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Tompppy
Participant
November 30, 2017
Answered

How to fix ghosting / double image

  • November 30, 2017
  • 4 replies
  • 10582 views

Hey,

I'm wondering if it's at all possible to fix ghosting without the raw source footage. Either with AE or Prem. Currently for this shot it's happening every 3rd and 4th frame.

    This topic has been closed for replies.
    Correct answer Rick Gerard

    After you deinterlace and check the cadence of the filed order temporarily double the frame rate of your comp and check the frames one at a time. You should never see motion going backward. If you do the field order and or the pulldown cadence is wrong. If you see a pair of ghosted frames then the footage was rendered one time as progressive and then rendered again as interlaced. That is where the pair of ghosted frames come from. This is not an uncommon problem.

    If the frame rate of the footage does not match the frame rate of the comp then you may see blended fields or ghosted frames once in a while even if the footage is properly interpreted. As I said before if there are cuts in the footage you will have to split up the footage into individual shots and process each of those individually. You may end up with a blended frame on the cut that you cannot get rid of so you either have to live with it or get rid of it.

    4 replies

    T
    TompppyAuthor
    Participant
    December 1, 2017

    Thank you Rick.

    T
    TompppyAuthor
    Participant
    December 1, 2017

    Both helpful! Thank you.

    I'm working in 23.976, footage is not from raw material, it is off an export (if that makes a difference?). Prores 422. I've played around with the pull down in interpret footage but still can't get rid of the split fields, the deinterlacing is fixed though. The field order looks to be WWSS and changing this in AE doesn't affect it correctly. Any other pointers?

    R
    Community Expert
    Rick GerardCommunity ExpertCorrect answer
    Community Expert
    December 1, 2017

    After you deinterlace and check the cadence of the filed order temporarily double the frame rate of your comp and check the frames one at a time. You should never see motion going backward. If you do the field order and or the pulldown cadence is wrong. If you see a pair of ghosted frames then the footage was rendered one time as progressive and then rendered again as interlaced. That is where the pair of ghosted frames come from. This is not an uncommon problem.

    If the frame rate of the footage does not match the frame rate of the comp then you may see blended fields or ghosted frames once in a while even if the footage is properly interpreted. As I said before if there are cuts in the footage you will have to split up the footage into individual shots and process each of those individually. You may end up with a blended frame on the cut that you cannot get rid of so you either have to live with it or get rid of it.

    R
    Community Expert
    Rick GerardCommunity Expert
    Community Expert
    December 1, 2017

    Looks exactly like film transferred to tape or an older video camera that adds 3:2 pulldown to achieve 24pfs. Check the footage properties by selecting the footage in the Project Panel and then check interpretation. You can have AE guess at the pulldown sequence. You'll know if you have it wrong by stepping through the footage.

    If you need more info on removing 3:2 pulldown get back to us or check the Search Help field at the top right corner of AE.

    BTW, if this is film transferred to tape and then edited as the video you are going to need to separate every shot to its own unique copy in AE and set the pull-down cadence for every shot. There is a high likelihood that the pull-down changes cadence with every cut.

    Also, if it looks fine at normal playback speed you may not need to worry about it. Every movie you ever watched on TV that was originally shot on film is interlaced with 3:2 pulldown and your eyes can't see the problem unless you pause playback.

    Warren Heaton
    Community Expert
    Warren HeatonCommunity Expert
    Community Expert
    November 30, 2017

    Are you working at 29.97 with 3:2 pulldown footage?

    If so, you need to remove the 3:2 pulldown so that your clip is running at 23.976 instead of 29.97 in the Interpret Footage dialog box.

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