What are the meanings of lightness, purity and hue in composition?

"Brightness" refers to the brightness of a color. White has the highest brightness and black has the lowest brightness. Different shades have different lightness. Yellow has high brightness, while red and blue have low brightness. Any hue, such as white, will improve the brightness, and the more white components, the higher the brightness; If any hue is adjusted to black, the brightness is relatively reduced, and the darker the color, the brighter the brightness.

Purity refers to the pure saturation of color. If the colors of other components are not mixed, the colors of different shades are pure.

Triangular composition: Objects and figures are distributed on the canvas according to triangles. According to my own understanding, there are many kinds of expressions. Generally, the main object is placed in a prominent position, with the main body as the focus, and other objects are surrounded by triangles.

Other compositions: S-shaped composition, triangle composition, C-shaped composition, trapezoid composition, full composition, sparse composition, L-shaped composition, U-shaped composition, division, herringbone composition, corner composition, juxtaposition, vertical composition, high-low composition (hook type), diagonal line, trapezoid composition, ring shape and so on.