Sony Z 1 l39h takes pictures at night, and the screen is full of Xue Huadian, which is very serious!

Xue Huadian on the screen when taking pictures at night is the so-called noise;

If you want to take photos at night, you can use manual mode, and then set ISO to 400 or lower.

The noise of digital camera mainly refers to the rough part of the image produced by CCD(CMOS) in the process of receiving light and outputting it, and also refers to foreign pixels that should not appear in the image, usually caused by electronic interference.

It looks like the image has been dyed and covered with some tiny rough spots. Digital photos taken at ordinary times may not be noticed if you use a personal computer to reduce the high-quality images and then look at them. However, if the original image is enlarged, there will be a color (pseudo-color) that did not exist originally, and this pseudo-color is image noise.