public function create( $width, $height, $trueColor = TRUE, $alpha = 0 )
	{
		$resource	= $trueColor ? imagecreatetruecolor( $width, $height ) : imagecreate( $width, $height );
		$this->type	= $trueColor ? IMAGETYPE_PNG : IMAGETYPE_GIF;
		$this->setResource( $resource, $alpha );
	}