this tool is now part of DoomCrap.
__________________________________
UPDATES!
Made a few useful changes so I figured I'd make an update...
New stuff:
- Alpha cutoff controls let you disable partial transparency
- Real-time preview of image as it will look after conversion takes place. Switch this off using the eyeball button.
- Program guesses whether to use a transparency mask and what color it should be when you view a new sprite. If you don't want this to happen, hit the lock button.
- added a button to view previous image in folder.
Spoiler: readme is still out of date...Download
feedback welcome, as always.