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I use Photoshop 6.0 (since it's the only copy I own). Your mileage may vary with other paint programs. (Cricket paint anyone?)
Alright, why would you use a digital flash fill? Well, if there are some parts of your image that are very dark, like say, the face of your daughter, you could lighten it to a usable tone. Not only that, but this method is a semi-automatic, painfree way to lighten dark parts of an image.
Step 1: Duplicate Your Background Layer
You should now have a duplicate layer named "Background copy."