KColorChooser is a simple application to select colors from the screen
or from a palette.

FEATURES
- Select colors from any location on the screen.
- Select colors from a range of standard palettes available.
- Color values shown in Hue-Saturation-Value (HSV), Red-Green-Blue
  (RGB) and HTML formats.

WWW: http://www.kde.org/applications/graphics/kcolorchooser