Librerie GD

[Rossella_75]

grazie mille, utilizzo questa classe

<?PHP 

class Image{ 

    var $src_filename; 

    var $src_witdh; 

    var $src_height; 

    var $src_type; 

    var $src_attr; 

    var $src_image;   



    function Image($filename){ 

        $this->src_filename = $filename; 

        $this->GetImageInfo(); 

    } 



    function GetImageInfo(){ 

        list($this->src_width,$this->src_height, $this->src_type, $this->src_attr) = getimagesize($this->src_filename); 

    } 



    function CreateSourceImage(){ 

        switch($this->src_type){ 

            case 1: 

                $this->src_image =imagecreatefromgif($this->src_filename); 

                   break; 

            case 2: 

                $this->src_image =imagecreatefromjpeg($this->src_filename); 

            break; 

            case 3: 

                $this->src_image =imagecreatefrompng($this->src_filename); 

            break; 

            default:    return false; 

        } 



        return true; 

    } 



    function SaveProportionateImage($filename, $quality, $height, $width){ 

        $dest_height = $height; 

        $ratio = $this->src_height / $dest_height; 

        /*
        IN PROPORZIONE
        $dest_image = imagecreatetruecolor( $this->src_width / $ratio,$dest_height); 
        */
        $dest_image = imagecreatetruecolor($width, $height); 

        imagecopyresampled($dest_image, $this->src_image, 0, 0, 0, 0, 

            $this->src_width / $ratio, 

            $this->src_height / $ratio, 

            $this->src_width, 

            $this->src_height); 

        imagejpeg($dest_image, $filename.'.jpg', $quality); 

        imagedestroy($dest_image); 

    } 



    function Free(){ 

        imagedestroy($this->src_image); 

    } 

}

e leggendo la guida devo impostare imageinterlace() ma non riesco a capire quadno...
mi sapreste aiutare?
grazie ancora