Question

grayscale is used it ​

Answer 1

Answer:

In digital photography, computer-generated imagery, and colorimetry, a grayscale or image is one in which the value of each pixel is a single sample representing only an amount of light; that is, it carries only intensity information. ... Grayscale images have many shades of gray in between.Grayscale images can be the result of measuring the intensity of light at each pixel according to a particular weighted combination of frequencies (or wavelengths), and in such cases they are monochromatic proper when only a single frequency (in practice, a narrow band of frequencies) is captured. The frequencies can in principle be from anywhere in the electromagnetic spectrum (e.g. infrared, visible light, ultraviolet, etc.).