Reversing a filter in Photoshop (image already has a filter, i want to take it away)

Discussion in 'Mac Apps and Mac App Store' started by benlangdon, May 6, 2008.

  1. benlangdon macrumors 65832

    benlangdon

    Joined:
    Jan 13, 2008
    #1
    i have an image
    it clearly has a filter

    how can i reverse this?



    ps. i did not apply the filter, i got it off some site and thought it would be a good challenge
     
  2. CanadaRAM macrumors G5

    CanadaRAM

    Joined:
    Oct 11, 2004
    Location:
    On the Left Coast - Victoria BC Canada
    #2
    D***ed near impossible.

    In general, filters are lossy -- When a filter is applied and the image exported, the information has been lost and can't be recovered. Much like an MP3 encoded at a low bitrate can't be made better sounding by increasing its bitrate -- the detail is already gone.
     
  3. benlangdon thread starter macrumors 65832

    benlangdon

    Joined:
    Jan 13, 2008
    #3
    :(

    cant you like "digitally remaster" it

    like they do with old movies?

    :(
    bust

    what else should i try and do?

    i have colored things

    added things to pictures using brushes

    hmm...
     
  4. LethalWolfe macrumors G3

    LethalWolfe

    Joined:
    Jan 11, 2002
    Location:
    Los Angeles
    #4
    Remastering entails going back to the original source material and doing the mastering process all over again.

    Out of curiosity what kind of filter do you think it has on it?


    Lethal
     
  5. CanadaRAM macrumors G5

    CanadaRAM

    Joined:
    Oct 11, 2004
    Location:
    On the Left Coast - Victoria BC Canada
    #5
    It depends what the original filter did to it.

    Even if it is a simple change of contrast and brightness, when you "reverse" the controls on the adjustment, you end up with an image that is more posterized -- do a test for yourself with the Levels. If you manipulate the Levels and save it, then do Levels again and push it back to the original, you notice that there are fewer lines in the histogram that are widely spaced, because you threw away the data on the first filter, and then have to stretch the remaining data out when you do the second.

    There is a limited amount that you can do with interpolation, where the software 'guesses' the values to fill in the blanks. But this is putting in artificial data points, based on averages, and not the original data that was in the image pre-filtering. Try another example. Make a copy of an image, and reduce the resolution to about 1/5th the original. Then take the small copy, and increase the resolution again by 5 X to match the original - now look at the side by side. The blurriness you see is the effect of interpolation.
     
  6. mperkins37 macrumors 6502a

    mperkins37

    Joined:
    Jan 17, 2007
    Location:
    Phoenix, AZ
    #6
    If you have Photoshop CS3 it is supposed to be non destructive & you should be able to take it off completely. If not, then this is your first lesson in working on a COPY.....
    Open, Re-Name, Then work on in case you screw something up.
     
  7. benlangdon thread starter macrumors 65832

    benlangdon

    Joined:
    Jan 13, 2008
    #7
    ya the filter is horrible

    thats why i wanted to see if i could reverse it

    i get what you guys are saying


    i just wanted to take this pic off my friends page that has crap all around it and be muhhahaha i hacked your computer and got files.

    just for S*$&s and giggles





    ya now im working on this set of cards (a photos) and changing the color and adding color. i have tried 4 different ways to get this to look ligit but its...

    the one that came out the best was i de speckled the A (ace)
    then magnetic lasso set to 20 pixels 1 contrast and 100 frequency

    then i colored it
    then reveresed the selection and coped the out side color and touched up the edges.

    :(
    this photo shop s*#& is ...
    no wonder people take classes on this
     
  8. GoKyu macrumors 65816

    GoKyu

    Joined:
    Feb 15, 2007
    Location:
    New Orleans
    #8
    This is what layer copies and adjustment layers are for :)

    Give yourself as many ways "out" as possible, just in case you mess something up :)

    -Bryan
     
  9. benlangdon thread starter macrumors 65832

    benlangdon

    Joined:
    Jan 13, 2008
    #9
    thanks,
    i can use all the help i can get, im still learning.
    heck i just found out you can download brushes and patterns and such
     
  10. CanadaRAM macrumors G5

    CanadaRAM

    Joined:
    Oct 11, 2004
    Location:
    On the Left Coast - Victoria BC Canada
    #10
    Yah -- but the original question was how to reverse a layer on an existing web graphic -- so no layers available in the source material, it will be flat.

    No question though - when you are working on your own images make full use of duplicated layers etc. to give you the most flexibility / reversability.
     
  11. benlangdon thread starter macrumors 65832

    benlangdon

    Joined:
    Jan 13, 2008
    #11
    any good sites to learn?

    i made a layer once and i didn't really do anything with it
    but ya
    thanks for passing down the knowledge,
    much appreciated.
     

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