What are the nine kinds of light and eleven kinds of light in photography?

There are nine kinds and eleven kinds of light commonly used in photography.

When you say light effect, you should mean the effect of eleven kinds of light.

For example, the sunshine on a cloudy day is omnidirectional light. When the light is placed on the side of the subject and hits the face of the subject, the light and shade effect will appear. Half of the face is bright and the other half is dark. So it's called cloudy sunshine.

There are also flat light, feather light, butterfly shadow light, triangle light, U-shaped light, cross light, wave light, crocodile light, sandwich light and surround light.

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