Silhouettes aren't just for sunsets. When I shot this great egret at Batiquitos Lagoon yesterday, I was shooting directly into a mostly overcast sky. I knew the detail of the egret would look washed out against the bright sky. I planned, then, to convert it into a silhouette. While I could have done this in the camera, it is easier to do in Photoshop and allows for more options.
Original image:
More bird photographs can be seen here.