Are you also converting to sRGB when you convert to 8bit, or is it all staying linear? The layer blending will definitely change if you change colourspace, there's no way around that AFAIK. But if you are staying in linear or staying in sRGB, I'm not sure where your colour shifts are coming from?
Cheers, Andy ----- Original Message ----- From: "Julik Tarkhanov" <[email protected]> To: "Nuke user discussion" <[email protected]> Sent: Wednesday, 7 March, 2012 9:11:42 AM Subject: Re: [Nuke-users] 32 bit to 8 bit conversion? 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
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