I want to use the alpha channel to add height data to my textures. I am currently getting textures online and then using paint.net to convert them to DDS. Problem with paint.net is that I can't set the alpha to zero while maintaining the RGB data. It also makes editing a pain if I want to make changes. I can calculate the height on the fly based on the average of the rgb, but I would prefer to use an actual map so that I can adjust the values myself.