What is the meaning of the 'HDR technique' in photography?
A High Dynamic Range (HDR) image represents the whole range of values of light reflected by a scene, from its deepest shadows to brightest highlights. In order to store the range of values with sufficient precision, HDR images are stored in floating-point representation, which is why they are referred to as 32-bit images (32 bits/channel) as the floating point type is encoded with 32 bits in computing.
The dynamic range of real-world scenes is often much higher than the dynamic range digital cameras can capture. For this reason, a single photograph, regardless of whether it is a RAW or jpeg file, is considered Low Dynamic Range as the camera sensors can only capture partially the dynamic range of a scene. The part of the range captured depends on the exposure setting. Capturing the dynamic range in its totality requires therefore to take multiple exposures.
So, in order to create an HDR image, you will first need to take several exposures of the scene. Then, Photomatix will combine the photos under different exposures and create a 32-bit HDR image from them. The number of photos needed depends on the dynamic range of the scene considered as well as the EV spacing separating the exposures.
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For more information on how to shoot a High Dynamic Range scene, visit the Photomatix web site http://www.hdrsoft.com/
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