From: Daniel Piechnick
Hi Terry. Brightening up the image is very easy. Click Image > Adjustments > Brightness/Contrast, and change those settings. You can also bring up the Hue/Saturation properties by pressing Ctrl+U. Increaing the Saturation here will make your colours more vibrant. Getting rid of a shadow over a complex background is going to be very very difficult - even if you were experienced with Photoshop it would still be difficult. You could try to cut the person out of the bacgkround, by using the Freeform Pen Tool (have a look at my Separation tutorial) and then try to "negate" the shadow by giving the person a white shadow of the same size and intensity (maybe in Overlay or Lighten mode). You might also be able to do this by making a new layer, and using a diffuse brush to create this kind of negative shadow. As another option, you could always go back and take another picture of the background, and then transfer the person (without their shadow) across.