Neatvideo and noisy clip

[Med D]

I captured a pretty noisy clip the other night. I grabbed my camera to shoot my son's school orchestra but had pretty sub-optimal location and lighting. I ended up with the noise goalpost pretty lit up. This is the first noisy image I have run into since buying Neatvideo in the GB so I thought I would try it out. It really did not seem to help at all though, so I'm not sure I am using it properly. I created a new noise profile but the preview of the impact it has was very minimal. I then tried rendering, and other than making the render time about 20x as long as normal there was no real impact.

I think the R3D can be accessed here. I'd love to hear how I might correct this clip with or without Neatvideo.

 

[ericyoung]

I assume you've watched Neatvideo's guides on how to use it?

http://www.neatvideo.com/howtos.html

Basically you need to select areas of your scene with even exposure, without scene detail or features, to analyse. The larger the area you can find, the better. Basically you need to tell the program that the area you have selected is uniform in exposure and that any detail in there is noise (i.e. not scene detail you want to keep!). Start off with an area of middling exposure. You can then tweak the profile by selecting additional areas.

In your frame, areas you can try are the large tall off-white panels in the background. The top sections of those panels would be great. You could also try the top of the green conductor podium. Then maybe tweak with samples of the darker areas.

 

[Matt Ryan]

Excuse the heavy jpeg compression:

Eric's advice is dead on. Also make sure to turn on Temporal filter radius to around 3 (it defaults at 1). That will analyze frames and remove anything that moves (ie. noise). This in conjunction with your spatial profile (with the target selection) should remove all or at least most all of the noise. The higher you set the Temporal number the longer the render times as it's analyzing individual frames. I even boosted your exposure a bit and still got clean results.

 

[Med D]

Thanks guys! Yes, I did read the NV guide. I found the guide to be somewhat lacking in detail...no pun intended. Particularly the info on the noise profile is a little terse.

I may have messed up the profile area though. NV's auto-profiler actually defaulted to the large white areas but I moved the selection to the black area on the conductor. I did not realize it needed a stationary part of the image and instead went for what looked noisiest. Now that I think of it though I can see where that would kill the process entirely if it expects a static area. I'll give it a shot with the white area profiled and the higher temporal filter. Long renders are OK as long as there is a positive result.

 

[ericyoung]

Watch the videos - don't just read the guide. Your shot isn't actually that difficult as it has nice large flat areas to profile, but on shots with only very tiny flat areas you will find the manual noise profile tweaking useful.