Our friend Scott Condray of Visualville has a great Photoshop tip on his website on how to take any image and color correct it in quick and easy to follow steps.
Step 1. With the image open select Image > Adjustments > Levels.
Step 2. Click on the Black Eyedropper to make it active.
Step 3. Move the Black Eyedropper over the center of Target 1 and Click.
Notice how the slight bluish cast in the shadows disappears and shadow tonality deepens.
To see the rest of the tutorial go here.