What's the difference between digital images and analog images?

The characteristics of digital images are: large gray dynamic range; The density resolution is relatively high; Good linearity; Rich in levels; Post-processing can be performed; The radiation dose is small.

The so-called simulated image is a pattern that continuously and vividly represents another physical feature with an intuitive physical quantity. Its characteristics are: continuous, intuitive and easy to obtain. Image representation has the characteristics of overview and real-time dynamic acquisition.

However, the repeatability of the simulated image is poor, and once the image is imaged, it cannot be changed or post-processed; The dynamic range of gray scale is small.

Imaging types: one is digital and the other is analog;

Imaging characteristics: first, one acquisition and multiple imaging; One is set and fixed.

Storage and transmission methods: one is filmless and soft transmission; One is hard storage and transmission.