(PECL gmagick >= Unknown)
Sets the depth of a particular image channel
public Gmagick Gmagick::setimagechanneldepth ( int $channel, int $depth )
Sets the depth of a particular image channel.
Parameters:
channel
Identify which channel to extract: RedChannel, GreenChannel, BlueChannel, OpacityChannel, CyanChannel, MagentaChannel, YellowChannel, BlackChannel.