ID:1761638
 
(See the best response by Mightymo.)
Do they have to be BYOUND specific?
Best response
No. They are PNG files internally.
BYOND or bound? The .dmi format is just a .png with comments on it, you can import images into the .dmi format.(Falaxy even has a sprite sheet converter)
Oops lol did miss type BYOND is what I ment to say. Was unsure if they had to be made with DM software.