resize di immagini jpg

[_kime_]

se è questo a cui ti riferisci...ecco cosa avevo trovato

<?
    /*
    * $img = new Thumbnail();
    * echo $img->create_tag("../images/photos/sunflower.jpg");
    */
    class Thumbnail
    {
        /*
        * e.g. '/usr/local/apache/htdocs/images/thumbnails'
        */
        var $thumbnail_dir_internal  =  '';

        /*
        * e.g. '/images/thumbnails'
        */
        var $thumbnail_dir_external  =  '';

        // Larghezza & Altezza
        var $max_width               =  120;
        var $max_height              =  120;
        
        var $image_name;
        var $image_tag;
        var $error;
        var $width;
        var $height;


        function Thumbnail ()
        {
            global $_CONFIG;

            if (!empty($_CONFIG['thumbnail_dir_internal']))
            {
                $this->thumbnail_dir_internal  =  $_CONFIG['thumbnail_dir_internal'];
            }
            if (!empty($_CONFIG['thumbnail_dir_external']))
            {
                $this->thumbnail_dir_external  =  $_CONFIG['thumbnail_dir_external'];
            }
        }

        function create_name ( $parameter = '' )
        {
            $this->create( $parameter );
            return $this->image_name;
        }

        function create_tag ( $parameter = '' )
        {
            $this->create( $parameter );
            return $this->image_tag;
        }

        function create ( $imagefile )
        {
            if (strlen($this->thumbnail_dir_internal)  &&  (substr($this->thumbnail_dir_internal, -1) != '/'))
            {
                $this->thumbnail_dir_internal  .=  '/';
            }
            if (strlen($this->thumbnail_dir_external)  &&  (substr($this->thumbnail_dir_external, -1) != '/'))
            {
                $this->thumbnail_dir_external  .=  '/';
            }
            $tmp_name  =  basename($imagefile);
            if (strtolower(substr($tmp_name, -4)) == '.jpg')
            {
                $this->image_name  =  substr($tmp_name, 0, -4) . '.png';
                if (!is_file($this->thumbnail_dir_internal . $this->image_name))
                {
                    $old    =  ImageCreateFromJPEG($imagefile);
                    $old_w  =  ImageSX($old);
                    $old_h  =  ImageSY($old);
                    $this->width   =  $old_w;
                    $this->height  =  $old_h;
                    if ($this->max_width  &&  ($this->width > $this->max_width))
                    {
                        $this->height  =  round($this->height * $this->max_width / $this->width);
                        $this->width   =  $this->max_width;
                    }
                    if ($this->max_height  &&  ($this->height > $this->max_height))
                    {
                        $this->width   =  round($this->width * $this->max_height / $this->height);
                        $this->height  =  $this->max_height;
                    }
                    $new  =  imagecreate($this->width, $this->height);
                    imagecopyresized($new, $old, 0,0, 0,0, $this->width, $this->height, $old_w, $old_h);
                    ImageJPEG($new, $this->thumbnail_dir_internal . $this->image_name);
                    ImageDestroy($new);
                    ImageDestroy($old);
                }
                else
                {
                    $arr  =  getimagesize($this->thumbnail_dir_internal . $this->image_name);
                    $this->width   =  $arr[0];
                    $this->height  =  $arr[1];
                }
                $this->image_tag  =  '<IMG SRC="' . $this->thumbnail_dir_external . $this->image_name 
                                   . '" WIDTH="'  . $this->width
                                   . '" HEIGHT="' . $this->height
                                   . '" BORDER="0">';
            }
            else
            {
                $this->error  =  "Filetype not JPG";
            }
        }
    }

?>