(PECL gmagick >= Unknown)
Gmagick::setimagechanneldepth — Sets the depth of a particular image channel
public Gmagick::setimagechanneldepth ( int $channel , int $depth ) : Gmagick
Sets the depth of a particular image channel.
channel
Identify which channel to extract: RedChannel, GreenChannel, BlueChannel, OpacityChannel, CyanChannel, MagentaChannel, YellowChannel, BlackChannel.
depth
The image depth in bits.
The Gmagick object on success
Throws an GmagickException on error.
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https://www.php.net/manual/en/gmagick.setimagechanneldepth.php