Usage of Color Picker:
- Click and drag on the color wheel
- Drag RGB or brightness slider
- Enter a numerical value [0-255] into textfields
The two color spots in the middle show the initial color (top) and the
current color (bottom).
- To reset the color click on the initial color.
Use the brightness slider to lighten or darken a color. The brightness
value is set to 100% when another color slider is modified. The brightness
value remains if a new color is selected from the color wheel, this allows to
browse through darker colors.
