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[filmscanners] RE: Pixels and Prints

> From: Bob Frost
> Does a sensor 'average' the light falling on it, or does it use some other
> mathematical function?

Yes. However, there are spaces between the sensor elements, and it's
desireable to capture the light that would fall there. In addition, you
don't want the capture area of each sensor to have sharp edges--that leads
to aliasing on fine patterns. Therefore, a good digicam sensor will have a
diffuser over it, so that the capture area of the elements will be
essentially overlapping fuzzy blobs instead of sharply defined circles or

The function that defines the intensity versus distance-off-center is
essentially a finite impulse response filter that is applied to the image.


Ciao,               Paul D. DeRocco
Paul                mailto:pderocco@ix.netcom.com

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