Ross Litscher wrote:

> I take it that the gray is supposed to disappear?

Yes. :)

Your visual system is sensitive to light ratios. The ratio of intensity
of adjoining pixels is negligable, so if not seeing the picture as a
whole you don't see the contrast.

--
David Fontaine  <dav### [at] faricynet>  ICQ 55354965
My raytracing gallery:  http://davidf.faricy.net/

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