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Neon Junkyard

Color correction math? & recreating nuke's grade node in houdini

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As the title says I would like to (somewhat) recreate the functionality of nuke;s grade node, in SOPS, as on OTL.  I find the color correct pretty unintuitive, and would like the controls nuke offers which I find very easy to use. Obvious controls for black and white point, gain exposure gamma etc.  Also the ability to tint any parameter is a big bonus.  

However I am having a hard time finding info on the math that goes into even basic color corrections, i.e. if you wanted to tint the gamma (midtones) how would you even go about doing that. Haven't found any good rescources on this topic

Thanks!

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