Re: Exciting New Digicams

["Gary Robertshaw" <groberts@fix.net>]

----- Original Message -----
From: Russell Williams <williams@Adobe.COM>
> There are two basic kinds of interpolation that are done with images from
> digital cameras.
> > 1. Interpolation that compensates for the fact that the digicam sensor
is
> *not* like a scanner sensor. A scanner sensor produces an output with a
> full R, G, *and* B value measurement at each pixel location. A traditional
> digicam's sensor produces an output with an R, G, *or* B pixel at each
> location. Interpolation is used to produce R, G, *and* B pixels at each
> location in the output file. Simple math would suggest that the digicam
has
> 1/3 the resolution of a scanner with an equivalent number of pixels, but
in
> fact for reasons that don't belong here, the actual number is more like
2/3
> for most images.

Thanks for a very educational post.

It stands to reason that there would be some differences between the physics
of scanners and digital cameras.  After all try to find a scanner that you
could hold up with a lens, and scan a scene in a tiny fraction of a second.
You'd have to have everyone sit perfectly still, probably looking grouchy,
as in the old photos, while the scanner did its slow work.  Perhaps each
pixel would have a unique perfect color, but the advantages would end there.

Gary

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