So, now that I have the basis of the coloring worked out for Terragen, I've been spending little bits and pieces of time re-working the mountains to include some exceptional peaks and fill in some of the "empty" areas that existed in the map as a whole, thus designating those areas that might be barren or desert-like. I have, however, hit a bit of a snag.
There is one area that I would like to make a plateau out of as a means of helping to define a gorge-like area. This could prove difficult base on the way I am building the height field. I have a couple of ideas regarding my approach to this particular task, but I think it is going to come down to using Wilbur, selecting the area in question, flattening it, then sending it back to the graphics editor for the building of other elevations on the plateau. Alternatively, I may be able to select based on elevation in Wilbur, save the selection and use it as a pseudo-mask to build on. Regardless of how I approach the process, it's gonna mean a few extra layers in the height field build which, in turn, may push my system resources a little too high. Guess I'll just have to wait and see what happens.
To that end, it may be a day or two before I manage to post a real update as I try to wrap my head around this problem and come up with a viable solution given the software I'm using. I'll try to post an update without the plateau depending on how things go with trying to build it. In the mean time, I'm open to other thoughts and/or suggestions on how I might approach this particular task.
P.S. It just hit me. The whole select by elevation in Wilbur is the way to go. All I'll have to do is flatten the selected area to the lowest elevation of the selection, save it as a separate .png file, then load it as a separate layer so that I can magic wand the area in my graphics editor and do a quick fill before continuing the build. It will still mean a few extra layers, but not as many as I was originally thinking.