Feature request: export as image

[nu111]

I really love your app, it's a great replace for Microsoft Office Lens.
The thing I don't like much, is to be forced with PDFs, I would like to choose the result format, for example to jpeg or webp.

[Comrasaki]

I've already found your app pretty good, compared to other open-source document scanners. It would be more useful, though, if it supported a few other output image formats like JPEG and PNG. Thanks :)