AlbusD

I'm a new user, so please forgive my ignorance... I work in real estate and frequently deal with indoor photos with backgrounds that need lightening, similar to "flash fill." Is there a simple way to lighten a dark background? For example, in my old Corel Paint Shop Pro X8, there is a command called "Fill light" under Brightness and Control. Simple. Effective. Looking for a paint.net equivalent. Thanks very much for any assistance.