What is the significance of photography h d r effect?

HDR is short for High Dynamic Range (HDR), which means High Dynamic Range. It refers to images with great differences in brightness. Usually in nature, the light emitted by the brightest sun and the darkest place is measured according to the working range of the exposure meter, and the maximum difference is 15~20 or even higher; The human eye can only recognize 9~ 1 1, and the photographic difference of the film is 3~4, which means that the best digital photosensitive element in Switzerland can only record scenes with a light ratio of 5~6 at the same time. But in reality, there are often pictures with brightness level difference greater than 6, so people invented this HDR recording method: it is a method of recording more than three pictures from the darkest to the brightest, and then processing them into the same image with dark details, medium brightness details and highlights in a computer equipped with professional software.