[Gimp-user] Calculate area and diameter

[Dutch-User <forums gimpusers com>]

Hi everyone. In my collection of pictures, I found GIMP useful and easy to measure the diameter of a 
near-round coloured object. However, since the objects are not exactly round, I have to measure a few times 
and than guess for the average diameter. Now I've seen there's a way to select these objects by the colour 
they have. Does anybody know if there's an easy way to have GIMP tell me the overall area of the object, and 
the mean diameter?

Thanks!

-- 
Dutch-User (via gimpusers.com)