standalone color picker?

[David Garamond <lists@zara.6.isreserved.com>]

Is there a standalone color picker in the Debian archive? A tool that 
lets me point to a pixel on the screen and shows the RGB color value of 
that pixel. The only app I find on freshmeat.net is 'grabc' and it's not 
in Debian.

Regards,
dave