How do you create a normal map similar to this?
In this polyester texture I just purchased, I noticed that the normal map (instead of roughness) is creating the silky look as well as the surface imperfections. This normal map looks flat and has patches of different colors Instead of bumps/elevations. How can I re-create this effect without using a texturing software?
I know how to make different PBR maps in Photoshop using only a diffuse map, but I'm not able to re-create a normal map similar to the image above. No matter what pattern (scratches, smudges, etc.) I use to try and make a normal map from, it ends up creating bumps/elevations instead of surface imperfections. How do you achieve this "silky" look along with surface imperfections using a normal map? How can I use a diffuse map of different patterns to create a normal map like this?