And the levels should be applied to the actual layers, not on masks. Unless I'm misunderstanding you.
2012/3/8 Simon Björk <[email protected]> > After, as it will make the layers blend in linear light instead of sRGB. > The overall gamma will be the same as the sRGB viewer lut you have in > Nuke. Although, you might introduce problems with banding as your really > bending the colors of 8-bit. Of course you will also clamp values above 1. > It might be better to do your compositing in sRGB space in Nuke as other > suggested, but it's worth a try. Essentially, this would be somewhat the > same thing as using a linear ICC profile in PS. > > > 2012/3/8 Richard Bobo <[email protected]> > >> Simon, >> >> Are you saying that the .4545 levels effect on the layer masks and the >> overall 2.2 gamma adjustment should be done before the 32 to 8 bit depth >> conversion or after...? >> >> Thanks, >> >> Rich >> >> Rich Bobo >> Senior VFX Compositor >> Email: [email protected] >> Mobile: 248.840.2665 >> Web: http://richbobo.com >> >> >> On Mar 08, 2012, at 03:46 AM, Simon Björk <[email protected]> >> wrote: >> >> Look here to create a linear ICC profile: >> http://fnordware.blogspot.com/2008/05/making-linear-icc-profile.html. With >> that set as your working space, you should be able to get correct blending. >> >> If you only have a couple of layers, you could try adding a Levels effect >> and set gamma to 0.4545 to each layer. On the top of your layers you would >> then need to set an adjustment layer with a gamma of 2.2. >> >> /Simon >> >> >> 2012/3/8 Randy Little <[email protected]> >> >>> because you are using blend modes in photoshop that do not support >>> float math(s) AND/Or you your working space ICC is not set up right. >>> >>> Randy S. Little >>> http://reel.rslittle.com >>> http://imdb.com/name/nm2325729/ >>> >>> >>> >>> >>> On Wed, Mar 7, 2012 at 20:43, Richard Bobo <[email protected]> wrote: >>> > Adrian, >>> > >>> > Thanks for wanting to help! >>> > >>> > Here are the parameters: >>> > -- CG render passes, comped and beautified in Nuke (auto work)... >>> > -- Ultimate deliverables for client are layered 8 bit TIFF files with >>> alpha >>> > out of Photoshop (different parts of vehicle)... >>> > >>> > In order to ease the workload, we are trying to render layered files >>> out of >>> > Nuke that get loaded into Photoshop. There is some automated work that >>> is >>> > done with a recorded macro/droplet in Photoshop and the end result is >>> our >>> > client-ready 8 bit layered TIFF .psd file. >>> > >>> > It would be *perfect* if we could render out an 8 bit layered file of >>> some >>> > kind from Nuke. The only reliable layered file format that I know of >>> coming >>> > out of Nuke is EXR. And, I don't think Nuke will produce a layered >>> TIFF or >>> > DPX that Photoshop can read properly. I could be wrong about that and >>> if I >>> > am, I'd love to know how to do it! Also, EXR output does not allow 8 >>> bit, as >>> > far as I can tell. So, we've tried 32 and 16 bit EXRs. >>> > >>> > The OpenEXR Photoshop plugin does a nice job of loading the EXR files, >>> > either as premultiplied layers with transparency or as unpremultiplied, >>> > separated layers for fill and alpha. The look of the layer comp in >>> Photoshop >>> > matches Nuke as long as we stay in 32 bit linear space in Photoshop. >>> > However, changing the bit depth to 8 bit results in a general >>> darkening of >>> > the image layers and a different "gamma look" to the transparent >>> areas. In >>> > other words, the nice linear gradients are squashed in some areas and >>> not as >>> > "spread out". >>> > >>> > The ProEXR manual does speak about this kind of problem and suggests >>> > bringing in the layers unpremultiplied and using Levels adjustments on >>> the >>> > layer masks only of each layer before changing the bit depth. With some >>> > trial and error, I have been able to find some values that will >>> *almost* >>> > work. However, the levels adjustment values are not the same for each >>> layer. >>> > And, it still does not look quite right. >>> > >>> > Photoshop *will* produce the correct result, however, *if* we choose to >>> > Merge the layers before doing the 32-->8 conversion - but that's not >>> what we >>> > need - we need the layers... >>> > >>> > So, for the moment, we are going to try and see if we can live with >>> > individual Levels adjustments for each layer in Photoshop, prior to >>> the bit >>> > depth conversion. That may be the path of least resistance - but it >>> sure >>> > ain't pretty! (8^P >>> > >>> > So, Adrian, I hope that explains things a bit better. if you have any >>> > suggestions, I would love to hear them! >>> > >>> > Thanks, >>> > >>> > Rich >>> > >>> > >>> > Rich Bobo >>> > Senior VFX Compositor >>> > >>> > Mobile: (248) 840-2665 >>> > Web: http://richbobo.com/ >>> > >>> > "Man has been endowed with reason, with the power to create, so that >>> he can >>> > add to what he's been given." >>> > - Anton Chekhov >>> > >>> > >>> > >>> > >>> > >>> > On Mar 7, 2012, at 6:24 PM, Adrian Baltowski wrote: >>> > >>> > Hi >>> > >>> > I want help or advise you something but I don't fully understand your >>> > workflow... >>> > You can of course make color conversion in nuke. Nuke is brilliant >>> software >>> > to make such a conversions BUT.... What next?? You cannot export >>> layered >>> > tiffs out of Nuke (at least not in usable form). Do you want to export >>> > layers as separate tif files? >>> > If you could explain your workflow then we could advise you more. >>> > >>> > >>> > >>> > Best >>> > Adrian >>> > >>> > >>> > W dniu 2012-03-07 16:33:54 użytkownik Juan Galva <[email protected] >>> > >>> > napisał: >>> > >>> > keep us posted, please! >>> > >>> > On 7 March 2012 16:27, Richard Bobo <[email protected]> wrote: >>> >> >>> >> Thanks, Julik, Andy, Diogo and Simon for your suggestions, ideas and >>> >> questions... >>> >> >>> >> After trying a number of things and reading some more about the way >>> ProEXR >>> >> and Photoshop handle things, we're going to try to make our tweaks in >>> Nuke >>> >> and let Photoshop do whatever it does. It may take a few rounds of >>> tweaking >>> >> and converting to see just what we need to do on the Nuke side to >>> make it >>> >> come out the way we want on the Photoshop end. However, it seems like >>> there >>> >> are just too many variables there. So, we'll not try to fight it... >>> (8^ >>> >> >>> >> Thanks for your help! >>> >> >>> >> Rich >>> >> >>> >> >>> >> Rich Bobo >>> >> Senior VFX Compositor >>> >> Email: [email protected] >>> >> Mobile: 248.840.2665 >>> >> Web: http://richbobo.com >>> >> >>> >> >>> >> On Mar 07, 2012, at 07:00 AM, Simon Björk <[email protected]> >>> wrote: >>> >> >>> >> In what application are you comparing the result of the TIFFs? Nuke or >>> >> Photoshop? I believe Photoshop use linear light math when in 32bpc >>> and in >>> >> that case, the blending of layers (and brightness) will look >>> different if >>> >> you change your project to 8 or 16-bit. >>> >> >>> >> >>> >> >>> >> 2012/3/7 Julik Tarkhanov <[email protected]> >>> >>> >>> >>> >>> >>> On 7 mrt 2012, at 01:51, Rich Bobo wrote: >>> >>> >>> >>> The problem is that we need to get 8 bit layered TIFs out of >>> Photoshop. >>> >>> >>> >>> I think the first problem is that the Photoshop blending is >>> profoundly >>> >>> affected by the bit depth. >>> >>> The second problem is that if Nuke does a 1D lookp table conversion >>> from >>> >>> one kind of RGB to another >>> >>> (including bit depth upgrades), Photoshop goes via Lab so what is >>> >>> happening is more like to a 3D LUT. >>> >>> >>> >>> What happens in your case is that probably Photoshop is converting >>> the >>> >>> layers first, and then the result of the blending >>> >>> modes changes the way the images look. Maybe it's an issue with layer >>> >>> mask and front unpremultiplication and conversion. >>> >>> >>> >>> For me the first thing to check would be the PS profile settings for >>> >>> 8-bit RGB. Also, where do the discrepancies occur the most? >>> >>> Blended layer edges? Maybe your workflow needs to be related to >>> manually >>> >>> unpremulting layers by the layer transparency and >>> >>> preadjusting the transparency grays... >>> >>> -- >>> >>> Julik Tarkhanov | HecticElectric | Keizersgracht 736 1017 EX >>> >>> Amsterdam | The Netherlands | tel. +31 20 330 8250 >>> >>> >>> >>> cel. +31 61 145 06 36 | http://hecticelectric.nl >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> _______________________________________________ >>> >>> Nuke-users mailing list >>> >>> [email protected], http://forums.thefoundry.co.uk/ >>> >>> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users >>> >> >>> >> >>> >> >>> >> >>> >> -- >>> >> -------------------------------- >>> >> Stiller Studios >>> >> Lidingö/Sweden >>> >> >>> >> Simon Björk >>> >> Stiller Studios >>> >> +46 (0)8 555 23 560 >>> >> Ekholmsnäsvägen 40, S-181 41 Lidingö >>> >> [email protected] >>> >> www.stillerstudios.se >>> >> >>> >> find us: >>> >> >>> http://www.eniro.se/query?search_word=stiller+studios&geo_area=liding%F6&what=all >>> >> >>> >> >>> >> _______________________________________________ >>> >> 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 >>> > >>> > >>> > >>> > >>> > -- >>> > >>> > Y ella dijo: "La ilusión mueve el mundo" >>> > >>> > >>> > _______________________________________________ >>> > 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 >>> >> >> >> >> -- >> -------------------------------- >> Stiller Studios >> Lidingö/Sweden >> >> Simon Björk >> Stiller Studios >> +46 (0)8 555 23 560 >> Ekholmsnäsvägen 40, S-181 41 Lidingö >> [email protected] >> www.stillerstudios.se >> >> find us: >> http://www.eniro.se/query?search_word=stiller+studios&geo_area=liding%F6&what=all >> >> >> _______________________________________________ >> 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 >> > > > > -- > -------------------------------- > Stiller Studios > Lidingö/Sweden > > Simon Björk > Stiller Studios > +46 (0)8 555 23 560 > Ekholmsnäsvägen 40, S-181 41 Lidingö > [email protected] > www.stillerstudios.se > > find us: > http://www.eniro.se/query?search_word=stiller+studios&geo_area=liding%F6&what=all > > > -- -------------------------------- Stiller Studios Lidingö/Sweden Simon Björk Stiller Studios +46 (0)8 555 23 560 Ekholmsnäsvägen 40, S-181 41 Lidingö [email protected] www.stillerstudios.se find us: http://www.eniro.se/query?search_word=stiller+studios&geo_area=liding%F6&what=all
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