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ImageMagick

if($imgsize['mime']=='image/png'){
                    $src = ImageCreateFromPng($image);
                    $dst=ImageCreateTrueColor($tn_width, $tn_height);

                    $black = imagecolorallocate($dst, 0, 0, 0);
                    imagecolortransparent($dst, $black);
                    imagealphablending($dst, false);
                    imageSaveAlpha($dst, true);
                    imagecopyresampled($dst, $src, 0, 0, 0, 0, $tn_width, $tn_height, $width, $height);
                    if(isset($this->query[1]) AND $this->query[1]='preview') {
                       $copy = ImageCreateFromPng('image/copy.png');
                        imagealphablending($dst, true);
                        imagecopyresampled($dst, $copy, $tn_width - 125, $tn_height - 35, 0, 0, 125, 35, 125, 35);
                        ImageDestroy($copy);
                    }

                    header("Content-type: image/png");
                    ImagePng($dst, null);
                    ImageDestroy($src);
                    ImageDestroy($dst);
                }