Image noise

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Image noise is random variation of brightness or color information in images, and is usually an aspect of electronic noise. It can be produced by the image sensor and circuitry of a scanner or digital camera. Image noise can also originate in film grain and in the unavoidable shot noise of an ideal photon detector. Image noise is an undesirable by-product of image capture that obscures the desired information.
The generation of noise is mainly related to imaging devices, such as sensors and photosensitive elements. If the temperature of the device is too high, the noise signal is strong and the noise appears.

Of course, the noise is generated not only by the temperature, but also by the fact that the photosensitive area of the photosensitive element is too small. Because of the small photosensitive area, the efficiency of converting light into an image is low, resulting in the generation of noise.

For more: What is image noise? How to reduce image noise？

How to reduce the noise of the image?
First, you can choose to buy a camera with a large photosensitive area.
Secondly, in shooting parameters, the shutter time is appropriately extended. In this way, the temperature of the device is not as high.
And, of course, we can use other software to eliminate image noise.

Hope the answer can help you!