[Digikam-users] Which transformation lead to recompress jpg files

[Wolfgang Mader]

Hallo list,

digging through the mail archive I have found a bit confusion about what 
transformation can be performed on jpgs in a loose less fashion. Therefore, I 
would really appreciate if s.o. could point this out to me or give me a place 
I can read about this topic.

Basic Questions (we talk about jpegs here)
What about rotation: Left click vs menu vs image editor, what is loose less, 
what not.
Meta data: What about altering meta data. Makes this recompression necessary?

Pleas cc me since I am off list.
Thank you a lot in advance.
Cheers, Wolfgang