I have done a fair amount of reading around what a good specular map is and what a good displacement map is, but can't see good agreement among artists as to what this is.
Does any one have an opinion of what would be a good approach to generate these in code from the original diffuse/ albedo image. I'm thinking some sort of hi pass filter to generate the specular map, I'm unsure if this should be color or greyscale.
For the displacement map I'm thinking it can be a greyscale of the original stretched across the full tonal range from 0-255. Alternatively perhaps there is something that could be done to a normal map that might produce better results.