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 Post subject: Noise redution
PostPosted: Tue Oct 23, 2007 11:11 pm 
Hi Gordon,

Do you know if the noise reduction works when shhoting raw files and if so, is there any negitives to just keeping it on all the time?

Dave


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PostPosted: Tue Oct 23, 2007 11:21 pm 
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As far as I understand, NR is not applied to the 40D's RAW files in-camera and you choose to do this during the conversion later - say in DPP or ACR. BUT I may be wrong, so will check for you. In the meantime, Bob may know more...


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PostPosted: Wed Oct 24, 2007 9:30 am 
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As far as I am aware the sort of noise reduction routines you see in computer software are applied to some degree in JPEGs but not in RAW.

The manual makes no direct mention of noise reduction being applied to RAW files but I guess it is possible that "Long exposure noise reduction" may be applied and possibly even "High ISO speed noise reduction" though I would have thought the latter is unlikely. Not an issue really because (unlike with some Nikons) both of these noise reductions can be turned off from the menu if needed.

Bob.

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PostPosted: Fri Oct 26, 2007 4:39 am 
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Hi guys, I asked the most technical person I know at Canon and here's what they said:

"EOS 40D and other Canon EOS DSLR cameras do apply a level of noise reduction in the hardware processing of the signal from each pixel, this is typically done at an individual pixel level on the image sensor. Once the signal is transferred there are two different digitisation methods depending on whether highlight tone priority or not is active. (This is why HTP cannot be switched off in RAW processing)

Selecting High ISO noise reduction on the camera will have an effect on images shot in RAW as well as JPEG. The camera buffer is reduced due to this processing regardless of RAW of JPEG shooting."

Hope that helps!

Gordon


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