How does an indoor portrait camera measure light?

There are two kinds of indoor portrait shooting. One is on-site light photography, which uses the light from the scene as the only light source to shoot images, such as the light projected by the window, candlelight, fireplace fire and so on. This kind of photography is generally that you arrange the subject in the brightest place, and when you measure the light, you measure the brightest place and leave the details of the dark part, which can show the sense of reality.

There is also an indoor portrait that uses artificial light, that is to say, a photographic lamp is used to distribute the light. Generally, a main light, an auxiliary light and a background light are needed (of course, other lights can be added, such as contour lights, headlights and eye lights. ). The main light is generally set at the 45-degree angle of the subject, and the auxiliary light is set at the nearest position to the camera, which can soften the shadow caused by the main light. There is a question of light ratio. The light ratio of a general digital camera is 1: 2. As long as this light ratio is set, exposure can be carried out according to the strong light area, which means that the main light is twice as bright as the auxiliary light. The background light is set behind the subject to illuminate the background, making the subject stand out in the background.

I hope it will help the landlord.