Thanks, Julik, Andy and Simon for your suggestions, ideas and questions. After trying a number of things and reading some more about the way ProEXR and Photoshop handles 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 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
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]>I think the first problem is that the Photoshop blending is profoundly affected by the bit depth.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.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 blendingmodes 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 andpreadjusting the transparency grays...--
Julik Tarkhanov | HecticElectric | Keizersgracht 736 1017 EX
Amsterdam | The Netherlands | tel. +31 20 330 8250
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Stiller Studios
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