Technology

Topics:

• Surveying
• Remote Sensing
• Panoramic Photography
• Laser Scanning
• Kite Photography
• HDR Photography
• HDD Survey
• GPS Surveying
• Digital Video

HDR Photography

In computer graphics and cinematography, high dynamic range imaging (HDRI 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.

Source: Wikipedia: High Dynamic Range Imaging

For more information on the use of this technology in heritage documentation and Digital Preservation, please see the following articles in our Knowledgebase:

Creating HDR Images: Photography and Processing
Why Use HDR Photography: Practical Applications Past Hyper-Real Photos

References

• Debevec, P. and J. Malik. "Recovering High Dynamic Range Radiance Maps from Photographs." In SIGGRAPH 97 (August 1997): 369-378.
• Cohen, J., C. Tchou, T. Hawkins, and P. Debevec. "Real-Time High-Dynamic Range Texture Mapping." In Rendering Techniques 2001, S.J. Fortler and K. Myszkowski, eds., 313-320.
• Inanici, M. and J. Galvin. Evaluation of High Dynamic Range Photography as a Luminance Mapping Technique, LBNL Report, Berkeley: Lawrence Berkeley National Laboratory, 2004.
• Inanici, M. "Per-Pixel Lighting Data Acquisition and Analysis with High Dynamic Range Photography." CIE Midterm Meeting y Congreso Internacional de Illuminacion (2005).