Although this worked for me for a while, I reverted to standard PDF files. The workflow is much easier and other people can work with PDF files directly as opposed to a folder full of JPEG files.
A lot of my scanned images are plain JPEG files. When I have a multiple page document, it will become multiple images.
One could join them into a single PDF file, but I would rather have the original files since images in PDF usually look blurrier since they are scaled somehow. With text, it makes it harder to read.
Browsing through multiple images is not a problem with programs like Gwenview or Eye of Gnome. The only thing is that they display them fitting to the window. If you zoom, they will center. This might be natural for pictures, but not for a document.
Opening a single picture in Okular yields what I need: Fit to page width, starting at the top of the image. Unfortunately, Okular does not support multiple image files, and that is not going to change either.
This is a little script that generates a HTML page which combines all those images. A web browser starts at the top of the screen and is able to fit images to width of the window.
It assumes that your images are numbered like this:
physik111-03-korrigiert+1.jpg physik111-03-korrigiert+2.jpg physik111-03-korrigiert+3.jpg physik111-03-korrigiert+4.jpg physik111-03-korrigiert+5.jpg physik111-03-korrigiert+6.jpg
They have to have the exact same name, just differ by the number behind the + sign.
Call it with any of the images, it will figure out the whole sequence.
And this is what it looks like: