Here's a preset I created in Premiere Pro using only the effects that come with the program that will allow you to have the popular "Low Con Look" you see on a lot of today's music/fashion videos.
Original Shot
Low Con Look
Screen shot of effects used
And don't forget to use your scopes to help you adjust exposure
You can also play around with the levels effect to change to different color looks.
Feel free to drop a comment... hope this helps