In the digital age of photography, post processing has become such an integral part of taking pictures, that the lines between photography and drawing or computing has blurred. Here is a sample picture I took in Smokey Mountain last year during Christmas. It was a cloudy day with a lot of fast moving dark clouds. To capture the motion of the clouds, I used long exposure (25sec). But since I did not use graduated neutral density (GND) filters, the sky/cloud turned out over exposed and the landscape under exposed.