thumbnail : $!\n";
binmode (FILE); #-- ONLY FOR WINDOWS --#
print FILE $newimage->jpeg;
[download]

-Silent11