Hello Skullbonz, I don't mind about the downgrading because my pictures are still beautiful and because I send them to the web, I need light format which is JPEG.
Everything is possible in programming, and in quite all kind of software, we can choose the default format to save. Even in some close programs like "Ms Office" ! So it might have a solution to choose a default format. If the developer can answer, I would be happy.
Or maybe it can become a feature for the next version ?
Thanks to all of you for your kindness