To create the silhouette effect, you must meter/measure (CLICK HERE) the light/exposure for the background (the brightest part of the image) and completely under expose the foreground subject.
When first learning silhouette photography sunrise and sunset are good times to practice because the sun can be positioned directly behind the subject you wish to underexpose. (CLICK HERE for a good link).
Silhouettes at The Atlantic. CLICK HERE.
Tips for killer silhouette photography. CLICK HERE.
50 examples. CLICK HERE.
How to photograph silhouettes. CLICK HERE.
Another how-to. CLICK HERE.
