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weird distortions after rendering.

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chris willoughby
weird distortions after rendering.
on Mar 18, 2015 at 6:52:43 am
Last Edited By chris willoughby on Mar 18, 2015 at 6:55:30 am

Hi I'm rendering out a little film.
Some of the shots are about 200 MB.
I rendered out a sequence at the settings: HD 1920x1080-60p.

I got these weird distortions, like fringes or rings. I took some screen shots to show.

The distortions are faintly faintly in the source footage, but after rendering are quite severe.

If anyone could please give me some insight into what's causing them and how to remove them or reduce them, that would be great. Maybe if I render at
HD 1920x1080-50p instead it might make a difference.









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Aaron Star
Re: weird distortions after rendering.
on Mar 18, 2015 at 6:47:17 pm

That is banding, generally due to not having enough steps in 8-bit video to represent the gradient transitions.

Is the source footage 60P?

Try rendering in 32-bit FP (video levels) and seeing if that helps. Unless the banding is present in the source footage.

Could also try playing back in VLC just to compare.

Could try a different codec with a default profile that matches (=) the project.

Could try rendering to XDCAM-EX or 422, use VLC to check output, then use Handbreak to render to .mp4.


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Steve Rhoden
Re: weird distortions after rendering.
on Mar 19, 2015 at 12:04:57 am

Yep, that is color Banding. If your source footage has it, then
not much you can do to completely remove it, even if you render
it in 32bit.
There is however some plugins that has a Debanding filter that
can help a little bit, one such plugin i know of is Tiffen DFX 4 OFX
for Sony Vegas.

Steve Rhoden (Cow Leader)
Film Maker & VFX Artist.
Owner of Filmex Creative Media.
Samples of my Work and Company can be seen here:
http://www.facebook.com/FilmexCreativeMedia


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chris willoughby
Re: weird distortions after rendering.
on Mar 20, 2015 at 9:00:20 am

Hi Steve Rhoden and Aaron Star,

I tried to change the properties to 32bit, but it seems I don't have the option. Maybe because I don't have Sony Vegas Pro?

I gave a screen shot of how it looks to me.

Thanks for your time!



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Steve Rhoden
Re: weird distortions after rendering.
on Mar 23, 2015 at 7:29:36 am

Yeah, that's not the Pro version of Vegas, So there are limitations.
But as i said, even if you were able to change to 32bit, there may not
be any difference.

Steve Rhoden (Cow Leader)
Film Maker & VFX Artist.
Owner of Filmex Creative Media.
Samples of my Work and Company can be seen here:
http://www.facebook.com/FilmexCreativeMedia


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