sorry but no, command line is not implemented :-(
Viewing post in Spritesheet Maker Viewer comments
Thanks for answering :)
Honestly I'm slightly happy to hear that, because I just wrote my own CLI sprite sheet generator and I would have been a little annoyed if found out after the fact that there already was a tool that did exactly what I wanted. But my use case seems to be the exception and your tool can do a lot more than mine.