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I wonder how to do that in Blender. I desire to extract images of bump maps from normal maps, so that I can re-work them in Krita or any other painting software.

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There are no built in method that converts a Normal map to a Bump in Blender. It would be possible to write a python script to do this but it would take much research to be able to produce desirable results.

I only know of one tool that can do this and that is Substance Designer.

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    $\begingroup$ Thanks for answering. I have just bought ShaderMap ($49) yesterday, as I want nothing to do with Adobe, which has bought Substance Painter and Substance Designer. ShaderMap is for editing maps; its tools include brushes probably for all map types. I'm currently exploring ShaderMap and taking tutorials on it. I think ShaderMap & BPainter addon might make a good combination as an alternative to Substance Painter. shadermap.com/home $\endgroup$
    – Rita Geraghty
    Commented Feb 12, 2019 at 18:59

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