Adobe Lightroom and Apple Aperture are the two premiere digital photography post processing programs used by professional photographers.

Unfortunately, as good as they are, these programs are very expensive, and very complex, so not many amateur digital photographers use them.

However, there is an acceptable substitute, for amateurs, and it's free.

This video provides an introduction and explanation to "bluemarine":


Chris | Live Tech Support | Video Help | Add to iTunes

Here's the "Bluemarine" website, and the Bluemarine direct download link.

Please take note that the above links tend to be a bit finicky at times. It may be necessary to try them several times before they connect.