Stacking for noise reduction

Hi Folks,

Not being an expert in Photoshop, I'm trying to figure out the basics.

I've heard that, if one takes a number of identical pics and "stacks" them
in Photoshop, one can obtain an end image with less noise.

I'm wondering what steps are involved in this process so I can ask my son to
give it a try.

Appreciate all the help I can get.

Thanks,
Dudley

Dudley Hanks wrote:
Hi Folks,

Not being an expert in Photoshop, I'm trying to figure out the basics.

I've heard that, if one takes a number of identical pics and "stacks" them
in Photoshop, one can obtain an end image with less noise.

I'm wondering what steps are involved in this process so I can ask my son to
give it a try.

Appreciate all the help I can get.

Google helps.
Examples: Search string: "" image stacking noise reduction ""

http://www.flickr.com/groups/canonpo...7600370418804/
http://www.rocketroberts.com/astro/ccdnoise.htm
http://tinymachineshop.blogspot.com/...-take-two.html
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--
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Alan Browne wrote:
Dudley Hanks wrote:
Hi Folks,

Not being an expert in Photoshop, I'm trying to figure out the basics.

I've heard that, if one takes a number of identical pics and "stacks"
them in Photoshop, one can obtain an end image with less noise.

I'm wondering what steps are involved in this process so I can ask my
son to give it a try.

Appreciate all the help I can get.

Google helps.
Examples: Search string: "" image stacking noise reduction ""

http://www.flickr.com/groups/canonpo...7600370418804/

In this example, they show a high ISO shot but why use high ISO if
you're on a tripod? I don't think this technique is very useful in
normal photography... maybe if your camera only does 30 second exposures
& you've got something very dark. Astrophotography isn't normal photography.

http://www.rocketroberts.com/astro/ccdnoise.htm
http://tinymachineshop.blogspot.com/...-take-two.html


--
Paul Furman
www.edgehill.net
www.baynatives.com

all google groups messages filtered due to spam

Dudley Hanks wrote:
Hi Folks,

Not being an expert in Photoshop, I'm trying to figure out the basics.

I've heard that, if one takes a number of identical pics and "stacks" them
in Photoshop, one can obtain an end image with less noise.

I'm wondering what steps are involved in this process so I can ask my son to
give it a try.

Appreciate all the help I can get.

Thanks,
Dudley

In what context, Dudley? You might find dark-frame-subtraction (which
is a built-in feature of some cameras, or can be done manually) helps
also, depending on what he is shooting.

Registax is often mentioned by astronomers, but I haven't used it, only
dark-frame occasionally...

"Paul Furman" wrote in message
...
Alan Browne wrote:
Dudley Hanks wrote:
Hi Folks,

Not being an expert in Photoshop, I'm trying to figure out the basics.

I've heard that, if one takes a number of identical pics and "stacks"
them in Photoshop, one can obtain an end image with less noise.

I'm wondering what steps are involved in this process so I can ask my
son to give it a try.

Appreciate all the help I can get.

Google helps.
Examples: Search string: "" image stacking noise reduction ""

http://www.flickr.com/groups/canonpo...7600370418804/

In this example, they show a high ISO shot but why use high ISO if you're
on a tripod? I don't think this technique is very useful in normal
photography... maybe if your camera only does 30 second exposures & you've
got something very dark. Astrophotography isn't normal photography.

http://www.rocketroberts.com/astro/ccdnoise.htm
http://tinymachineshop.blogspot.com/...-take-two.html


--
Paul Furman
www.edgehill.net

The technique is a bit different, Paul, but my A720 is a bit noisier than
I'd like, even at 100 ISO. I thought I'd try the technique to see if it can
improve the quality of some of my pics. Since I do a lot of low-light work
without any movement, I'm hoping that stacking will give me quality closer
to that of a DSLR.

Take Care,
Dudley

"Alan Browne" wrote in message
...
Dudley Hanks wrote:
Hi Folks,

Not being an expert in Photoshop, I'm trying to figure out the basics.

I've heard that, if one takes a number of identical pics and "stacks"
them in Photoshop, one can obtain an end image with less noise.

I'm wondering what steps are involved in this process so I can ask my son
to give it a try.

Appreciate all the help I can get.

Google helps.
Examples: Search string: "" image stacking noise reduction ""

http://www.flickr.com/groups/canonpo...7600370418804/
http://www.rocketroberts.com/astro/ccdnoise.htm
http://tinymachineshop.blogspot.com/...-take-two.html
.
.
.
Thanks for the links, Alan. They are just what I was looking for. Your
Google query was much more presice than the one I tried and yielded much
better links.

Take Care,
Dudley

If you are tripod based you may get the kind of results you are looking for
with HDR processing in a program like Photomatix--the Photoshop version
leaves much to be desired.
It is best to use identical images obtained with different exposures, at
least 3 but it can be more depending on your desires/experience.
You can use Photomatix to process as HDR images differently processed
versions of the same image, particularly useful if you are beginning with a
raw image, probably useless if you are using in-camera mutilated jpegs.

Paul Furman wrote:
Alan Browne wrote:
Dudley Hanks wrote:

I've heard that, if one takes a number of identical pics and "stacks"
them in Photoshop, one can obtain an end image with less noise.

I'm wondering what steps are involved in this process so I can ask my
son to give it a try.

Google helps.
Examples: Search string: "" image stacking noise reduction ""

http://www.flickr.com/groups/canonpo...7600370418804/


In this example, they show a high ISO shot but why use high ISO if
you're on a tripod? I don't think this technique is very useful in
snipped

My point to Dudley was that in Google he can find many examples of NR
techniques for a variety of purposes.

--
-- r.p.e.35mm user resource: http://www.aliasimages.com/rpe35mmur.htm
-- r.p.d.slr-systems: http://www.aliasimages.com/rpdslrsysur.htm
-- [SI] gallery & rulz: http://www.pbase.com/shootin
-- e-meil: Remove FreeLunch.
-- usenet posts from gmail.com and googlemail.com are filtered out.

"Dudley Hanks" wrote in message
news:FCtLk.3069$fF3.114@edtnps83...
Hi Folks,

Not being an expert in Photoshop, I'm trying to figure out the basics.

I've heard that, if one takes a number of identical pics and "stacks" them
in Photoshop, one can obtain an end image with less noise.

I'm wondering what steps are involved in this process so I can ask my son
to give it a try.

Appreciate all the help I can get.

Thanks,
Dudley



If you just want to do stacking and do it easily then try a little program
called "registax".

Cheers.

Pete

"Pete D" wrote in message
...

"Dudley Hanks" wrote in message
news:FCtLk.3069$fF3.114@edtnps83...
Hi Folks,

Not being an expert in Photoshop, I'm trying to figure out the basics.

I've heard that, if one takes a number of identical pics and "stacks"
them in Photoshop, one can obtain an end image with less noise.

I'm wondering what steps are involved in this process so I can ask my son
to give it a try.

Appreciate all the help I can get.

Thanks,
Dudley



If you just want to do stacking and do it easily then try a little program
called "registax".

Cheers.

Pete
Thanks for the heads up, Pete. I'll give it a try.

Take Care,
Dudley