(PECL imagick 3 >= 3.3.0)
Imagick::clampImage — Description
public Imagick::clampImage ([ int $channel = Imagick::CHANNEL_DEFAULT ] ) : bool
Restricts the color range from 0 to the quantum depth.
channel
Returns true on success or false on failure.
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https://www.php.net/manual/en/imagick.clampimage.php