Mod, are you kidding me? I dont believe what I read, The mighty lurker?? You know the difference between RGB image and Gridded Image right? , the answer is simple, when you brings your data to photoshop, It will automatically read as One band monochromatic image, and after you are done messin it up, your save as execution will automatically converted it into RGB image, the pixel wont store the original elevation values instead it will save the color value applied to it when it is displayed in photoshop, and you know what will happen next in global mapper. so to be concluded, dont brings your DEM to photoshop, actually what do you want to get from bringing your DEM to photoshop? if you want to create marvelous good looking Hillshade, just make it first in proper software and then brings the hillshade result to photoshop and you could tweaks it as much as you want, still, you are not testing us right? arent you? wakakaka