Light ratio popular explanation Guang ratio popular understanding

1. Light ratio is one of the important parameters in photography, which refers to the ratio of the brightness of the light-receiving surface of the subject to the brightness of the shadow surface. Under natural light and artificial lighting conditions, the light-receiving surface of the subject has higher brightness. Although the shadow surface does not receive direct light (or receives less light), it still has a certain brightness due to scattered light (or auxiliary light). The light ratio is commonly expressed in the form of "brightness of the light-receiving surface/brightness of the shadow surface".

2. Light ratio also refers to the ratio of the brightness of adjacent parts of the object, and the contrast between the bright and dark main parts of the object. If the light ratio is large, the contrast will be large; if the light ratio is small, the contrast will be small. The size of the light ratio determines the contrast between light and dark in the picture, forming different shades and tonal compositions. When shooting portraits, clever use of light ratio can effectively express the "hard" and "soft" characteristics of the subject. For example, a small light ratio is commonly used when photographing women and children, while a high light ratio is commonly used when photographing men and the elderly. Direct light is easier to form a large light ratio, while scattered light is easier to form a small light ratio.