Indicates the brightness of the surface color of an object.

Brightness is a physical quantity representing the color brightness of an object surface.

Brightness is the eye's perception of the brightness of light source and object surface, which is mainly a visual experience determined by the intensity of light. For the color of light source, the brightness value is related to the brightness of luminous body; For the color of the object, this value is related to the transmittance or reflectivity of the object. Typical values range from 0% (black) to 100% (white).

Knowledge expansion

First, the lightness of color.

In chromatics, lightness refers to the brightness or lightness of a color. It is determined by the amount of reflected light or transmitted light of the color. Different colors reflect light differently, so the brightness is different. For example, the white surface can reflect most of the light, so the brightness is high; The black surface hardly reflects light, so the brightness is very low.

Brightness also plays an important role in color mixing. If two colors are mixed together, their brightness will be somewhere in between. For example, when yellow and blue are mixed together, the mixed color will appear green with medium brightness.

Second, the lightness of visual art.

In visual arts, light is a very important way of expression. Artists can express the emotion and atmosphere of their works by adjusting the lightness of colors. For example, high-brightness colors can convey a relaxed, bright and fresh feeling, while low-brightness colors can convey a heavy, gloomy and mysterious feeling.

In painting, artists usually use colors with different lightness to express the three-dimensional sense and spatial sense of objects. For example, when painting a landscape painting, artists can use high-brightness colors to represent the sky and water surface, and low-brightness colors to represent mountains and trees, thus creating a profound sense of space.

Thirdly, lightness in photography.

In photography, lightness is also of great significance. Photographers can express the emotion and atmosphere of their works by adjusting the brightness of their photos. For example, low-brightness photos can show a deep, mysterious and powerful feeling, while high-brightness photos can show a fresh, bright and pleasant feeling.

In addition, in photography, lightness can also be used to control the contrast and contrast of photos. If the photographer wants to increase the contrast and contrast of the photo, he can reduce the brightness of the photo; If you want to reduce the contrast and contrast of photos, you can improve the brightness of photos.

In a word, lightness is a very important concept in visual arts and photography. Artists and photographers express the emotion and atmosphere of their works by adjusting the brightness of colors or photos, and enhance the expressive force and appeal of their works.