(PECL imagick 3 >= 3.3.0)
Imagick::setImageBiasQuantum — Description
This function has been DEPRECATED as of Imagick 3.4.4. Relying on this function is highly discouraged.
public Imagick::setImageBiasQuantum ( string $bias ) : void
This function is currently not documented; only its argument list is available.
bias
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https://www.php.net/manual/en/imagick.setimagebiasquantum.php