As the name suggests, this allows you to adjust the hue,
saturation, value and lightness of the image. Increasing saturation makes colors more
vivid, reducing it makes the image tend towards monochrome (black and white).
Adjusting hue changes the colors in the image, value affect intensity and lightness affects brightness. Note that you can only work with either the value (HSV) or lightness (HSL) at a time.
