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vignetting

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vignetting,
the peripheral reduction of light intensity in fluoroscopic image intensifiers.
vignetting [vin-yet´ing]
the presence of a brighter light intensity at the center of the fluoroscopic image on an image intensifier than at the periphery of the field.
vignetting
a grid fault in x-ray technology causing areas of peripheral underexposure.
vignetting 
1. A graduated reduction in retinal illuminance due to light reaching the pupil at very oblique angles.
2. The difference in absorption between the two portions of photochromic fused bifocal lenses when the segment is not made of photochromic glass. See photochromic lens; retinal illuminance.
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[ILLUSTRATION OMITTED] These are examples of photographs that belong in the Open category but which some may consider borderline and, in some cases, Creative: Borders and Frames Vignetting is often used as a framing effect.
Judging what is a creative photograph--and what is not: PSA ... by News, Janie / PSA Journal
There can be vignetting, where a photo's brighter center fades evocatively toward the edges.
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However, as it relies on an analysis of the gray levels that is global, it is not well suited to tasks where the statistical aspects of the gray levels vary within the image, such as may typically be the ease with natural images which introduce shadows, vignetting, and overall gradients due to directional illumination.
Halton sampling for image registration based on mutual information by Thevenas, Philippe; Bierlaire, Michael; Unser, Michael / Sampling Theory in Signal and Image Processing
 
 
 
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