[filmscanners] Re: Newish Digital Tech

["David J. Littleboy" <davidjl@gol.com>]

"Paul D. DeRocco" <pderocco@ix.netcom.com>

>>>>>>>>>>>
No. In a Bayer pattern chip, each site makes use of one third of the
spectrum, and discards the other two thirds. In the Foveon chip, the other
two thirds of the light is absorbed and measured in the other two layers.
Another way of looking at it is that the Bayer pattern requires that each
pixel be divided into three separate smaller sensors, one for each color
(50% greeen, 25% red, 25% blue), and the smaller size of each sensor makes
it capture less light.
<<<<<<<<<<<<

There's a problem with your logic here. Although the Foveon chip measures
"all the red", each individual site measuring red measures _the same amount
of red_ as any individual site measuring red in a Bayer sensor. So the noise
level in each measurement is, in principle, identical. To make your argument
fly, you have to show that in reusing the smaller number of measurements,
Bayer increases the noise. I don't think it does...

David J. Littleboy
davidjl@gol.com
Tokyo, Japan


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