If you need to patch stuff the best approach is to projection-stabilize a number of frames onto a texture or a card or what have you, render this out as a UV map or a static perspective camera, and to average some frames. You use the FrameBlend node for this, always set it to custom range. I start with 5 frames always and go up if the shot is underexposed since grain/noise will be more prominent. At some point all of the grain and most of the noise should disappear with no loss in sharpness. An additional benefit is that you will be able to actually see what your lens and stock are doing to your sharpness and the highlights in terms of softening, which is a great study by itself.
This operation gives you a plate you can paint on. Once done, output this plate through your matchmove/reproject pipe (this will introduce a little softening, nothing to do about that) with a matte. Then apply regrain through that alpha. Personally, I found Nuke's Grain node only suitable for film grain. If you want it cooler/snappier/more advanced/fit for digital noise as well use F_ReGrain, it's a great, proven tool. I tried to use SampledGrain or whatever it's called but never succeeded. If you have footage that cannot be reprojected or tracked for this workflow you will pretty much have to use NeatVideo or similar denoisers, which will soften the image one way or another. Another option for those fellows in the Baselight bay would be to give you 4K scans so that you have more sampling room, at least for those specific frames you are using for reprojection +- some head and tail. On 8 nov. 2012, at 09:33, adam jones <[email protected]> wrote: > So I guess I am asking if anyone has any techniques or tips (different > de_grain approach) with the tools at hand. -- Julik Tarkhanov | HecticElectric | Keizersgracht 736 1017 EX Amsterdam | The Netherlands | tel. +31 20 330 8250 cel. +31 61 145 06 36 | http://hecticelectric.nl
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