What is hdr?

High dynamic range imaging (HDRI or HDR), in computer graphics and cinematography, is a set of techniques used to achieve a larger exposure dynamic range (that is, a greater difference between light and dark) than ordinary digital imaging techniques. The purpose of high dynamic range imaging is to accurately represent the brightness in the real world from direct sunlight to the darkest shadow.

DR is characterized by rich picture information and rich light and shadow details; Includes pre-shooting and post-processing; The effect of composite photos is different from that of secondary imaging and direct output of digital photos. There are certain technical requirements for photographers. These characteristics of HDR determine that it is only suitable for shooting some specific subjects.

Introduction to HDR application scenarios

Sunset, sunrise and night scene are good subjects for shooting HDR. The contrast between the sky and the scenery in this theme picture is great, and the dynamic range of digital camera can not meet such a large dynamic range, so it is the most suitable application theme for HDR. Especially when shooting night scenes, HDR can well show the contrast effect between the weak light in the sky and the ground light source, which can not be recorded in general night scenes.

When shooting indoors, the picture includes dark scenes indoors and very bright scenes outdoors, so that both indoor and outdoor scenes can be well displayed in this picture. In short, as long as the picture is relatively stable and the contrast between light and dark is large, it is all taken by HDR and synthesized by HDR post-processing.