[Sidefx-houdini-list] Linear Workflow

Craig Hoffman craigleehoffman at aol.com
Wed Aug 25 15:10:18 EDT 2010

 Is your monitor set to Linear space too?  If not, you should apply a gamma at the end of the chain to visualize the image properly.  

Linearizing generally is something you do to textures before the render so the lighting math all works out correctly and then you gamma at the end of the render or composite to look at it- unless you have your monitor set up in linear space (but then everything else will look like garbage usually and life is generally painful).




-----Original Message-----
From: Andy Nicholas <andy at andynicholas.com>
To: sidefx-houdini-list at sidefx.com
Sent: Wed, Aug 25, 2010 11:52 am
Subject: [Sidefx-houdini-list] Linear Workflow

Hi guys,

We've just started a job in Houdini and we're trying to use a linear

colour workflow. With the test I'm doing at the moment, I don't have any

textures, it's all pure lighting and shader models. I've got the Color

Correction gamma setting at 2.2 which I believe is the correct setting as

it visually matches what we do in XSI when we enable colour management.

The problem is that we're having a few issues with generating glossy

reflections because noise that wasn't visible before, now shows up a

treat, even with a large number of samples.

This is partly because the objects I'm reflecting are quite small, so in a

way, I'm not surprised I'm getting some noise. The issue is that before

using colour management, this wouldn't have been visible. On a black

background typically some of the noisy pixel values are only at around

0.0002, but they still show up as little grey splats on the image.

I've been doing a few tests, and while I get noisier results in mental ray

(using XSI with colour management enabled), it generally isn't as bad as

I'm seeing in Mantra.

So my simple question is, have any of you guys run into similar problems,

and if so, what strategies did you use to work around this issue? (or

alternatively, are we just doing something stupid?!)




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