Image maps are loaded in at 8 bit resolution. This means that there are only 256 possible values for the displacement map leading to "ridges" in the bumps. By using 16 bit displacement maps - there are a possible 65K values - in other words, a more detailed displacement. For some displacement maps - 8 bits is fine. However, the displacement maps that give you wrinkles, pores, scars, etc need the 16 bits to give you the full range of displacements without looking chunky. --EK