Set the COLORFGBG environment variable in new sessions to indicate to terminal programs whether the terminal has a light or dark background. This allows programs such as Vim to automatically pick appropriate colors when a Konsole session has a light or dark background.

The value of 'COLORFGBG' is not strictly accurate, instead it approximates the current color scheme as 'black on white' or 'white on black' - but this covers the most important need'