How to take a second exposure photo?

First, the shooting conditions overlap exposure, generally need to shoot in indoor light, no occlusion, no traces of image overlap on the screen. To use this stunt, you need to meet the following conditions: 1. 1, and you need a black background, so that multiple exposures will not destroy the clarity of the image. 1.2. When the subjects are exposed one after another, they should wear clothes with different shades, so that the overlapping parts of the clothes on the image are closely connected without showing traces. 1.3, you need to use a frosted glass camera to focus on the view, so as to accurately arrange the image position. Second, the light requires overlapping exposure. This photo was taken after many exposures. Although the light consumption is basically the same as that of general figure photography, there are two specific requirements: 2. 1, light source position, brightness, light-dark ratio and light-shadow effect, all of which are required to be consistent. 2.2. Decorative lights can be used on the clothes and hair of the characters, which can show a sense of space between the characters and the black background. However, the clothes at the junction of the two portraits should not be decorated with lights to avoid revealing flaws. Third, the shooting method takes the double half-length photo exposed twice as an example, and briefly describes the shooting method of overlapping exposure: 3. 1 The subject of the first exposure should wear dark clothes, especially the figure at the back, with a slightly higher position and a slightly inward body direction. After focusing, you can draw the outline of the image on the ground glass with a pencil, so that you can arrange the position of another image for the second exposure. Then, the first exposure can be made. 3.2. The subject of the second exposure should wear light-colored clothes, and as a figure close to the front, take photos according to the outline of the first exposure image on the ground glass, and arrange the position and posture appropriately so as to coordinate with the previous image. Then, a second exposure can be made. 3.3. If it is necessary to show that the hand of the person behind is placed on the shoulder of the person in front, then in the second exposure, you can borrow someone else's hand and put it on the shoulder of the subject wearing light clothes, but you should prevent another person from being photographed. 3.4. If you want to make the person's head and face slightly larger to conform to the law of perspective, you can move the camera closer and make a second exposure. Because the background is black, the image will not be disturbed.