I wanted to fine tune my Paraview B&W preset scheme to increase the resolution in certain areas of my data range but the 'Color transfer values' dialog box is pretty crap for this purpose. Or perhaps there is a way in Paraview and I'm just being dumb? Anyway this is a very simple (rather scruffy) python code that edits a json preset scheme that someone out there may find useful!
To use:
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Clone the Git
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Open the ColorMapEditor.py and edit the VarA,VarB etc section to include your new refinements. Include the new path to the template BlankBW.json file and your new output Preset name.
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Run the python 2.7 script.
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In paraview Go to: Color Map Editor> Choose Preset > Import > YourNewPreset
Enjoy!!