(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 One of the Channel constant (Gmagick::CHANNEL_*).
depthThe image depth in bits.
The Gmagick object.
Throws an GmagickException on error.
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https://www.php.net/manual/en/gmagick.setimagechanneldepth.php