Şu an arka plan siyahtır. Beyaz olması için rengini değiştirmek nasıl?

    #assuming the mime type is correct
    switch ($imgtype) {
        case 'image/jpeg':
            $source = imagecreatefromjpeg($source_image);
            break;
        case 'image/gif':
            $source = imagecreatefromgif($source_image);
            break;
        case 'image/png':
            $source = imagecreatefrompng($source_image);
            break;
        default:
            die('Invalid image type.');
    }

    #Figure out the dimensions of the image and the dimensions of the desired thumbnail
    $src_w = imagesx($source);
    $src_h = imagesy($source);


    #Do some math to figure out which way we'll need to crop the image
    #to get it proportional to the new size, then crop or adjust as needed

    $width  = $info[0];
    $height = $info[1];

    $x_ratio = $tn_w / $src_w;
    $y_ratio = $tn_h / $src_h;

    if (($x_ratio * $height) < $tn_w) {
        $new_h = ceil($x_ratio * $height);
        $new_w  = $tn_w;
    } else {
        $new_w  = ceil($y_ratio * $width);
        $new_h = $tn_h;
    }  
        $x_mid  = $new_w / 2;
        $y_mid  = $new_h / 2;   

    $newpic = imagecreatetruecolor(round($new_w), round($new_h));
    imagecopyresampled($newpic, $source, 0, 0, 0, 0, $new_w, $new_h, $src_w, $src_h);
    $final = imagecreatetruecolor($tn_w, $tn_h);
    imagecopyresampled($final, $newpic, 0, 0, ($x_mid - ($tn_w / 2)), ($y_mid - ($tn_h / 2)), $tn_w, $tn_h, $tn_w, $tn_h);


    #if we need to add a watermark
    if ($wmsource) {
        #find out what type of image the watermark is
        $info    = getimagesize($wmsource);
        $imgtype = image_type_to_mime_type($info[2]);

        #assuming the mime type is correct
        switch ($imgtype) {
            case 'image/jpeg':
                $watermark = imagecreatefromjpeg($wmsource);
                break;
            case 'image/gif':
                $watermark = imagecreatefromgif($wmsource);
                break;
            case 'image/png':
                $watermark = imagecreatefrompng($wmsource);
                break;
            default:
                die('Invalid watermark type.');
        }

        #if we're adding a watermark, figure out the size of the watermark
        #and then place the watermark image on the bottom right of the image
        $wm_w = imagesx($watermark);
        $wm_h = imagesy($watermark);
        imagecopy($final, $watermark, $tn_w - $wm_w, $tn_h - $wm_h, 0, 0, $tn_w, $tn_h);

    }
    if (imagejpeg($final, $destination, $quality)) {
        return true;
    }
    return false;
}

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