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[filmscanners] RE: Foveon




> Austin said:
> > The sensor array still have individual sensors for each of the
> colors, but
> > uses three of them per PIXEL.
>
> I guess you could call them 'individual', but the diagram 1/2 way
> down this page:
>
> http://www.dpreview.com/news/0202/02021102foveonx3tech.asp
>
> shows that the sensors really are stacked at different depths
> within each sensor.

Carefully look at the diagram titled "Mosaic Filter: Each Pixel - 1 Color"
(which really should say "Each Sensor" not pixel) and note that the blue
filter blocks red and green, that the green filter blocks red and blue and
that the red filter blocks green and blue.  OK, that works for me.

Now go down to "Mosaic Filter vs. Foveon X3" and they show a similar
diagram, showing how Mosaic filters block light...but magically, in their
sensor diagram below that, they show a blue filter, that passes both red and
green...right through, as well as a green filter that passes red.  I'm not
clear on how this works...and that is obviously their key to making this
work.

I'm all for this type of 3d technology, since I have been designing digital
imaging equipment for over 25 years, this 3d approach is how most anyone in
the field believe it should be done anyway, the concept is hardly new, and
has been around a lot longer than Foveon...but it's the implementation that
is important, not the concept.

As I said, I do like that they separate out the difference between sensor
and pixel, something that has been a peeve of mine for years ;-)

Austin

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