Adding to that: I found the easisest way of having control was to have two separate grades, letting the pixelAnalyzer control a Mix between the two.. And since the flicker usually was a periodic one...(HMI un-sync etc) hence the term "perodic grade" :)
A set electrician once taught me to use BIG tungsten lamps with long filaments in the lightbulbs when shooting slomo, since they were more sluggish in reacting to the 50hz AC current. Also putting the lights on different phases could aid in taking out flicker. Of course.. synced light sources is a boon... but I've never come across footage using them :/ Hope you manage solving ypur footage. Cheers, Fred 2011/7/15 fredd hidef <[email protected]> > @Pat Wong... Sorry..Its friday and red wine takes its toll :) > Periodic grading - meaning what Adrian wrote... never done it in nuke.. but > too many times in shake :D > > > Have a nice weekend! > /fred > > > On Fri, Jul 15, 2011 at 7:35 PM, Adrian Baltowski < > [email protected]> wrote: > >> To eliminate flicker you can use old Shake technique with curve tool. In >> Nuke there is curveTool node but manual to Nuke is useless in this case. But >> you can refer to Shake manual because PixelAnalyzer in Shake and curveTool >> in Nuke are similar. >> In few words: with curve tool you can automatically analyze changes of >> brightness on selected region of your footage. Then you can invert the >> result curve and apply them to multiply in Grade node to counterbalance. >> The concept is similar to inverse track to stabilize footage but instead >> of track X/Y position changes, you "track" changes of brightness. >> You will find detailed description in Shake's manual. >> >> Best >> >> >> >> W dniu 2011-07-15 11:44:40 użytkownik Pat Wong <[email protected]> >> napisał: >> > yes there is camera movement. the time blur node. ive not encountered >> > that before what numbers do i put into that, thats basically averaging >> > the frames correct? >> > >> > so if it pulses every 50 frames i enter 50 in the divisions box? >> > >> > i presume i will get double imaging as ive got a camera move and >> > moving characters? >> > >> > >> > >> > >> > On 15 July 2011 10:29, Bill Gilman <[email protected]> wrote: >> > > If you can figure out the timing of the pulsing (ie. 10 frames or 50 >> frames) then you can figure out the numbers to put into a TimeBlur on that >> frequency. In general, you're going to want to stabilize your image as much >> as possible so that it's only comparing like parts of the frame, but in this >> case with the super high frame rate I'm guessing there's no camera move to >> speak of. >> > > >> > > Hope that helps >> > > >> > > Bill >> > > >> > > On Jul 15, 2011, at 1:53 AM, Pat Wong wrote: >> > > >> > >> Hi >> > >> >> > >> Ive been given some super slow-mo phantom camera green screen >> footage. >> > >> >> > >> Its super super slowmotion which is very very grainy.... and the >> > >> footage is also flickering/pulsing regularly throughout.... >> > >> >> > >> >> > >> >> > >> Has anybody had any experience with this kind of footage and its >> issues. >> > >> >> > >> Ive tried neat video and furnace denoise/degrain and deflicker....to >> > >> remove these issues. >> > >> >> > >> >> > >> But have not have much luck, the grain becomes quite clumpy whcih is >> > >> obvious as i need to keep fine details in the reflections of my shot >> > >> ... >> > >> >> > >> >> > >> >> > >> any tips on alternate methods to denose and deflicker other than >> those >> > >> mentioned would be a great help... >> > >> >> > >> thanks >> > >> >> > >> >> > >> >> > >> patrick >> > >> _______________________________________________ >> > >> Nuke-users mailing list >> > >> [email protected], http://forums.thefoundry.co.uk/ >> > >> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users >> > > >> > > _______________________________________________ >> > > Nuke-users mailing list >> > > [email protected], http://forums.thefoundry.co.uk/ >> > > http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users >> > > >> > _______________________________________________ >> > Nuke-users mailing list >> > [email protected], http://forums.thefoundry.co.uk/ >> > http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users >> > >> >> >> >> _______________________________________________ >> Nuke-users mailing list >> [email protected], http://forums.thefoundry.co.uk/ >> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users >> > > > > -- > ______________________________ > Fredrik Pihl > digital compositor > +46-708-559 559 > -- ______________________________ Fredrik Pihl digital compositor +46-708-559 559
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