I think maybe the MatchGrade node is dependent on a knobChanged callback
running when the output file knob is changed before it will let the
`writelut` knob be executed.
If I replace the .setValue call on the file knob with .fromUserText, it
seems to work:
filename = nuke.thisNode()['filename'].value() + '.csp'
mg = nuke.toNode('MatchGrade1')
mg['outfile'].fromUserText(filename)
mg['writelut'].execute()
-Nathan
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