Minor tip: If you want to find the high point in a Bump map in Photoshop, load it as a layer, then put a layer completely filled with Black above it. Set the blackout layer to Darken, and opacity 70%. Then go to Layer Style/Blending Options and in the Blend If section, slide the white slider on the Underlying Layer bar to the left until a single point is highlighted. That point is the highest point of the map.