Photo Note 26-What do you mean by superposition synthesis, focal length synthesis and time synthesis?

Stacking synthesis "refers to stacking multiple photos together, which can simulate the function of slow door." For example, many photos of stars in the sky are superimposed and synthesized.

Coke segment synthesis: "I don't know the moon when I am young, and I am called Bai Yupan." The ancients have perfectly explained the phenomenon of "the near is big and the far is small" by perspective. Even if it is very big, it looks small enough as long as it is far enough from you. On the contrary, very small things are close enough to you. It will be big in the picture. Obviously, the full moon in the sky is dazzling, but there is only a white spot on the screen after shooting, and the camera's tolerance is far from enough for the eyes, which is the reason for perspective. So, we have to shoot with different focal lengths. A lens with a long focal length can magnify things in the distance, which naturally looks big. The same picture is shot with different focal lengths, a wide-angle shot and a telephoto shot. The near object shot with wide-angle and the far object shot with telephoto are combined, and the scenery is even more shocking.

Time synthesis: for example, shooting an island in the afterglow of sunset, if shooting at sunset, the sky is beautiful, but the lights on the island are not on yet, which is very stiff. If we wait until nightfall, all the lights on the island are on, but it is already dark and there is no bright spot. In order to solve the time contradiction, one can be taken at sunset and one at night when the light is turned on. The sunset sky of the former is combined with the island lights of the latter, and the whole picture looks very beautiful and gorgeous.