Similarities and differences between analog images and digital images?

Traditional image recording devices that record images with film and tape, such as film cameras, tape cameras and film cameras, complete images called analog images. Electronic devices cannot transmit analog images. In the 1960s, when the United States planned to land on the moon, it was necessary to transmit the images on the moon to the earth. Invented the digital image, that is, the current digital technology, which can transmit the image to the earth through wireless devices on the moon. Picture digital technology is determined by pixels, and it is composed of 0-225 color levels from black to gray to white. Each pixel of the three primary colors also consists of 0-255 color levels. Each pixel is represented by a color code. The color code of a pixel is replaced by three letters. The codes of R, G and B are all 0, which means black. If the three-letter code is 255, it is white. If you want to send traditional analog images to the Internet, you must convert them into digital images through special equipment before you can use them.