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Why not leave NR on all the time?
I read so many reviews where the reviewer says that IQ improves with NR on. Why don't they leave it on full time, or does NR degroagate the overall IQ or sharpness?.

I really am confused as it sounds like turning on NR fixes all the noise problems...

Comments (6)

NR can include taking another dark frame exposure internally and subtracting hot pixels, etc. If you are in a hurry, this keeps you from taking another shot for at least as long as the preceding exposure. Some techniques may also impact detail so might be better approached later in the workflow...

Comment #1

I usually have it off....

I'd rather use third party software for NR. The in-camera algorithms can be less than ideal. You also have more control of the amount of NR applied in software as opposed to the "take it or leave it" choices in the cameras menus..

Bill.

John Spaar wrote:.

I read so many reviews where the reviewer says that IQ improves withNR on. Why don't they leave it on full time, or does NR degroagatethe overall IQ or sharpness?I really am confused as it sounds like turning on NR fixes all thenoise problems...

Comment #2

Craig Gillette wrote:.

NR can include taking another dark frame exposure internally andsubtracting hot pixels, etc. If you are in a hurry, this keeps youfrom taking another shot for at least as long as the precedingexposure..

This may vary depending on the camera. Certainly some Olympus models offer rapid sequence shooting, more than one frame per second. This capability is disabled when NR is on. This applies to the "dark frame subtraction" facility, which in the right circumstances is very useful and has no adverse effect on the image..

Some techniques may also impact detail so might be betterapproached later in the workflow..

Indeed there are NR techniques applied, particularly at high ISO, which irreversibly smooth and destroy detail. Applying NR in a controlled fashion during post processing of the original image, at the very least allows NR to be applied to certain selected areas and not to the entire image, or allows the use of more sophisticated algorithms which can benefit from the computer processing power available when time and power consumption are not the limiting factors.Regards,Peter..

Comment #3

Hi,.

And you only really need NR when there's noise to deal with. That doesn't happen at all ISO settings and, since it's sound policy to use as low an ISO setting as possible or needed, then NR isn't needed. Also most cameras go up to 400 ISO without needing NR and 400 ISO covers a lot of subjects and lighting. Some of us only use it now and then..

Regards, David..

Comment #4

David Hughes wrote:.

And you only really need NR when there's noise to deal with. Thatdoesn't happen at all ISO settings and, since it's sound policy touse as low an ISO setting as possible or needed, then NR isn'tneeded..

That may depend on the camera. Noise is not always due to high ISO..

I know from experience with the (admittedly old) Oly C5050 that NR is beneficial even at the lowest ISO setting. This applies to shots taken at perhaps 2 seconds or longer exposure time, where the dark frame subtraction NR solves the problem..

Of course this does not take anything away from the general idea, that NR is not needed all the time.Regards,Peter..

Comment #5

Then it best works for long time exposures. For time dependent random noise that dominates for "typical" shooting, dark frame subtraction actually increases the random noise. Thus, for normal exposure times, it is best to not use dark frame subtraction. If the NR involves reducing the time dependent noise, then the issue likely is shooting speed as NR can be time intensive.Leonhttp://homepage.mac.com/leonwittwer/landscapes.htm..

Comment #6

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This question was taken from a support group/message board and re-posted here so others can learn from it.

 

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