What are the precautions for high-profile photography?

The concept of high-profile photography: in a picture, the tones composed of gray, light gray and white account for a large proportion, while the tones composed of dark gray and black account for a small proportion. Precautions for high-profile photography: 1 Background: light color, no obvious projection; 2 clothing: light should be shallow, but not deep; 3 light: generally, it is mainly along the light, with small contrast, inconspicuous level change, delicate character texture and less projection. 4 exposure: when taking high-profile photos, it is appropriate to skip exposure. First, in a large area of light color, in the dark (such as hair), it is still necessary to express levels and increase exposure, which is easy to meet his needs. Instead, it is necessary to appropriately increase the exposure to make the film density slightly higher, and it is easy to achieve white when making high-definition photos. But the exposure should be appropriate, not too big. I hope I can help you ~