[filmscanners] Re: Compression >> Wide range digitalcameras

["Julian Robinson" <jrobinso@pcug.org.au>]

This problem has occurred to me too as a disincentive to going fully
digital.   My normal photography is with negative film for the reasons you
state - to capture almost everything in a wide brightness range, and work
on it later to produce an acceptable contrast final image.  This can't work
with "normal" digital cameras because they have to produce the "acceptable"
contrast image first up, in doing so they have to throw away a lot of good
information.

So - is there a digital camera that allows you to record a
wide-brightness-range raw file?  If not, why not?

Julian R

At 04:17 12/10/02, Tony Sleep wrote:
>D1S is, as reported, distinctly poor at 6 stops.
>
>What's more, it is almost certainly an engineered inhibition. CCD sensors
>can now achieve 14 stops range, and do so completely linearly. I don't know
>any reason why CMOS should be worse, so it sounds like Canon have knobbled
>the range.
>
>I hope this will prove to be something that applies only to JPEGS, and the
>RAW files will contain far more range.
>
>There is a very good reason why Canon may have done so : wide range images
>look absolutely awful on-screen, impossibly flat, low contrast. You have to
>work with them, as raw material, and you wouldn't want to have to cope with
>the consequences of JPEG, it has to be clean, raw, high-bit data.

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