Add a document photography mode

[Korb]

Checklist

• [x] I made sure that there are no existing issues - open or closed - to which I could contribute my information.
• [x] I made sure that there are no existing discussions - open or closed - to which I could contribute my information.
• [x] I have read the FAQs inside the app (Menu -> About -> FAQs) and my problem isn't listed.
• [x] I have taken the time to fill in all the required details. I understand that the request will be dismissed otherwise.
• [x] This issue contains only one feature request.
• [x] I have read and understood the contribution guidelines.

Feature description

… with automatic cropping and automatic geometric distortions correction (perspective and barrel).

Why do you want this feature?

Obviously, for OCR, storage, forwarding, and PDF creation, "clean" photographs of documents without unnecessary elements at the edges of the frame and non-orthogonal text lines are best suited.

Additional information

No response

[PanderMusubi]

Something like this?

[Korb]

Something like this?

Not really:

[PanderMusubi]

Mine are the settings that are needed and yours is using the mode. So all three are relevant, with yours of course the main one.