Tek wrote:
>>You can't really answer this from looking how it works in real life -
>>when you take a photograph of a star the ideal camera outside the earth
>>atmosphere in ideal empty space will only show an infinitely small
>>point.
> 
> 
> Well I was thinking of a digital camera, which works by having a grid of colour
> sensors that effectively just add together the brightness due to all photons
> falling upon that pixel. Surely with that a very small point would always be 1
> pixel in size and have a brightness proportional to it's brightness multiplied
> by how much of the area of the pixel it covers.
> 
> I'm not sure how all that corresponds to gamma ramps and such, but digital
> cameras tend to get sharp images without aliasing, so surely that can be used as
> a model for an anti-aliasing technique?

That's something completely different and does not help to determine the 
best way to antialias a raytracing scene.  Note the only reasons why i 
brought up the photography comparison was to illustrate the interaction 
of averaging processes and nonlinearities (both occurs both in digital 
and conventional photography).

Christoph

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