John VanSickle <evi### [at] hotmailcom> wrote:
> How long do you have to wait before the graininess has reliably become 
> unnoticeable?

  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.
When all the pixels fulfill this requirement, the image is done.

-- 
                                                          - Warp

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