I think it depends on the camera. There are some who say that Canon
does some noise reduction in hardware on all raw files. If true it's
certainly not the sort of detail mashing that you see on some JPEGs.
The only explict NR setting on a Canon 5D is the setting for "long
exposure" noise reduction where long exposure is defined as 1 second or
longer. This setting does have an impact on performance since it
determines noise level by taking another exposure with the shutter
closed and subtracting the noise found in the second exposure from the
first exposure. It prevents image review and menu operation. But it
doesn't necessarily inhibit firing the camera as long as there is buffer
space available.
I suspect that JPEG images probably are noise reduced above some ISO
level and perhaps depending on the "picture style" but the manual makes
no mention of it.
I did shoot some JPEGs today while I was cleaning the sensor. But the
camera is right back to raw now. :-)
Chuck Norcutt
Chris Barker wrote:
> Me too, Chuck. But since the camera records RAW images pretty
> quickly, I wonder whether it is worth having NR on at all. By this I
> mean that surely your processing of RAW will bypass any of the
> settings that apply to jpg files.
>
> Or is NR applicable to RAW file production as well?
>
> Chris
>
> On 18 Jul 2010, at 20:27, Chuck Norcutt wrote:
>
>> Although all my paper camera manuals are within easy reach of me as
>> I sit at my computer I never use them unless I'm not near a
>> computer. 160 page digital camera manuals with a minimal index are
>> not my idea of how to find things. I just load the PDF file(s) and
>> a quick keyword search (or two) generally finds what I'm looking
>> for.
>
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