In computer graphics and cinematography, high dynamic range imaging or photography (HDR for short) is a set of techniques that allow a far greater dynamic range of exposures than normal digital imaging techniques. The intention is to accurately represent the wide range of intensity levels found in real scenes, ranging from direct sunlight to the deepest shadows. This provides the opportunity to shoot a scene and have total control of the final imaging from the beginning to the end of the photography project. An example would be that it provides the possibility to re-expose. One can capture as wide a range of information as possible on location and choose what is wanted later. Another example is rendering: where the envionment should be captured with as much range as possible because the brightest lights may be visible in some reflections, and the darkest shadows may be visible in other areas.
The banner above is an example of mulit-exposure (bracketed) scene that is then combined in the final processes to create an HDR photo:
For more additional information on Why and How to shoot HDR photography, see the following Knowledgebase articles:
Why use HDR Photography: Practical Applications past Hyper-Real Photos
Creating HDR Images: Photography and Processing
For more information on the technologies commonly employed in CyArk's Digital Preservation projects, see the Related Articles below.