Vandy,
The concerns people are posting are very real. When attempting to render the .jpg an error message states that the .jppg file must be 1024x1024 pixels and the size of the included .jpeg is 513x769.
I, of course, realize that regions in SimCity 4 are not square, but rather rectangles. I have successfully rendered regions in the past using the same step by step instructions illustrated in the provided link. I also take note of the posting detailing the successful rendering and don't really know how to follow his example. I do not know what I'm doing wrong, have you or anyone else succeed in rendering this map in game?