>   I wonder if an automatic measurement and then a threshold couldn't be
> developed. For example, if a given pixel hasn't changed color for the
> last n rays which have affected that pixel, then that pixel is done.

I simply calculate the standard deviation of the pixel values. A decent metric
is to see how the change in variance goes down as image converges.

Maybe this should be done locally where there are area of same color.

Anyway, it can be done.

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