Principle of criminal technology side lighting method

According to the query related information, display: shadow principle. In the case of uneven light, the shadow of the face will deepen, forming the shadow principle, and the outline of the line is always three-dimensional. When using sidelight, pay attention to the light ratio, and the light ratio should not be too large. It should be controlled within the scope allowed by the camera, illuminate the characters and avoid the yin and yang faces.