Using multiple exposure to combat noise

Started Aug 2, 2007 | Discussions
Julia Borg Veteran Member • Posts: 7,280
Re: How did you stack them ?

Do you mean that they apply WB or anything else (I mean contrast etc)
to the raw data before averaging?

yes.

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Julia

Julia Borg Veteran Member • Posts: 7,280
Re: How did you stack them ?

aclo wrote:

Julia Borg wrote:

aclo wrote:

On the computer, it can be done using layers

not the same. stacking raw unprocessed data provides better results.

it's also more convenient in this case: set the camera to multiple
exposure, set the intervalometer, and it does it itself. The results
at ISO 100 are spectacular.

but it does not work for hand-hold shots. yhou still need to stack raw outside of the camera.

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Julia

PixelMinded Senior Member • Posts: 1,032
How it could be done on low-end models like D40(x)

jp wrote:

It can of course be applied to any digital camera but the advantage
of cameras with the multiple exposure feature like the nikon DSLRs is
that you can have it done immmediately in-camera on the spot, no need
for post processing, no card space wasted on multiple raws.

For those like me who don't own or can't afford the higher-end Nikons with this feature (D80 and higher), here is a thread which describes how to do it manually by post processing multiple images:
http://forums.dpreview.com/forums/read.asp?forum=1010&message=21711102
--
Ahmed Elnagar

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Vincent Jacobs Regular Member • Posts: 150
Re: Excellent!!!

Good idea

Alberto Tanikawa
Alberto Tanikawa Senior Member • Posts: 1,971
Photo Sampler program did just that

Back in the days, when I used to have an Olympus E-10, there was a program called Photo Sampler that did just that: stacking several images in order to subtract noise from the final image. It did have shortcomings, as do any process involving multiple images as opposed to a single one. Moving subjects were out of the question. But for still life and for some landscape photos, Photo Sampler was a great tool. Too bad it's no longer available. Here's a page that shows what can be done in Photoshop, and links to the previous maker of the software:

http://www.bophoto.com/e-10/noise.html

I don't know what happened, but they seem not to be in business anymore. One problem I saw was that they were offering version 2 I believe, while at the same time saying version 3 was on the way, and that it was going to be better. People were waiting for the next version, and did not buy version 2 anymore, and version 3 never materialized...

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Alberto T., PPA

funnelwebmaster
funnelwebmaster Senior Member • Posts: 2,566
Re: Excellent!!!

Wait a minute- autobracket will work; all that needs to be done is to trigger the shutter between exposure (using a remote) - each successive exposure will be bracketed according to your preference - up to seven separate exposures, I think.

Image_Thief wrote:

The only thing I have used the multiple exposure for is waterfalls in
bright sunlight. I prefer not to use a ND filter. I've done 10 shot
multiples with great success. Rock solid tripod is key. After reading
thru this thread I decided to see if there is a way to do a HDR with
multiple exposure. Auto bracket won't work but if you set the number
of shots to 3 or what ever you prefer, you can change the shutter
between shots. I tried 1.5 stops under/over and one right on. It
seems to work. I will have to experiment more with this for HDR and
noise reduction. I must say thanks to the OP for this insperation.

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aclo Regular Member • Posts: 480
Re: How did you stack them ?

Julia Borg wrote:

Do you mean that they apply WB or anything else (I mean contrast etc)
to the raw data before averaging?

yes.

Wow, you're right! Why, do you have any idea? (maybe they use integers to do the averaging?)

Julia Borg Veteran Member • Posts: 7,280
Re: How did you stack them ?

Why, do you have any idea? (maybe they use
integers to do the averaging?)

yes, unfortunately they do... multiply, shift, add and shift

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Julia

pidera Contributing Member • Posts: 925
Impressive !

Interesting thread !

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Krishnan V Regular Member • Posts: 149
D2X: In Camera Multiple exposure @ H-2, Samples

Here is what I did on the D2x. Should work on the D200 too.

http://krishphoto.com/equipment/d2x-in-camera-multiple-exposure.html

Best Regards
---Krish
http://krishphoto.com

Davidismyfriend Regular Member • Posts: 274
HDR multiple exposition with mutiple exposure

Hello, very interesting subject.
I just discovered in Photoshop CS3 the HDR composit.

It's just amazing, so basicaly what you do is shoot a braketing of a scene and then you do a mix of all the raw files with this new amazing tool.

The result is a 32bit picture where the exposure can be set at any point of the braketing and by changing the gamma, you can really make that wide.

So, it gives you the possibility to get rid of the noise and achieve some impossible exposures. I have posted one here...

This is shot with a nikon d200 it is the combination of 6 raw files with a braketing of 1/3 of a stop btw them, turned into a single 32 bit HDR file and then compressed into JPG.

Itsakpr New Member • Posts: 6
A program for doing it... wonderful results

Thank all of you. I've learned lots from you. Those of you who don't have the means or need to use CS3 or Dbigboy00 here's a sight that might help.

http://www.startrails.de/html/software.html

He comes at it from a different direction but the application is the same. I have used this FREE (read FREE!) program for star trails but, works for other stuff also.

Hope that helps.
There's nothing new in the world!
But, it's sure fun looking for

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