(PECL imagick 2.0.0)
Imagick::getImageChannelDepth — Gets the depth for a particular image channel
Gets the depth for a particular image channel.
Provide any channel constant that is valid for your channel mode. To apply to more than one channel, combine channel constants using bitwise operators. Defaults to Imagick::CHANNEL_DEFAULT. Refer to this list of channel constants
Returns TRUE on success.