Why does Auto-enhance reduce resolution?

I noticed when I apply auto-enhance to pictures taken on my iPhone 4S, the resolution in the EXIF data shows just over 3MP. I did a before and after and saw a huge drop in resolution. 3264x2448 without auto-enhance and 1536x2048 with auto-enhance used. No cropping was done. The only edit applied was auto-enhance. Why does the resolution get reduced fom 10mp to just over 3mp?

Any time you encode, or edit, a jpeg file, which is a type of picture file, it reduces the quality of the picture and to make up for the loss the resolution is lowered

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