Some camera test web sites measure noise by counting the standard deviation
of a cropped grey area. They usually measure at high quality JPEG and
default setting provided by the camera itself. The result could be not
accurate, it will be affected by the sharpening applied inside the camera.
For example the standard setting of Olympus C5000 is very sharp (higher
sharpening applied) so the noise level is high, even at lowest (softest)
setting it is still sharp enough for direct output to print. For Fuji S1 Pro
and S2 Pro the default setting is very soft you may need more than one time
sharpening to make it look good.
Raw file may not be good enough to compare also, some RAW converters has
sharpening applied even at the lowest sharpness setting. And you cannot
compare RAW files as it has no meaning before covered to RGB picture.
C.H.Ling
> Would the basis noise level be evident in a 'raw' file...? Most of the
newer
> prosumer-grade digicams seem to be offering ability to save in 'raw'
format,
> would this be available for inspection without processing out the noise
> information, perhaps in Photoshop? Would a good test be to image a gray
> card, then examine the 'raw' file that results for any non-gray pixels in
> the gray area? Gross count or 'noise bits' percentage could be figured.
> --
>
> Jim Brokaw
> OM-'s of all sorts, and no OM-oney...
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