This photo shows the silhouette of an urban forest in Cologne (ger.: Köln) at sundown in wintertime. The trees are loaded with snow. The image was derived from a HDR (high dynamic range) picture which was created from three distinct exposures. Usually, the different exposures for the creation of a HDR image are obtained by keeping the aperture constant and using different exposure times. In this case however the camera was (inadvertently, I may add) in shutter priority mode. So the exposure time is constant at 1/125 sec and the aperture varies.