Stacking for noise reduction

Discussion in '35mm Cameras' started by Dudley Hanks, Oct 22, 2008.

  1. Dudley Hanks

    Dudley Hanks Guest

    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, Oct 22, 2008
    #1
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  2. Dudley Hanks

    Paul Furman Guest

    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.

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

    all google groups messages filtered due to spam
     
    Paul Furman, Oct 22, 2008
    #2
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  3. Dudley Hanks

    Mark Thomas Guest

    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...
     
    Mark Thomas, Oct 22, 2008
    #3
  4. Dudley Hanks

    Dudley Hanks Guest

    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
     
    Dudley Hanks, Oct 22, 2008
    #4
  5. Dudley Hanks

    Dudley Hanks Guest

    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
     
    Dudley Hanks, Oct 22, 2008
    #5
  6. Dudley Hanks

    trouble Guest

    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.
     
    trouble, Oct 22, 2008
    #6
  7. Dudley Hanks

    Pete D Guest

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

    Cheers.

    Pete
     
    Pete D, Oct 23, 2008
    #7
  8. Dudley Hanks

    Dudley Hanks Guest

    Take Care,
    Dudley
     
    Dudley Hanks, Oct 23, 2008
    #8
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