In article <[email protected]>, 
[email protected] says...

[snip]

> I have no idea why, but here are some ideas I'd try out.
 
> So is it refreshing upon completion of the loop, or upon exit from 
> process()?

It turns out I need to call root.update_idletasks()
for my root Tk object to get it to refresh after
I put the pixel.

It works great now.

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