QUESTION Upload png image

[shawn_a]

replace and add these functions to admin/inc/imagemanipulation.php

PHP Code:

    /**
     * Private method to run the imagecopyresampled() function with the parameters that have been set up.
     * This method is used by the save() and show() methods.
     */
    private function createResampledImage()
    {
        /* change ImageCreateTrueColor to ImageCreate if your GD not supported ImageCreateTrueColor function*/
        if ( isset($this->image["sizex_thumb"]) && isset($this->image["sizey_thumb"]) ) {        
            $this->image["des"] = ImageCreateTrueColor($this->image["sizex_thumb"], $this->image["sizey_thumb"]);
            $this->preserveAlpha();            
            imagecopyresampled($this->image["des"], $this->image["src"], 0, 0, $this->image["targetx"], $this->image["targety"], $this->image["sizex_thumb"], $this->image["sizey_thumb"], $this->image["sizex"], $this->image["sizey"]);
        } else {
            $this->image["des"] = ImageCreateTrueColor($this->image["sizex"], $this->image["sizey"]);
            $this->preserveAlpha();            
            imagecopyresampled($this->image["des"], $this->image["src"], 0, 0, $this->image["targetx"], $this->image["targety"], $this->image["sizex"], $this->image["sizey"], $this->image["sizex"], $this->image["sizey"]);
        }    
    }
    
    /**
     * preserve alpha channel
     * @return boolean true:enable transparency alpha blending
     */
    private function preserveAlpha($bool=true){
        imagealphablending($this->image["des"], !$bool);
        imagesavealpha($this->image["des"], $bool);        
    } 


the preserveAlpha calls being the fix