How to turn off noise reduction ?

[V_kids]

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Is it possible to turn off the noise reduction at M9 ?

I'm using RAW format, never turn on the noise reduction.

However, everytime I'm shooting more than 1 or 2 sec, the camera always do the "noise reduction"

I can see it on the LCD, right after the camera finished taking the picture.

 

Please advice me how turn off this one.

 

Thank You

Andree

[wattsy]

You can't turn it off (which I suspect you knew anyway).

[cbretteville]

The camera 'exposes' a black frame the same exposure time as your shot and uses that to reduce static sensor noise. As watsy mentioned, it can't be disabled. The digital Ms don't use a noise smoothing algo so it actually works well.

 

Carl

[V_kids]

Ahhh...!! so that's it.

Thank you for the information

Really appreciate it

 

Andree

[hoppyman]

I think I recall that Sandy told us here that there is now some in-built noise reduction at some higher ISOs (on the M9) even for DNG files. .

That is slightly different to the system mentioned here for long exposures (which could actually be at a low ISO).

[250swb]

Lets not confuse Noise Reduction with Noise Filtering, two very different things.

 

 

Steve

[andyb]

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Lets not confuse Noise Reduction with Noise Filtering, two very different things.

 

 

Steve

 

Maybe you're right, but then there is something strange in the Wikipedia article about noise reduction Noise reduction - Wikipedia, the free encyclopedia

Even a black frame added to an image has to be considered a filter, don't you agree?

At the end it's only a question of definitions and I think we all agree that there are big differences between filtering algorithms to achieve noise reduction.

 

Please let me know if I got something wrong.

 

Andreas

[mjh]

Also the hot pixels eliminated (in JPEG and DNG files) by subtracting a dark frame and interpolating the affected pixels are not your ordinary kind of noise and have quite different characteristics. Calling this noise suppression is a bit misleading but camera vendors do it anyway. “Hot pixel elimination” would be a better term. And note that this has to be performed in-camera as the dark frame only exists in-camera. The only alternative would amount to storing two images (the image and its dark frame) and to shift the burden of dark frame subtraction to the raw converter, with no obvious benefits.

[250swb]

Andreas, irrespective of what Wikipedia says, 'noise reduction' is used by camera manufacturers to mean 'hot pixel elimination' as mjh has pointed out.

 

Steve

[Guest nafpie]

The only alternative would amount to storing two images (the image and its dark frame) and to shift the burden of dark frame subtraction to the raw converter, with no obvious benefits.

 

One obvious benefit would be, that you may be able to use ONE darkframe for a number of images (same exposure time & outside temperature for all of course) -> no more waiting for the darkframe after EACH single exposure.

 

Stefan

[scott kirkpatrick]

I think I recall that Sandy told us here that there is now some in-built noise reduction at some higher ISOs (on the M9) even for DNG files. .

That is slightly different to the system mentioned here for long exposures (which could actually be at a low ISO).

 

Several people have noticed (Sean Reid, Sandy, myself, ...) that in the M9 there is weak noise filtering being applied at ALL higher ISOs (the M8 only seemed to do it at 1250 and higher). If you want to make very large prints, it would be nice to turn this off and use tools that are optimal for the intended output, not a general solution. This is a frequently requested item in threads about future firmware features..

 

scott

[Double Negative]

...This is a frequently requested item in threads about future firmware features..

 

And we all know how well that works out.

[jaapv]

Several people have noticed (Sean Reid, Sandy, myself, ...) that in the M9 there is weak noise filtering being applied at ALL higher ISOs (the M8 only seemed to do it at 1250 and higher). If you want to make very large prints, it would be nice to turn this off and use tools that are optimal for the intended output, not a general solution. This is a frequently requested item in threads about future firmware features..

 

scott

Although I would agree with the request, the word " frequently" is better replaced by " rarely"