Nicholas A. Sinnott-Armstrong wrote:
--- You wrote:
James Richard Tyrer wrote:
The Fuji sensor has pixels of two different sensitivities arranged in a
pattern so that they are all Green to increase the dynamic range.
Wonder where the rest of that sentence went. IAC, the Fuji sensor is
arranged so that all of the lower sensitivity pixels are Green in the
Bayer CFA. Since there are twice as many Green pixels as Red *or* Blue
pixels this tends to equalize the color sensitivities. According to
their literature, this is done by making them smaller. This is going to
reduce the thermal noise (constant) but not the image noise (variable).
--- end of quote ---
All the gory details are here:
http://en.wikipedia.org/wiki/Super_CCD
There are low and high sensitivities of _every_ pixel.
Yes, they have come out with another new generation and that is true of
the sensor in the S5 (and probably some of their new high end cameras).
http://www.fujifilm.com/about/technology/super_ccd/img/index/fig_04.jpg
The interesting thing about this is that with the previous sensor (which
is like the diagram in WikiPedia the small sensors were all green from
what I have read) it would have been possible to use CMY rather than RGB
and have the small sensors be White. There seem to be advantages to
CMY, but with a Cartesian matrix, there are diagonal color artifacts
which can be avoided by offsetting alternate rows of pixels by 1/2 pixel.
--
JRT
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