hiya, don’t know about your scanning software, but with photography kit, we could set what dpi we wanted to scan at, and then save it as a tiff.
To make tiff’s i think you’re going to need photoshop or the like so i’m not sure you’d be able to use quicktime files. in your scanning software can you output still images. if so you could batch process in photoshop maybe
hope some of that helps a bit