Adjust the Colours of either the back or foreground to see how they work together in your particular application.
Most of the functions are fairly obvious. You can:-

• Click on the main color ramp and it updates the colors
• Click on the graduated to white or black ramp to raise or lower the tone
• Type either hex or RGB values into either of the text fields
  The colors will be updated accordingly. This works like a Hex converter, so you can insert either type of value in the appropriate field.
• Move the sliders to adjust the various colors
• Type a value in the text field next to the slider to adjust the color

The Applet presents the color values in either hex or [Red , Green , Blue] values these can then be simply highlighted in the text area, using your mouse. Then cut the figures into your computers clipboard using what ever technique is suitable in your operating environment (in Windows press the Ctl and the C key together). Once in the clipboard you can paste the figures in the appropriate place as Parameters for other applets or applications.

As you can see the are Three types of background colors, light medium and dark, choose whichever is representation appropriate to you. These represent the highlight or lowlight versions of the colors. Different components use one of these.