What do you mean by five tones of light and shade?

Five tones of light and shade are professional terms used in sketch teaching in western painting system.

Five tones: refers to the change law of light and shade of objects with a certain physical structure and material in different areas after being affected by light.

Highlight: the brightest spot of a light-receiving object, showing the part of the object that directly reflects the light source, which is more common in smooth objects.

Bright gray: the area between highlights and the dividing line between light and dark.

Light-dark boundary: the area that distinguishes the bright part from the dark part of an object, which is usually the structural turning point of the object. The dividing line between light and dark does not refer to any particular line. Its shape, brightness and realism will change with the structural transition of the object. )

Reflection: a part of the backlight of an object, which is influenced by the reflected light of other objects or the environment in which the objects are located.

Projection: the shadow produced in space after the object itself blocks the light.

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Light and dark sketch is to shape objects with the tone of light and dark. Its main method is to reflect the volume, space, realism and structure of objective objects through the expression of five colors: highlight, bright surface, light and dark boundary, dark surface and reflection, and emphasize the intuitive authenticity of sketch art.