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Removing rainbow stripes in video

Participant ,
Jul 07, 2024 Jul 07, 2024

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Dear all,

I recorded several videos from an exhibition for documentation purposes. When I started editing the clips, I found that all the videos had some rainbow effect stripes in the scenes. I am used to dealing with flickering caused by lighting, but I couldn't fix these rainbow stripes using the flicker correction method. I'm not entirely sure how to search for the proper technique to fix this issue because I don't know what it's called.

Does anyone know why this happens (so I can avoid it next time) and perhaps how I can fix it in post-production editing using Premiere Pro to eliminate the rainbow stripes?

Thank you.

Karen

 

Attached the screenshot of the video, the centre part have yellow-green ish stripes that is moving from top to bottom through out the video.

 

截圖 2024-07-07 19.21.40.png

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Community Expert ,
Jul 07, 2024 Jul 07, 2024

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quote

...I am used to dealing with flickering caused by lighting, but I couldn't fix these rainbow stripes using the flicker correction method. I'm not entirely sure how to search for the proper technique to fix this issue because I don't know what it's called.


By @Karen JR

 

I am not adressing "how-to" remove the flicker here, but since you mention that you are used to dealing with flicker caused by lightning i wonder if you for example shoot with let´s say 30 fps in PAL land, or shoot 25 fps in NTSC land? This is one of the most common reason behind flickering.

 

It all comes down to the electrical system, PAL=50 Hz and NTSC=60 Hz. So in short, if you are in PAL contry, shoot 25 or 50 fps since that divides nice and evenly with 50. If you are in NTSC country, shot in 30 or 60 fps since that divides nice and evenly with 60. If not, lights will flicker here and there due to the mismatch between the electrical system and the frame rate selected in the camera. Something to think about in the future to avoid flickering as much as possible.

 

Short example:

Electrical system in the U.S: 60 Hz (NTSC country)

Electrical system in the Europe: 50 Hz (PAL country)

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Participant ,
Jul 07, 2024 Jul 07, 2024

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Hi Averdahl,

 

Thanks for bringing up the fps. I am aware of the lighting and electrical system, so I am shooting in 50fps in UK. This usually solved most of the issues that I filmed, but this time it is a bit weird cause it has rainbow-ish stripes on that I've never seen before.

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Community Expert ,
Jul 07, 2024 Jul 07, 2024

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your screen grab isn't clear to me as to the problem... Maybe upload a short clip and it'll be clearer to me...  

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Participant ,
Jul 07, 2024 Jul 07, 2024

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Hi Michael,

 

Sorry, I couldn't find a place to upload a video so I took the screenshot instead. It seems like I can attach video clips here in the reply section.

Let me know if you know what is my issue here!

Thanks.

 

Karen

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Community Expert ,
Jul 07, 2024 Jul 07, 2024

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I'm not seeing any flickering...  what area are you  exactly  seeing this?   

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Participant ,
Jul 09, 2024 Jul 09, 2024

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It's the yellow-green stripes in the screen that's rolling - maybe it's not called flickering though I'm not exactly sure what is this.

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Advocate ,
Jul 08, 2024 Jul 08, 2024

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It seems your refer to wide, vertically rolling bands ... am I right?

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Advocate ,
Jul 09, 2024 Jul 09, 2024

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Check sort of repaired version below. But not in Premiere and it only works for near static camera:

https://drive.google.com/file/d/13se4kbj7mIq_G3J0ThELwjRxhn4aezIZ/view?usp=sharing

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Participant ,
Jul 09, 2024 Jul 09, 2024

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Yes, it is the vertical band that I was referring to.

How did you fix with the repair one? I have so many clips that are in the same situation but most of them have people moving in the scene. I want to try to fix them.

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Advocate ,
Jul 12, 2024 Jul 12, 2024

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The tool I used is here:

 https://drive.google.com/drive/u/0/folders/1nKyxRmq4eFfhBMTU6cxMVwOo3StQCtmO

- Install (steps #1-2 in readme,  then go Effects > ( how to use.txt) > Deflicker .

- Clear deflicker-defaults.txt and place this line there:

DeflickerMC (mode="tempsmooth", preroll=true, blksize=32, tr=2, hopfactor=60, thSAD=800, limit=10, dct=1)

 

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Participant ,
Jul 13, 2024 Jul 13, 2024

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It seems like it is a Windows system only software though... can't install on mac system.

 

May I ask if this is a processer for deflickering video? If so do you think if there is a way to do it through Premier Pro?

Thanks a lot.

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Advocate ,
Jul 13, 2024 Jul 13, 2024

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Yes, my tool is Windows only.

There are some paid Deflicker plugins for Premiere, but for your case (very slow rolling bands) I 've seen only one that *theoretically* may help ... and it's not one button tool - there still trial & error included: 

https://www.youtube.com/watch?v=rqy3IIlM2NQ

In this tutorial, you will learn the basic steps for using DEFlicker Rolling Bands in After Effects. You will see a few examples demonstrating different scenarios. 06:56 See these links to learn more about wagon wheel effect: https://www.youtube.com/watch?v=VNftf5qLpiA ...

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Advocate ,
Jul 13, 2024 Jul 13, 2024

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Alternatively, you can try to mask it out: https://youtu.be/89kuCMGxVr0?feature=shared&t=132

😍 Fix Flicker Bands with my FREE Preset: https://get.whoismatt.com/bandremoval Does your video have slow rolling flicker bands messing up your footage? Here's how to remove those bands FAST in Premiere Pro! ❗ Get WhoisMatt LUTs: https://whoismatt.com/luts Fix Flicker In ANY Video Tutorial: ...

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Participant ,
Jul 15, 2024 Jul 15, 2024

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These tutorials look great! I'll definitely give them a shot! I wasn't able to search for tutorials as I might have look into the wrong keywords.

Thank you for all these information I'm gonna tested it out!

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