hdr means high dynamic range imaging. In computer graphics and cinematography, it is a set of technologies used to achieve a larger exposure dynamic range than ordinary digital image technology; the purpose of high dynamic range imaging It is about correctly representing the wide range of brightness in the real world, from direct sunlight to the darkest shadows.
The operating environment of this tutorial: Windows 7 system, Dell G3 computer.
What does hdr mean?
High Dynamic Range Imaging (English: High Dynamic Range Imaging, HDRI or HDR for short), in computer graphics and film photography, is used to achieve greater exposure dynamics than ordinary digital image technology A set of techniques that allow for greater range (i.e. greater light and dark differences). The purpose of high dynamic range imaging is to correctly represent the wide range of real-world brightness from direct sunlight to the darkest shadows.
HDR application scenarios
The characteristics of HDR are: large picture information content and rich light and shadow details; including both pre-shooting and post-processing Part; the effect of the synthesized photo is very different from that of secondary imaging and direct output digital photos; it has certain technical requirements for photographers. These characteristics of HDR determine that it is only suitable for shooting some specific themes. For example:
(1) Light photography. Since landscape photography often faces large light ratio images, it is very suitable for HDR technology.
(2) Still photography of flowers and plants. This type of subject matter is rich in color changes, light and shadow, and at the same time still, which is conducive to early photography.
(3) Sunset, sunrise and night scenes are all good subjects for HDR shooting. There is a great contrast between light and dark in the sky and surface scenes in this type of subject. The dynamic range of digital cameras cannot satisfy such a large dynamic range, so HDR is the most suitable application subject. Especially when shooting night scenes, HDR can well show the contrast between the weak light in the sky and ground sources that cannot be recorded in ordinary night scenes. [8]
(4) When shooting indoors, the picture includes dark indoor scenes and very bright outdoor scenes. HDR can make both indoor scenes and outdoor scenes well displayed in the photo. In short, As long as the scenes are relatively stable and have a large contrast between light and dark, they are shot using HDR techniques and synthesized through HDR post-processing.
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