3) look into the example code towards the end, it uses this lib to do the image transformation

just change the image sizes and play with it.
e.g change 80, 80 to say 100, 120 in following
transformImg($path, $directory.'/new/'.$file, 80, 80);

to run it use on command prompt or call it via some url
php imgTrns.php

4) Put some images in $directory and you will see new images of modified width and height

Example code : save file as imgTrns.php

================

include_once 'Image/Transform.php';

$directory = "../images/gifts";
$directory_list = opendir($directory);

// and scan through the items inside
while (FALSE !== ($file = readdir($directory_list)))
{
// if the filepointer is not the current directory
// or the parent directory
if($file != '.' && $file != '..')
{
// we build the new path to scan
$path = $directory.'/'.$file;
if(stripos($file, 'icon')!==false)
{
transformImg($path, $directory.'/new/'.$file, 80, 80);
}
else
{
transformImg($path, $directory.'/new/'.$file, 400, 400);
}
}
}

function transformImg($src, $dest, $wt, $ht)
{
  $image = Image_Transform::factory('GD');
  if (PEAR::isError($image))
  {
   echo "Upload error1: " . $image->getMessage()."<br/>".$image->getDebugInfo();
   exit;
  }

  $imgFile = $image->load($src);
  if (PEAR::isError($imgFile))
  {
   echo "Upload error2: " . $imgFile->getMessage()."<br/>".$imgFile->getDebugInfo();
  }
  else
  {
    $image->fit($wt, $ht);
    $image->save($dest);
  }
}
?>

===========

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