(PECL gmagick >= Unknown)
GmagickPixel::setcolorvalue — Sets the normalized value of one of the channels
public GmagickPixel::setcolorvalue ( int $color , float $value ) : GmagickPixel
Sets the value of the specified channel of this object to the provided value, which should be between 0 and 1. This function can be used to provide an opacity channel to a GmagickPixel object.
color
One of the Gmagick channel color constants.
value
The value to set this channel to, ranging from 0 to 1.
The GmagickPixel object on success.
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https://www.php.net/manual/en/gmagickpixel.setcolorvalue.php