Below is a figure of a Nikon DSLR with the bracketing settings displayed and highlighted by the red box. Some SLR cameras can auto-bracket for you please read your camera’s manual to determine if this is possible and, if so, how to adjust the settings appropriately. frames progressively brighter, and one, two, three, etc. Exposure bracketing means taking an image for the scene at a given exposure and then taking one, two, three, etc. For the purposes of producing HDRIs, we will want to bracket the exposure. ‘Bracketing’ in photography is the technique in which a scene or subject is photographed multiple times with different camera settings (the specific settings bracketed can vary, and may include focus, flash, white balance, and exposure). Most HDR software suggests/requires at least three bracketed images, but, as stated in the Why HDRI blog, the more the better! To begin, in order for the algorithms to calculate a response curve, there must be, at minimum, two photographs of the scene (but the more photographs, the more detail can be recovered and visible in the resulting HDRI). This paper is available from Debevec’s website.Īs Debevec’s work has been employed in various software packages, including Adobe Photoshop and the very good Photomatix program, we will not cover the science and engineering research in detail, but rather the photographers’ steps to making an HDR image. This paper is very technical and includes the algorithm equations used to recover the film/camera response curve used to nonlinearly map pixel values found in standard images in order to produce true, absolute radiance values in HDRI. In 1997, Paul Debevec published a paper about how to digitally create high dynamic range images for rendering surfaces.
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