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
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