Color space transform bidirectionality

Alan Jones <sky...@...>

Hi All,

I'm just reading through the Nuke plugin to get an idea of the API and
how things
are supposed to work together.

I notice that it adds all color spaces to both the input and output.
This assumes
that all color transforms can be reversed. I was under the impression that some
transforms would not be. Is there any facility within OCIO's current design for