If you are interested in trying another program you should give gpick a try.
Just quoting the features:

Quote: Magnification and mouse pointer control with keyboard.
Automatic color name assignment.
Export to following formats:
Inkscape/Gimp Palette (*.gpl)
Adobe Swatch Exchange (*.ase)
Alias/WaveFront Material (*.mtl)
Cascaded Style Sheet (*.css)
Import from following formats:
Inkscape/Gimp Palette (*.gpl)
Adobe Swatch Exchange (*.ase)
Oversampling with five falloff types:
Multiple pixel values are averaged to help picking colors from sources with noise, patterns and etc, where each pixel is different and overall color is produced by different amounts of particular color.
Palette from image.
Color scheme creation tools.
Mix two or more colors using variable number of steps and different mixing types.
Lightness and/or saturation variations.
Harmonious colors.