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Will Charles Doran
Participating Frequently
April 10, 2020
Answered

How to fix this weird steroscopic plate artifact?

  • April 10, 2020
  • 3 replies
  • 953 views

Hi everyone.

Client scanned this old stereoscopic plate and there is some sort of "interlacing"-esque artifact that is causing the overall image to look blurry. Edit: it turns out this is not a lenticular print but these are scanner artifacts.

Here's a crop:

The wavelength seems to be about 16 px, and it seems to shift the affected pixels by about 16 px horizontally as well. De-interlace only works with 1px rows, and the wave tool doesn't do the trick either as it creates its own artifacts.

 

How would you approach this fix?

This topic has been closed for replies.
Correct answer c.pfaffenbichler

Are the lines perfectly horizontal and regular? 

If so the Filter Displace could be useful, but otherwise …

3 replies

PECourtejoie
Community Expert
PECourtejoieCommunity Expert
Community Expert
April 11, 2020

Tell the client to stop scanning during an earthquake... 🙂 Excellent job!

    PECourtejoie
    Community Expert
    PECourtejoieCommunity Expert
    Community Expert
    April 10, 2020

    Hello, is it a lenticular image? 

    I think most filters would not work as the difference won't be the same everywhere to create the stereoscopic effect, the illusion of movement/depth...

    W
    Will Charles DoranAuthor
    Participating Frequently
    April 10, 2020

    Thank you PECourtejoie, I was thinking the same thing and I'm checking with the client to see if it's really lenticular, but if it is I'm really only worried about her face and to a lesser extent the body, which are all at the same general focal length & displacement.

      c.pfaffenbichler
      Community Expert
      c.pfaffenbichlerCommunity ExpertCorrect answer
      Community Expert
      April 10, 2020

      Are the lines perfectly horizontal and regular? 

      If so the Filter Displace could be useful, but otherwise …

        W
        Will Charles DoranAuthor
        Participating Frequently
        April 10, 2020

        I didn't even think of that, promising idea. I will try it.

        W
        Will Charles DoranAuthor
        Participating Frequently
        April 11, 2020

        Can you show how you exactly solved it with Displacement filter?


        Sure. I created a 16px wrap-around gradient as a separate .psd (the wavelength of the artifact is pretty much at 16px) and selected it with the Displace filter.

        Then I tweaked the scaling settings until the very top of the photo was solved for and looked lined up. Since the pattern isn't exactly every 16px, it gets out of sync as you go down (and then n*sync again, then out etc). I then just cheated the vertical scaling of the photo until it lined up all the way down. There was probably some math I could have done when I was in high school, but I just eyeballed it.

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