Grayscale can also be regarded as brightness, which is simply the depth of color. In fact, in our daily life, through the combination of the three primary colors, it can be composed of different colors. The greater the number of gray levels that the product can display, it means that the color expression of this product is more abundant, and it can achieve a stronger color level.

For example, three primary colors of 16-level grayscale, the color that can be displayed is 16×16×16=4096 colors. However, the current product 256-level grayscale is very common. The so-called color or gray level refers to the difference between the brightness and darkness of the display pixels in the black and white display. The color display shows the difference in color. The more gray levels, the clearer and more vivid the image level. The gray level depends on the number of refresh memory cells corresponding to each pixel and the performance of the display itself. If the color of each pixel is represented by a 16-bit binary number, we call it a 16-bit image, which can express 2 to the 16th power of 65536 colors.

If each pixel is represented by a 24-bit binary number, we call it a 24-bit image, which can express the 24th power of 2, that is, 16,777,216 colors. Grayscale means no color, and RGB color components are all equal. If it is a binary grayscale image, its pixel value can only be 0 or 1, we say its gray level is 2. Let's use an example to illustrate: A 256-level grayscale image, RGB (100, 100, 100) represents a grayscale of 100, RGB (50, 50, 50) represents a grayscale of 50, grayscale refers to black and white The color depth of the points in the image generally ranges from 0 to 255, white is 255, and black is 0, so black and white pictures are also called grayscale images. There are many uses in the field of medicine and image recognition. The grayscale of color images is actually in The pixel value after conversion into a black-and-white image (a broad term). The conversion method depends on the field of application. It is generally converted according to the weighting method. The ratio of R, G, and B is generally 3:6:1.