On Tue, 2009-06-23 at 14:51 -0700, norseman wrote:

>          In Gimp, to add (SUM) the RGB values for a pixel and then 
> change all pixels who's RGB SUM is greater than a user stated value to 
> Second side of that is to change all RGB SUMs less than value given to 
> Black. BUT not doing both at same time, thus allowing user to "step" in 
> and see what got lost.

Use the Levels tool. That is pretty much exactly what you achieve by
moving the Input levels in the Value channel (except that Value is not
defined as the sum but the max of the RGB values).


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