After getting the art files “extracted”, I expermented some with changing them using GIMP. For Darkstone, the art files (particularly for the ground and buildings) were a single picture composed of many smaller pictures.
The game engine would know that if it wanted image X it would have to look at a specific piece of art file Z. This meant when I wanted to change one art asset, I could edit 16 different ones at a time. To test it out, I would just draw a letter or number in a huge obvious way on top of the exisiting art for each distinct section. Then when I loaded the game and look for where that letter or number appeared in the game.
The problem I ran into with Darkstone was the changes didn’t take at first. I had to troubleshoot why. It turned out to be a issue with how the file was saved. Darkstone required textures to be saved without any file compression. I simply had to resave the file “uncompressed” and it worked. With Darkstone, at that time I didn’t have any clear direction for what I wanted to do. It was more of a trial run to see how it all worked. Experiment done, my attention drifted away from Darkstone. It was more an issue of time since I didn’t have much so I would work on this a little here and there when I felt like it. Though later I would come back to Darkstone with a more focused purpose.