@itaychi - thanks for the very useful feedback. To answer your questions:

1. I thought about adding OK/Cancel buttons but due to space limitations decided to leave them off. I'll try squeezing them on if I can because it also annoys me that you can't look at settings without reprocessing.

2. You can load a different image by touching the currently loaded image. I don't think a prompt to save is necessary as the settings are not lost on loading a different image.

3. I intend to put a "random" option in for the light leaks. You can add your own leaks if you want by adding jpg files to /opt/classicprint/config/light_leak. The filename you use will appear in the menu. If you make any good ones then, if you let me have them I'll put them into the package for the next release.

4. Good idea. There's also plenty of room in the "film" settings

5. Same as 4.

6. As far as I can tell, this is a Qt bug. It's very annoying and I'll try to find a workaround but I can't promise anything.

Right, time to get working on those changes...