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Vray EXR issue
show user profile  FX
I'm switching to LWF, I've got everything set up ok except for one thing, Vray is defaulting the .exr output at 32 bit and I want it 16 bit.

If I save the file as .exr using the common tab in render setup I get an option to select 16 or 32, but if I do the same thing in the Vray frame buffer rollout when using "V-Ray raw image file" I don't get this option.
I select .exr using Save as type but have no setup option.

The reason being, when I switch modes in PS from 32 to 16 it affects the brightness/gamma of some layers, particularly the reflection layer when it's set to linear dodge.

I need to set it to 16 bit as PS won't allow me to invert the shadow layer when using 32 bit.

I assumed Vray outputted exr as 16 bit by default.

tia






read 469 times
12/15/2014 5:14:16 PM (last edit: 12/15/2014 5:14:16 PM)
show user profile  FX
As I'm only a few hours into the LWF / EXR method, I'm not sure if I should be flapping about this...

I'm following this tutorial for the elements setup and recording all the steps into an action.

http://cgi.tutsplus.com/articles/compositing-vray-render-layers-in-photoshop--cg-4077


Here's the steps I take to get to where I am..





Should I be overly concerned about the effect on the reflection layer when switching from 32 bit to 16 bit ?
read 461 times
12/15/2014 6:29:51 PM (last edit: 12/15/2014 6:29:51 PM)
show user profile  reeves1984
Why is it on linear dodge?

Reflections should be added

--
Simon Reeves


www.simonreeves.com - VFX Artist & Blog
twitter


www.analogstudio.co.uk <-- I work here

read 453 times
12/15/2014 6:37:13 PM (last edit: 12/15/2014 6:37:13 PM)
show user profile  FX
It is being added...Linear Dodge (Add)
read 453 times
12/15/2014 6:40:26 PM (last edit: 12/15/2014 6:40:26 PM)
show user profile  reeves1984
oh yeah hah, I didnt look at the video and forgot

(stupid photoshop naming)

--
Simon Reeves


www.simonreeves.com - VFX Artist & Blog
twitter


www.analogstudio.co.uk <-- I work here

read 443 times
12/15/2014 7:02:44 PM (last edit: 12/15/2014 7:02:44 PM)
show user profile  zeefusion
You could follow this. About half way down explains how to comp 32 bit in Photoshop and then work in 16 bit.
http://www.workshop.mintviz.com/tutorials/create-a-virtual-photography-studio-in-v-ray/


read 440 times
12/15/2014 7:05:46 PM (last edit: 12/15/2014 7:05:46 PM)
show user profile  FX
Thanks zee, from "Photoshop opens 16 bit half float as 32 bits per channel........" onwards.....all bases covered. ;)

Bloody fine tutorial!





read 431 times
12/15/2014 8:16:33 PM (last edit: 12/15/2014 8:16:33 PM)
show user profile  zeefusion
Yeah even though they are 16 bit float exr's from V-Ray, Photoshop and After Effects do not have a 16 bit float option, so they show them as 32 bit float to confuse people. 16 bit is only for integer formats. That's why you should always comp in 32 bit in PS or AE as comping in integer doesn't quite match the original beauty. You should also do all your post work in this format too as you have more colour range to play with but PS sucks and only has a few tools that work.
read 421 times
12/15/2014 9:26:16 PM (last edit: 12/15/2014 9:27:21 PM)
show user profile  FX
Yeah my first realization after a days diddling with exr is that maybe PS isn't the comping tool I thought it was.
The plus side is everyone's aware of it and workarounds and alternative workflows are a plenty :)

I'm comfortable with PS and don't fancy switching to a node based comp tool just yet.
read 415 times
12/15/2014 9:43:04 PM (last edit: 12/15/2014 9:43:04 PM)
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