The reason .4545 isnt the same is because sRGB doesnt have a gamma of 2.2. Its a power curve and it more like 2.4ish if you are trying to reverse it with a simple gamma. So you either accept the difference, use gamma 2.2 instead of sRGB or use 32bit tiff or exr. You shouldnt be applying or converting the profile in PS either. I dont know what CMM ENGINE nuke uses but it probably not the same as adobe and no 2 CMM ENGINES will produce the same result. You can tell PS to use the system cmm or any installed cmm. On Apr 29, 2014 6:46 AM, "Florian Einfalt" < [email protected]> wrote:
> Hello, > > I am having this problem with PNGs from Nuke that I need to deliver in a > Photoshop psd-file. This specifically concerns the shadow pass of my comp > but generally there is a discrepancy on everything that is not solidly > opaque. > > My workflow is as follows: > - I write my 8-bit PNG out of Nuke using the sRGB colorspace. > - When I open the rendered PNG in Photoshop I assign the sRGB color > profile and over a 'transparent' background the shadow looks to have > similar density to the one in Nuke. > - When I comp that layer over a white background though, the shadow is > suddenly more dense than in Nuke. Also, there is a much harsher fall-off in > the shadow. > > Is this because Photoshop treats alpha information differently from Nuke? > > I thought I can maybe counteract this by additional grading in Nuke but > even when I grade the alpha gamma to 0.4545 in Nuke and then write the PNG > I get closer but not exactly to the same result. > > Does anyone have a suggestion? > > Thanks. > > Florian > > -- > > > Florian Einfalt Senior Digital Artist > T +44 (0)20 7833 3032 M +44 (0)7808669580 > [email protected] > [image: Saddington & Baynes] <http://www.saddingtonbaynes.com/> > Saddington Baynes Ltd | Studio 3, 21 Wren Street. London WC1X 0HF. United > Kingdom | Map <http://signature.saddingtonbaynes.com/map.php> > Disclaimer <http://signature.saddingtonbaynes.com/disclaimer.php> | > Printing? Consider the environment. > [image: Twitter] <http://www.twitter.com/saddbaynes> [image: > Facebook]<http://www.facebook.com/SaddingtonBaynes> > [image: linkedin] <http://www.linkedin.com/company/saddington-baynes> [image: > pinterest] <http://pinterest.com/saddbaynes/> [image: > vimeo]<http://vimeo.com/saddingtonbaynes> > [image: behance] <http://www.behance.net/saddington_baynes> [image: > instagram] <http://instagram.com/saddingtonbaynes> > > _______________________________________________ > Nuke-users mailing list > [email protected], http://forums.thefoundry.co.uk/ > http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users >
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