saturation value without hue or lightness?

[BabaG]

can saturation be corrected without having to send hue and lightness corrections?
if i only want to desaturate an image, must i still send all three -hls values , or, is
there a way to just send the saturation value?

thanks,
BabaG

[xnview]

You can use -hls 0 value 0