(PECL imagick 2, PECL imagick 3)
Imagick::getImageMatte — Return if the image has a matte channel
This function has been DEPRECATED as of Imagick 3.4.4. Relying on this function is highly discouraged.
public Imagick::getImageMatte ( ) : bool
Returns true if the image has a matte channel otherwise false. This method is available if Imagick has been compiled against ImageMagick version 6.2.9 or newer.
Returns true on success.
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https://www.php.net/manual/en/imagick.getimagematte.php