.....So now we have a toolset named "saundersLUT" ;)
On Tue, Jan 31, 2012 at 1:22 PM, Fredrik Pihl <[email protected]> wrote: > Thanks Lewis, I was moving in the same direction - but you served me a > lovely dish :) > > There is still miniscule differences in the darkest of the darks - but > these are not noticable if not gaining up by a zillion. > > Thanks a bunch!! > > > /fredd > > > On Tue, Jan 31, 2012 at 11:58 AM, Lewis Saunders <[email protected] > > wrote: > >> Fredrik Pihl wrote: >> > I run all and view in linear. >> > And I cannot replicate the grade exactly.... >> >> 3D LUTs don't tend to work very well on linear images, as you're >> discovering :) Because the values for the shadows are all squashed >> into about 0.0...0.1 it's hard to get enough points in that area, even >> with massive 64x64x64 cubes. >> >> I'd try converting to Cineon for the 3D LUTing part. The Vectorfield >> node has input and output colorspace options for exactly this reason. >> >> Under your CMSTestPattern try a Colorspace set to Cineon in, linear >> out. Then your grade nodes. Then another Colorspace set to linear >> in, Cineon out, then GenerateLUT. Once you've made the LUT you can >> use it on linear data with a Vectorfield node as long as you set its >> two Colorspace dropdowns to Cineon. >> >> This also allows you to use 3D LUTs for the full Cineon range, so >> you're not limited to linear values from 0..1. You can use something >> like -0.1 to 12.0. >> >> I admit that I still see slight differences between different >> applications using the same 3D LUT sometimes. I think this is due to >> different interpolation methods. I've never managed to get Houdini, >> Flame and Nuke to agree 100% on what the same LUT should look like, >> but with 32x32x32 cubes it's not enough of a difference to be a >> problem. >> >> -- >> Lewis Saunders >> trilinear fields for life >> London >> _______________________________________________ >> Nuke-users mailing list >> [email protected], http://forums.thefoundry.co.uk/ >> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users >> > > > > -- > __________________________________________________ > *Fredrik Pihl - **visual effects supervisor - digital compositor* > *UNITED IMAGE CREATORS AB* > rönnvägen 11, se-14144 huddinge, sweden > +46-708-559 559 > > -- __________________________________________________ *Fredrik Pihl - **visual effects supervisor - digital compositor* *UNITED IMAGE CREATORS AB* rönnvägen 11, se-14144 huddinge, sweden +46-708-559 559
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