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...
-- 
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cel. +31 61 145 06 36 | http://hecticelectric.nl  
 
 
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