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  1. or download this
      use Image::Magick;
  ...
...
    $newheight = ($height*$newwidth)/$width;
    $image->Scale('width'=>$newwidth,'height'=>$newheight);
  }
  2. or download this
      # Adjust Resolution if necessary
  $image->SetAttribute('units'=>'PixelsPerInch');
...
  if ($xrez > 72 || $yrez > 72) {
    $image->SetAttribute('density'=>'72x72');
  }
  3. or download this
    x-resolution is 300
y-resolution is 300
  4. or download this
    x-resolution is 72
y-resolution is 72