While most maps in max allow you to change its “color map” with the graph, bump maps cannot use it.
You can test this for yourself:
- Add a image to a bump map
- Go in to the maps setting and scroll down to Output
- Enable Color Map
- Adjust the RGB or MONO
- Example take the white point from 1.0 to 0.2
- While the image will change the bump settings will not.