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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. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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