Moving the H slider down will cycle the color wheel through violet, blue, cyan, green, yellow and orange. A small sample of the pure color appears above the H slider. Saturation is a measure of color purity. The top of the S slider represents the pure color as defined by the hue. Moving the slider down reduces the amount color and increases the amount of gray.
Value is another term for brightness .
The top of the V slider will make the color as bright as it can be. The bottom of the slider is black. Andy J Turner. All rights reserved.