(PECL imagick 2 >= 2.3.0, PECL imagick 3)
Imagick::getImageAlphaChannel — Checks if the image has an alpha channel
Returns whether the image has an alpha channel.
Diese Funktion besitzt keine Parameter.
Returns true
if the image has an alpha channel value and false
if not,
i.e. the image is RGB rather than RGBA
or CMYK rather than CMYKA.
Wirft ImagickException bei Fehlern.