(PECL imagick 2, PECL imagick 3)
Imagick::setImageMatte — Sets the image matte channel
$matte
): boolSets the image matte channel. This method is available if Imagick has been compiled against ImageMagick version 6.2.9 or newer.
matte
True activates the matte channel and false disables it.
Returns true
on success.