Review: CSP bugfix

Jeremy Selan <jeremy...@...>

Upon further testing, it appears the channel swizzling was backwards
during CSP lut importing.

I used Nuke as the baseline in terms of lut channel order, so it's
possible that I've actually broken things if Nuke's CSP Vector node is
broken. But if Nuke's works, OCIO's now agrees with the results.
Can anyone confirm Nuke's Vectorfield implementation of .csp files

I am including the file I used for testing. This gains down the red
channel by 0.5 - green and blue are unchanged.


I've confirmed that our 3dl handing is correct.

-- Jeremy

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