@WWallace: I’m not seeing the same thing on my end in Arc 9.3. What happens when you import other Natural Earth tiffs? What happens if you open the tiff up in an image viewer outside of ArcMap, are the colors right then?
Natural Earth 1 and 2 look as-advertised in ArcMap. Hypsometric looks fine in Quantum GIS. Not sure what the problem is. I went ahead and saved as a .png and georectified it to fit, saved as a .bmp, and the resultant file looks fine in ArcMap. Not the best solution, but the problem’s solved at any rate. Thanks for the help.
P.S. It might be better served as a separate topic, but I’ll ask here first since I’m already writing: how would I go about setting up the tapered rivers in ArcMap (or is it exclusively something to be done in say, Illustrator)? I’m a bit confused by how they work. Thanks again.