Nuke & ARRI ALEXA color management!

Color profile need to be add in init.py
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#custom input/output LUTs
nuke.root().knob('luts').addCurve("AlexaV3LogC", "{ (t > 0.1496582 ? pow(10.0, (t - 0.385537) / 0.2471896) : t / 0.9661776 - 0.04378604) * 0.18 - 0.00937677 }")

# ViewerProcess LUTs
nuke.ViewerProcess.register("AlexaV3Rec709",nuke.createNode,("Vectorfield", "vfield_file C:/luts/AlexaV3_K1S1_LogC2Video_Rec709_EE_nuke3d.cube colorspaceIn AlexaV3LogC"))

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Sample init.py

ARRI ALEXA Lut generator link!