Color at a location on the screen

[Matt Denton]

Hello

Does anyone know how to find the color at a location on the screen?

I've got a small clear circle that drags constrained horizontally over 
a color bar to select a color. The mouseColor works perfectly as long 
as the cursor is over the color, but as the clear circle is constrained 
to the color bar, the cursor can really be anywhere.  So I need to find 
the color at a location, ie where the circle is on the color bar.  I've 
searched under 'screen', 'loc', 'cursor', 'color' and every other 
combination I can think of.

I seem to recall an external or was I thinking of another script 
language?

Thanks again, if anyone knows...

M@