This photograph of Dunluce Castle, Northern Ireland was taken on a telephoto lens on a slightly hazy day. The picture lacks contrast and the colours are muted.

After Basic Photoshop Correction
This version has been adjusted for contrast by using the Curves command then the colours have been enhanced by using Hue & Saturation command. These sort of adjustments are quite normal.
This image demonstrates how a boring grey sky can be replaced seamlessly with something more dramatic. It's would great to wait for just the right lighting on the but sometimes this just isn't practical.
