*/
if ( is_callable( array( $this->image, 'getImageAlphaChannel' ) )
&& is_callable( array( $this->image, 'setImageAlphaChannel' ) )
- && defined( Imagick::ALPHACHANNEL_UNDEFINED )
- && defined( Imagick::ALPHACHANNEL_OPAQUE )
+ && defined( 'Imagick::ALPHACHANNEL_UNDEFINED' )
+ && defined( 'Imagick::ALPHACHANNEL_OPAQUE' )
) {
if ( $this->image->getImageAlphaChannel() === Imagick::ALPHACHANNEL_UNDEFINED ) {
$this->image->setImageAlphaChannel( Imagick::ALPHACHANNEL_OPAQUE );