Colors can be specified using named colors like 'DarkRed', '0x00FF00', and Color.GREEN. A GUI is provided to select colors, and they are stored as r,g,b values so that most any color can be used.

Colors can also have a transparency (alpha channel) specified. The GUI provides a control for this. Transparent colors are mixed with the colors already painted. This is used for example with events bars, and can be useful when overlaying dense data.

When a color is stored in the .vap file, it will be stored by name and by RGB value. For example, the string "0x0000FF (Blue)" allows the name identity to be kept for reference, but the RGB value is used.

There is a reference for the 140 named colors at the site https://www.w3schools.com/colors/colors_names.asp.