Наложение на изображение маски

    public function makeMask()
    {
        $path = $this->ImageDirPath() . $this->id . $this->image;
        $mask = imagecreatefrompng( "images/mask.png" );
        $source = imagecreatefromjpeg( "images/" . get_class($this) . "/" . $this->id . $this->image);
        self::imagealphamask( $source, $mask );
        imagepng($source, "images/" . get_class($this) . "/" . $this->id . $this->image . '.png');
    }
    protected static function  imagealphamask( &$picture, $mask )
    {
        $xSize = imagesx( $picture );
        $ySize = imagesy( $picture );
        $newPicture = imagecreatetruecolor( $xSize, $ySize );
        imagesavealpha( $newPicture, true );
        imagefill( $newPicture, 0, 0, imagecolorallocatealpha( $newPicture, 0, 0, 0, 127 ) );
 
        if( $xSize != imagesx( $mask ) || $ySize != imagesy( $mask ) ) {
            $tempPic = imagecreatetruecolor( $xSize, $ySize );
            imagecopyresampled( $tempPic, $mask, 0, 0, 0, 0, $xSize, $ySize, imagesx( $mask ), imagesy( $mask ) );
            imagedestroy( $mask );
            $mask = $tempPic;
        }
 
        for( $x = 0; $x < $xSize; $x++ ) {
            for( $y = 0; $y < $ySize; $y++ ) {
                $alpha = imagecolorsforindex( $mask, imagecolorat( $mask, $x, $y ) );
                $alpha = 127 - floor( $alpha[ 'red' ] / 2 );
                $color = imagecolorsforindex( $picture, imagecolorat( $picture, $x, $y ) );
                imagesetpixel( $newPicture, $x, $y, imagecolorallocatealpha( $newPicture, $color[ 'red' ], $color[ 'green' ], $color[ 'blue' ], $alpha ) );
            }
        }
 
        imagedestroy( $picture );
        $picture = $newPicture;
    }