How to understand light ratio in photography?

Light ratio refers to the light intensity difference between the bright part and the dark part of the subject. When the light is large, the contrast between the bright part and the dark part on the subject is large, and vice versa. Usually, the intensity of the main light and the auxiliary light and the distance from the subject determine the light ratio. So there are two ways to adjust the light ratio when shooting: ① adjust the intensity of the main light and the auxiliary light. Strengthening the intensity of main light or weakening the intensity of auxiliary light will increase the light ratio; On the contrary, the light ratio becomes smaller; ② Adjust the distance between the main light and the auxiliary light and the subject. Reducing the distance between the main lamp and the subject or increasing the distance between the auxiliary lamp and the subject will increase the light ratio, and vice versa.

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