That's because some parts of your texture are basically metallic. If you used metallic materials on your project, espetially metals like gold, bronze or titanium (as examples), you WILL have colours on your roughness map. You should check a PBR material chart, and also those amazing PDFs from Marmoset and Allegorithmic :)…
Well last time i checked.. paint isnt supposed to be metallic, but even if that is the case. What do i plug into roughness channel and metallic channel then? Is it rgb that gets plugged into both? And I already understand the theory and practice of this workflow. PBR is not hte issue. The confusion of a texture labeled…