Why do all the photos have a resolution of 72?

The automatic generation of ordinary digital cameras is set according to the resolution of LCD display, and the default is 72. If you need high resolution, you can change it yourself in PS, but the resolution improvement area of the film will be smaller when you change it generally, and the program will automatically add interpolation when you upgrade it forcibly, and the effect will be a bit blurred. This thing actually doesn't matter, the key is to look at the amount of data ~

Supplement:

You have a misunderstanding about digital cameras. Real digital cameras with high resolution and high-definition pictures cost more than 5,000 yuan, or even more. In fact, the definition of ordinary film cameras is much higher than that of ordinary household digital cameras. 135 (a common small negative in the past) The resolution of the camera is equivalent to12.5 megapixel digital camera and 120 (a kind of professional large negative). Do you still think film is worse than digital? The film is only a little thicker because of the material, and then the cost is high. In fact, the imaging is quite good, so many professional advertising photographers are still used to shooting with film.