Creating a silhouette is an easy technique to learn and useful in a lot of different situations. For obvious reasons, it doesn’t work well if you are trying to create a portrait … but in nature and architecture, you can create a little bit of magic with very little effort.
Silhouettes may make photographs appear “black and white” even though they are in color. The effect is easily achieved with the light source behind your subject.
All you need to do to get a silhouette is take your light reading on the brightest part of the scene or object. The dark part will got even darker and you can slightly increase contrast in post processing if you want to make it a true silhouette with no detail.