If you snap the shutter in a fast moving situation, you will find you get the next frame, not the one you thought you got. In short you have to learn to anticipate. However, the approximation is good enough so that a photographer can learn to work with it. As in all photographic processes part of the art is being able to accurately guess how the final image will turn out. A picture displayed on a computer monitor or on the Internet will look quite different than one printed out on the best quality photographic paper or reprinted in a magazine.
Photographers find themselves unconsciously adjusting their imagery to match the final output form.
Back to original paragraph. Also I realize that van Gogh is not strictly an expressionist, yet his work is considered to be one of the foundations of expressionism by virtually all critics. That thought started me thinking about the idea of photography as an expressive medium. Back to original paragraph. Go to Rick Doble's Digital Visuals site to see a full listing of his visual work on the Internet.