Whew.... If anybody gives a rip, I just made my first map 28k by 26k of a southeast corner of North Camp Grayling. It's being used for a TOCEX this summer.
It is not quite finished... I have to describe the terrain and movement costs. But, getting the map to show in the map editor, square, and to size was an acheivement for me. I got the map consolidated the hardway, I think.
I used terrabase to make the screen saves to a bmp format. That put it almost the correct size, and half way clear. That gave me 9 bmp files of x by x grid squares.
With lack of a better idea, I opened each bmp file in powerpoint, copied the pic, and pasted it in the adobe photoshop.
I then proceeded to follow the steps mentioned in the article in the reply above.
Good or not, I'm happy. Whew again. The file size is 8meg (at the end of the process, it was a lot bigger before indexing).