On 2010-12-13 11:53 , Larry Colen wrote:
In general, we want to boost the dynamic range of our cameras. However,
sometimes we're shooting a very flat scene, or a lens with low contrast. If we
wanted to, for example, expand six stops of dynamic range into 12, or 14, bits
of data it seems that one way of doing this *might* be to increase the ISO, but
that would also increase the noise.
Are there be any electronic ways of doing this that wouldn't change the
sensitivity, or increase the noise? I don't expect that there are ways for an
end user to do this, but could a camera manufacturer allow you to dial in the
dynamic range of your camera for a particular scene?
well any tampering of the analog signal would probably increase noise
(or add distortion of some sort), but there may be some sort of preset
(or maybe variable) gamma in the analog/digital converter that
potentially could be tweaked to do the same thing (ISO is essentially
variable gamma, but it shifts the dynamic range window rather than
changing its width)
in most practical situations there's probably enough dynamic range in
the RAW that you might as well do it in post (just expose to the right
and bring down the shadows)
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