Source: http://www.theverge.com/2013/12/23/52101...

t all starts with capturing an image. You can tweak exposure, push the color temperature in different directions, and sharpen images after the fact, but you’ll have a much better time of it if you simply take a technically correct picture from very beginning. Nailing focus and exposure are the priorities, in that order. When in doubt, refocus and shoot a second photo. And a third.