Andre Gunther lists the ten most common photographic mistakes and explains how to eliminate them with some good examples.

A “photographer” took a photo of a group and noticed that the flash hadn’t fired. He put the camera in his pocket with the comment “I’ll photoshop it later”.
There are so many things wrong with this (read my post if you want to know more), but even if he could solve all his problems with Adobe Photoshop (he would at least get increased noise levels), he would need to spend a lot of time on the photo.
Taking a second shot with the flash enabled would only take a few seconds. So if you think a photo didn’t come out right and if you have the chance, always take another one (but don’t delete the first – see 4, someone might have their eyes closed in the new one or there might be some other reason the previous shot turns out better).
Photoshop is an invaluable tool for photographers (I even wrote some Photoshop Tutorials myself); however, it is not a remedy for everything and you cannot turn bad photos into good ones with Photoshop alone.
I am a technical (computer) geek and we used to say, Garbage in – Garbage out. The same applies to Photoshop.

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