(PECL imagick 2, PECL imagick 3)
Imagick::setImageChannelDepth — Sets the depth of a particular image channel
public Imagick::setImageChannelDepth ( int $channel , int $depth ) : bool
Sets the depth of a particular image channel.
channel
depth
Returns true on success.
Throws ImagickException on error.
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https://www.php.net/manual/en/imagick.setimagechanneldepth.php