Discussion in 'Photography' started by J, Aug 16, 2013.

  1. J

    J Guest

    Suppose you had taken app., 200 shots, then realised you had set the
    exposure to 2/3 down on your previous shoot. ;) Which feature of Photoshop
    (or similar) would you use to 'restore' the esxposure to the photos? Gamma?
    Brightness? Contrast?

    J, Aug 16, 2013
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  2. J

    philo  Guest

    You should easily be able to readjust by tweaking "brightness" a bit...
    though you may also want to try your Gamma setting as well.
    philo , Aug 16, 2013
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  3. J

    PeterN Guest

    Which version of PS.

    Open the image in ACR and use the exposure correction slider.
    PeterN, Aug 16, 2013
  4. J

    Savageduck Guest

    Much depends on whether these were RAW or JPEG captures.

    I wouldn't touch gamma.

    If RAW then the correction is very simple to make in ACR.
    Once you have a basic solution you can create an ACR preset to apply to
    each RAW image file as required to give you a starting point for
    further adjustment.

    If JPEG then there are several ways of coming up with a fix. 2/3
    underexposed is not a major issue to overcome. The first thing I would
    do is to see jsut what fixing each of those images might need, some
    might not need any.

    I would suspect that you might have deeper shadows so a logical
    adjustment to look at should be Image->Adjustments->Shadows/Highlights
    (on a duplicated layer). To add more flexibility to this adjustment
    window check the 'Show more options" check box and the "preview" check

    Another method would be to add a "Levels" adjustment layer where you
    can adjust the tone via the layer adjustment sliders.
    You can do much the same with a "Curves" adjustment layer, with the
    caveat that you might want a little practice with using curves before
    committing yourself.

    Only go to the "Brightness/Contrast" adjustment layer once the major
    correction has been made.

    Just remember, if you are working on JPEGs always work on a copy so
    your originals aren't damaged by your work. Layers are your friend in
    this case.
    Savageduck, Aug 17, 2013
  5. J

    Tony Cooper Guest

    I agree, but I would do it differently. If working with a problem
    ..jpg, my first step is a Control/Command J to duplicate the Background
    layer. Any changes are done to this new duplicate layer.

    If you inadvertently SAVE, it will save as a .psd and that original
    layer is still there untouched.

    If I'm satisfied, I'll then flatten and save-as a new file name. This
    leaves the original .jpg untouched. If I'm *really* sure, I simply
    flatten and save, and it will over-write the original .jpg.

    Nothing wrong with making a copy first and working on that, but it's
    not the way I go about it.

    I also agree with using Shadows/Highlights, but always add 15% midtone
    contrast to the mix.
    Tony Cooper, Aug 17, 2013
  6. J

    PeterN Guest

    With only 22/3 underexposed, either make the adjustment in ACR, and be
    done with it, or do a levels adjustment on a copy of the background
    layer and if necessary, add an exposure adjustment layer. I would not
    worry if s small gamma adjustment was made, also.
    PeterN, Aug 17, 2013
  7. J

    Savageduck Guest

    That is true if you are talking about RAW files, We don't know if "J"
    shot in RAW or JPEG.
    That said, if RAW, then all options are open in ACR.

    If JPEG only the "Exposure" adjustment layer can be tricky, more so
    than "Levels" or "Curves".
    I wouldn't bother too much with a gamma adjustment.
    Savageduck, Aug 17, 2013
  8. J

    PeterN Guest

    There are many ways to do the same thing in PS.
    The exposure slider in ACR isa quick and dirty way to adjust exposure,
    even with jpeg files.

    The best way is to give the OP options, and let j try to see which way
    works best for him/her.
    PeterN, Aug 17, 2013
  9. J

    J Guest

    Just read all the replies from you guys. Thanks so much for your input, I
    have some brand new ideas now as to how to deal with the problem. I shot in
    jpg mode btw, so am slightly limited in my options, but I'm better place to
    sort things now for sure.

    J, Aug 17, 2013
  10. J

    Ken Hart Guest

    Depending on the film type you were using, it probably wouldn't matter. Most
    of the common color or b&w negative films will easily tolerant a 2/3 stop
    error. Many mechanical cameras that have seen a lot of use already have that
    much error.
    Ken Hart, Aug 18, 2013
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