Something like r==0.5 || r==0.32 || r==0.765?1:0 Syntax maybe wrong and it might be && not || (and not or) but basically saying if r= value or another value then make matte white else black
Howard On 24 Jul 2013, at 22:09, David Yu <dave...@gmail.com> wrote: > Thanks Frank! Will give it a shot. > > Is there a way so that I can isolate a pixel that has the same value in the R > G and B Channel values. Eg. I have some "bad" pixels with values such as > 0.5,0.5,0.5 0.765,0.765,0.765 0.32,0.32,0.32 etc.... > > Their neighbour pixels would always have different R G and B values. > Usually lower because the bad pixels are always brighter than their > neighbours. > > I'll try to post an image later. > > Dave > > > > > On Wed, Jul 24, 2013 at 12:42 PM, Frank Rueter <fr...@beingfrank.info> wrote: >> in that case just use something like >> r>13, g>13, b>13 >> >> to check every channel against a threshold or to check the average instead: >> (r+g+b)/3>13 >> >> etc. >> >> If you don't like the expression node you can also use Clamp, set the >> minimum and maximum to whatever threshold and turn on minClampTo and >> maxClampTo to map the clamped values to black and white. >> >> >> >> >> >> >> On 24/07/13 16:36, David Yu wrote: >>> Not NaNs. the hot pixel have RGB values do isnan does not work >>> >>> >>> On Wed, Jul 24, 2013 at 5:28 AM, Frank Rueter <fr...@beingfrank.info> wrote: >>>> and if it's NaNs or infs you need to isolate, you are after you can use >>>> "isnan()" and "isinf()" in the Epxresison node to get a mask >>>> >>>> >>>> On 24/07/13 09:04, Frank Rueter wrote: >>>>> I'd use this technique to generate the mask for the bad pixels, but >>>>> instead of blurring heavily, I would stencil out the original frame with >>>>> the mask, then blur it just enough for a subsequent >>>>> unpremult to fill the gap. >>>>> >>>>> >>>>> On 24/07/13 05:47, John Mangia wrote: >>>>>> Use an expression node with r > value ? 0 : 1 where value is the upper >>>>>> threshold. Use that matte and keymix in a heavily blurred or translated >>>>>> frame within the hot pixel matte. >>>>>> >>>>>> On Tue, Jul 23, 2013 at 1:43 PM, Ron Ganbar <ron...@gmail.com> wrote: >>>>>>> Define hot. >>>>>>> Do you mean NaNs and INFs? >>>>>>> >>>>>>> >>>>>>> >>>>>>> Ron Ganbar >>>>>>> email: ron...@gmail.com >>>>>>> tel: +44 (0)7968 007 309 [UK] >>>>>>> +972 (0)54 255 9765 [Israel] >>>>>>> url: http://ronganbar.wordpress.com/ >>>>>>> >>>>>>> >>>>>>> On Tue, Jul 23, 2013 at 8:41 PM, David Yu <dave...@gmail.com> wrote: >>>>>>>> Hi. Anyone know a script or expression to remove hot pixel noise from >>>>>>>> images or 3d renders? >>>>>>>> >>>>>>>> I tried some crude 3x3 matrix tricks to enhance the pixels and tried >>>>>>>> to "pull" the pixels out and subtract from the main image. Then i used >>>>>>>> the result as a mask for a median filter set at 1. >>>>>>>> >>>>>>>> Looking at the RGB channels, the hot pixel is the same value on all 3 >>>>>>>> channels while the neighbour pixels are different per channel. I'm >>>>>>>> hoping for a more elegant way to detect hot pixel using an expression. >>>>>>>> >>>>>>>> Dave >>>>>>>> >>>>>>>> _______________________________________________ >>>>>>>> Nuke-users mailing list >>>>>>>> Nuke-users@support.thefoundry.co.uk, http://forums.thefoundry.co.uk/ >>>>>>>> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users >>>>>>> >>>>>>> >>>>>>> _______________________________________________ >>>>>>> Nuke-users mailing list >>>>>>> Nuke-users@support.thefoundry.co.uk, http://forums.thefoundry.co.uk/ >>>>>>> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users >>>>>> >>>>>> >>>>>> >>>>>> -- >>>>>> John Mangia >>>>>> >>>>>> 908.616.1796 >>>>>> j...@johnmangia.com >>>>>> >>>>>> _______________________________________________ >>>>>> Nuke-users mailing list >>>>>> Nuke-users@support.thefoundry.co.uk, http://forums.thefoundry.co.uk/ >>>>>> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users >>>>> >>>>> >>>>> >>>>> _______________________________________________ >>>>> Nuke-users mailing list >>>>> Nuke-users@support.thefoundry.co.uk, http://forums.thefoundry.co.uk/ >>>>> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users >>>> >>>> >>>> _______________________________________________ >>>> Nuke-users mailing list >>>> Nuke-users@support.thefoundry.co.uk, http://forums.thefoundry.co.uk/ >>>> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users >>> >>> >>> >>> _______________________________________________ >>> Nuke-users mailing list >>> Nuke-users@support.thefoundry.co.uk, http://forums.thefoundry.co.uk/ >>> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users >> >> >> _______________________________________________ >> Nuke-users mailing list >> Nuke-users@support.thefoundry.co.uk, http://forums.thefoundry.co.uk/ >> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users > > _______________________________________________ > Nuke-users mailing list > Nuke-users@support.thefoundry.co.uk, http://forums.thefoundry.co.uk/ > http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users
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