Cross posting for completeness

The document detailing ACES support in various applications, is here (read only):

https://docs.google.com/document/d/1_GFplxDBvG-8vxHkhe6RV-ZGmkPKnhkUGC8_rzltcyI/edit?usp=sharing

If anyone is interested in updating the document for more current versions, let me know. I'd be happy to provide an editable link. Just message me.

For those interested in implementations, I think the Nuke nodes are supposed to be a reference. The OCIO Colorspace node creates the path from one colorspace to the next with this call

https://github.com/imageworks/OpenColorIO/blob/master/src/nuke/OCIOColorSpace/OCIOColorSpace.cpp#L207

m_processor = config->getProcessor(context, inputName, outputName);

which leads to this call to create a color space conversion

https://github.com/imageworks/OpenColorIO/blob/454f5fef6e991e645401341cd6fab41c2451b8cd/src/core/Config.cpp#L1357

processor->getImpl()->addColorSpaceConversion(*this, context, src, dst);

which eventually leads to this function

https://github.com/imageworks/OpenColorIO/blob/454f5fef6e991e645401341cd6fab41c2451b8cd/src/core/ColorSpaceTransform.cpp#L180

BuildColorSpaceOps

which takes two colorspaces and concatenates the source colorspace's to_reference (or inverse from_reference) transforms with the destination colorspace's from_reference (or inverse to_reference) transforms.

So... the code has it. The reference colorspace isn't the first colorspace. It isn't the space pointed to by the 'reference' role. It's the space that the config colorspace's various to_reference and from_reference transforms use as a target or as a source. Hopefully all the colorspace's in the config agree on that definition!

On Mon, Apr 16, 2018 at 12:38 AM, Abraham Schneider <abraham....@...> wrote:

Hi there!

I just posted this question on the ACES website: http://acescentral.com/t/why-utility-raw-as-reference-for-aces1-0-3-and-not-aces2065-1/1378

It seems like it's not just me that is unsure, how OCIO decides, which colorspace in a config is used as the reference space, that all other colorspaces are related to. And what excact purpose the 'reference' role has.

Could you maybe have a look at this and shine some light on this topic? 

Thanks, Abraham

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