Hi Sharon "Newgimper"
of course you can with Gimp realize such "automatic"
corrections (look in image menu Layers - Colours - here you find many
usefull tools, the most interesting are: Curves and Levels,with them you
can change/adjust colours with more control than with "automatic" tools,
test how they work - you have preview, so you can manipulate as long as you find
something ok.)
Sharon, on the beginning you may work a bit with very good tutorials on this site:
www.gimpguru.org
they are good, because this nice guy not only shows how to do each step, but
he also explains "why", and "how it works", and gives tips for further reading.
Maybe you find there something interesting for you.
You may also read the Help files from Gimp - most of the tools are explained.
So try, experiment and have fun