Check the FAQ --- the manual guide explains it pretty well (and then my somewhere in there is my video of mipmapping which covers how to do so as well)
One slight issue with the video is that it doesn't mention that the formatting for the tcs file is slightly different if the image isn't indexed. Of course, considering the object of the video, that's not really a fault... Just saying that it messed me up when I attempted to hex something that wasn't indexed.
Then I remembered that I had the ]EE[ guide.