(PECL imagick 2 >= 2.1.0, PECL imagick 3)
Imagick::setImageAlphaChannel — Sets image alpha channel
public Imagick::setImageAlphaChannel ( int $mode ) : bool
Activate or deactivate image alpha channel. The mode
is one of the Imagick::ALPHACHANNEL_*
constants. This method is available if Imagick has been compiled against ImageMagick version 6.3.8 or newer.
mode
One of the Imagick::ALPHACHANNEL_*
constants
Returns true
on success.
Throws ImagickException on error.
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https://www.php.net/manual/en/imagick.setimagealphachannel.php