ColorID Mask to Render using Flux

[Hanz-89]

I have a ColorID map and I want to convert it to a rendered image using Flux. However, I need to specify the material or element in the mask area. I'm getting strange results. I uploaded the the Workflow for more clearity. I would appreciate any help or hints, as I've been trying to solve this for a while. Thanks.

ColorMap to Render .json

[ltdrdata]

I recommend starting with a very simple area specification.

[Hanz-89]

@ltdrdata thanks for the hint, i mean a simple area specification can be done by Flux Fill, but the issue how to deal with multupil area at the same time, to say red should be brick wall , white is glass window and so on as in the Workflow