Contrast of brightness of black, white and gray in nine squares.

Composition method of photography and design. The brightness contrast of black, white and gray divides the whole picture area into 9 small areas, of which 4 corner areas are pure black or pure white, and the middle area is gray in different degrees. By using the contrast between these areas, the light and shade changes and layering of the picture are enhanced, and the picture is more vivid, powerful and vivid. Composition is an important basic skill in photography, design and other fields. In addition to contrasting the lightness of black, white and gray with nine squares, there are many other composition methods and principles, such as golden section, symmetry, regularity and repeatability.