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----- 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 - Please turn off HTML mail features. Keep quoted material short. Use accurate subject lines. http://www.leben.com/lists for instructions.
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