php - image resizing png adding black colour in background -

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i resizing images using code below, problem resizing png images transparent background fills background black color.

below full code of image resizing:

function store_uploaded_image($html_element_name, $new_img_width, $new_img_height ,$size ,$target_dir) {         $target_file = $target_dir .'image-'.$size.'.png';       $image = new simpleimage();     $image->load($_files[$html_element_name]['tmp_name']);     $image->resize($new_img_width, $new_img_height);     $image->save($target_file);     return $target_file; //return name of saved file in case want store in database or show confirmation message user }   class simpleimage {     var $image;    var $image_type;     function load($filename) {        $image_info = getimagesize($filename);       $this->image_type = $image_info[2];       if( $this->image_type == imagetype_jpeg ) {           $this->image = imagecreatefromjpeg($filename);       } elseif( $this->image_type == imagetype_gif ) {           $this->image = imagecreatefromgif($filename);       } elseif( $this->image_type == imagetype_png ) {           $this->image = imagecreatefrompng($filename);       }    }    function save($filename, $image_type=imagetype_png, $compression=75, $permissions=null) {        if( $image_type == imagetype_jpeg ) {          imagejpeg($this->image,$filename,$compression);       } elseif( $image_type == imagetype_gif ) {           imagegif($this->image,$filename);       } elseif( $image_type == imagetype_png ) {           imagepng($this->image,$filename);       }       if( $permissions != null) {           chmod($filename,$permissions);       }    }    function output($image_type=imagetype_jpeg) {        if( $image_type == imagetype_jpeg ) {          imagejpeg($this->image);       } elseif( $image_type == imagetype_gif ) {           imagegif($this->image);       } elseif( $image_type == imagetype_png ) {           imagepng($this->image);       }    }    function getwidth() {        return imagesx($this->image);    }    function getheight() {        return imagesy($this->image);    }    function resizetoheight($height) {        $ratio = $height / $this->getheight();       $width = $this->getwidth() * $ratio;       $this->resize($width,$height);    }     function resizetowidth($width) {       $ratio = $width / $this->getwidth();       $height = $this->getheight() * $ratio;       $this->resize($width,$height);    }     function scale($scale) {       $width = $this->getwidth() * $scale/100;       $height = $this->getheight() * $scale/100;       $this->resize($width,$height);    }     function resize($width,$height) {       $new_image = imagecreatetruecolor($width, $height);       imagecopyresampled($new_image, $this->image, 0, 0, 0, 0, $width, $height, $this->getwidth(), $this->getheight());       $this->image = $new_image;    }        }

edit:

as @marc b suggested, using imagealphablending , imagesavealpha before imagecopyresampled made work.

imagealphablending( $targetimage, false ); imagesavealpha( $targetimage, true );


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