redimensionar IMGs progressivas

Opa galera, situação eh a seguinte, ja testei varios scripts para redimensionar imagens, e nenhum funciona com IMGs progressivas, entendo um pouco de PHP to começando a brincar agora, montar meus proprios scripts e tal...

bom de tanto procurar axei esse script q consegue redimensionar as progressivas e tal, mas nao consegui entender como funciona, como declarar o tamanho da foto etc... alguem poderia dizer como funciona???

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<?php

// --------------------------------------------------------

//

// Title: Progressive Image Switcher - Cropper

// Version: 1.0

//

// Use:

// Change Progessive Images to Non-Progressive Images and Thumbnails

// for Flash applications. This script can also be used to dynamically

// create cropped thumbnails for any application.

//

// Created by: MercuryLevel

// Author: Tony Thomas

// email: tony.thomas@mercurylevel.com

// Aug 4, 2005

//

// Copyright © 2005 Tony Thomas

//

// This program is free software; you can redistribute it and/or

// modify it under the terms of the GNU General Public License

// as published by the Free Software Foundation; either version 2

// of the License, or (at your option) any later version.

//

// This program is distributed in the hope that it will be useful,

// but WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

// GNU General Public License for more details.

//

// You should have received a copy of the GNU General Public License

// along with this program; if not, write to the Free Software

// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

//

//

// -------------------------------------------------------------------------------

//

// Server Requirements:

// Created and tested on Linux Server with PHP 4.3.2 and GD Version 2.0.12

//

// Instructions:

// - Create a blank jpg image the same size as the clipping area, and call it non.jpg

// - Place non.jpg in the same folder and the script calling the fucntion

// - Include the script in your program, and call the function with the imagename and path

// - Set the Clipping area and Thumbnail size fields ($ca and $ts)

// - Results will return a thumbnail image

//

// Limitations of this version:

// This script was only written for Jpeg images, because JPEG images that are progressive

// can not be displayed in Flash applications using ActionScript.

//

// Uses: Great for PHP and Flash projects, Image Galleries, Product Catalogs, etc.

//

// Use as you see fit. Add parameters, functions, other image types, what ever you need for both

// personal or commercial use.

//

// If you use this script or portions of it, please keep the copyright information intact,

// add your comments, updated version number, and please email me the new version. Let me know

// how you used the script. ENJOY!

//

// Tony Thomas - tony.thomas@mercurylevel.com

// http://www.mercurylevel.com

//

// View the General Public Licence at:

// http://www.gnu.org/licenses/gpl.txt

//

// -------------------------------------------------------------------------------

function setImage($ImageFilenPath) {

 

 // set clipping_area

 $ca = 200;

 

 // set thumbnail_size

 $ts = 30;

 

 

 

 

 // only use .jpg's as the source file

 // Source should include image path information relative to the script

 // -------------------------------------------------------------------

 $image_text_name = $ImageFilenPath;

 

 

 

 // Get the name of the JPEG

 // ----------------------------------

 $bs_len = strlen($image_text_name);

 $bs_cut = $bs_len - 4;

 

 

 

 // Create the matching thumbnail image name

 // ----------------------------------

 $newThm = substr($image_text_name,0,$bs_cut) . "_thm.jpg";

 

 

 

 // get the full image, width and height

 // ----------------------------------

 $fullimage = imagecreatefromjpeg($image_text_name);

 $f_width = imagesx($fullimage);

 $f_height = imagesy($fullimage);

 

 

 

 // copy the image and resample for flash, keeping $fullimage for later use

 // ----------------------------------

 $newfull = Imagecreatetruecolor($f_width, $f_height);

 imagecopyresampled($newfull, $fullimage, 0, 0, 0, 0, $f_width, $f_height, $f_width, $f_height);

 imagejpeg($newfull,$image_text_name,100);

 imagedestroy($newfull);

 

 

 

 // check width and height for to see if it is worth clipping from the center

 // anything over 3 pixels of the clipping size (200) will be clipped from the center

 // ----------------------------------

 

 $ay1 = ($f_height - $ca)/2;

 if($ay1 < 2){

 $clip_y = 0;

 } else {

 $clip_y = intval($ay1);

 }

 

 

 $ax1 = ($f_width - $ca)/2;

 if($ax1 < 2){

 $clip_x = 0;

 } else {

 $clip_x = intval($ax1);

 }

 

 

 

 

 // check width and height to see which is larger, then check the smaller for clippable area

 // if not enough pixels to clip then use the smaller size as the basis of the square

 // eg. Width=300 Height=180 Clipping-area=200

 // The result would be a square 180 pixels, later resized to 30

 // ----------------------------------

 

 if($f_width >> $f_height){

 if($f_height >> $ca) {

 $new_width = $ca;

 $new_height = $ca;

 

 } else {

 $new_width = $f_height;

 $new_height = $f_height;

 }

 } else {

 if($f_width >> $ca) {

 $new_width = $ca;

 $new_height = $ca;

 } else {

 $new_width = $f_width;

 $new_height = $f_width;

 }

 }

 

 

 

 

 // use blank non.jpg image (same size as clipping area) as the image to copy to

 // The nice thing about the blank image is that it is resized to fit any smaller images

 // ----------------------------------

 

 $tempImg = imagecreatefromjpeg("non.jpg");

 imagecopy($tempImg, $fullimage, 0, 0, $clip_x, $clip_y, $new_width, $new_height);

 imagejpeg($tempImg,$newThm,100);

 imagedestroy($tempImg);

 imagedestroy($fullimage);

 

 

 

 

 // Create the new thumbnail and resample it for Flash

 // ----------------------------------

 

 $srcImage = imagecreatefromjpeg($newThm);

 $destImage = Imagecreatetruecolor($ts, $ts);

 imagecopyresampled($destImage, $srcImage, 0, 0, 0, 0, $ts, $ts, $new_width, $new_height);

 imagejpeg($destImage,$newThm,100);

 imagedestroy($srcImage);

 imagedestroy($destImage);

 

 return $newThm;

 

}

 

 

$myimage = setImage("test.jpg");

echo "<img src=\"".$myimage."\">";

 

 

 

?>