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Anyway to save this footage?

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David Weathersby
Anyway to save this footage?
on Dec 18, 2018 at 10:30:03 pm

I had a shoot at a club with very low light and strobe lights. My assistant was shot some footage I'd like to use but they were shooting into flashing lights and I believe they had the wrong shutter speed and that caused 1/3 bands across the footage. I've attached a sample of it. Is there anyway to reduce the effect?







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Steve Crow
Re: Anyway to save this footage?
on Dec 19, 2018 at 1:58:57 am
Last Edited By Steve Crow on Dec 19, 2018 at 2:01:56 am

I THINK it's the green laser shining directly into the camera lens - if I'm correct, shutter speed wouldn't matter. You can see the same bands on this video if you go frame by frame

https://photofocus.com/2013/09/14/beware-lasers-can-kill-your-cameras-senso...


I don't think there is anything you can do about unlike the banding you can get under florescent lights which I think is what you were thinking of in which case shutter speed would have a role to play very directly

Steve

Steve Crow


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David Weathersby
Re: Anyway to save this footage?
on Dec 19, 2018 at 2:19:23 am

Thanks! Yeah I think I was confusing fluorescent lights with strobe lights. Thanks again.


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Chris Wright
Re: Anyway to save this footage?
on Dec 21, 2018 at 5:21:21 pm

this is theoretical but its probably a combination of shutter strobe and color, so you'd need 2 passes.
digital anarchy deflicker for strobe/luma and a matte for the color. you might be able to use a difference of deflicker and original for color matte. it would be an adventure in color restoration though for sure, maybe even channel mix painting.


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David Weathersby
Re: Anyway to save this footage?
on Dec 21, 2018 at 6:24:48 pm

That is an interesting theory. I think I'm going to try it and see if a combination of this technique and running it through NewBlueFX will help. Thanks!


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Blaise Douros
Re: Anyway to save this footage?
on Dec 21, 2018 at 8:20:49 pm

I'd just lean into it, if I were you. There is NO automated solution to this--you would need to go frame by frame to matte the color, change the exposure of the matted areas, etc., and paint the foreground back in. So, I would suggest either use it as is, or stylize it even more by forcing frame blending or something. I see no problem with it as club footage--I doubt anyone but you would be bothered by club footage looking like this.


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Jeff Pulera
Re: Anyway to save this footage?
on Dec 26, 2018 at 9:11:41 pm

The problem is Rolling Shutter, which most newer camcorders use. Meaning, rather than the entire image being grabbed from the sensor all at once, the image is being scanned top to bottom (over a brief period of time, like 1/30 or 1/60 of a second). Therefore, a strobe light might start to get recorded mid-frame!

With my old CCD-sensor video cameras, a photo flash would simply create a single bright frame. My newer camcorders (starting about 10 years ago), with CMOS sensor started doing what you have, showing half the photo flash on one frame and the other half on the next frame.

https://petapixel.com/2017/06/30/rolling-shutter-effect-works/

I don't know of any post-fix unfortunately

Thanks

Jeff Pulera
Safe Harbor Computers


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