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Glossary > Photography >Vignetting
Vignetting
Vignetting is a darkening of the corners of an image, usually caused by light falling off toward the edge of the CCD chip due to the optical system. Typically vignetting is seen most prominently in fast-focal-ratio and wide-angle systems such as camera lenses. Vignetting is usually removed by using a flat field. A gradual reduction in density of parts of a photographic image due to the stopping of some of the rays entering the lens. A lens mounting may interfere with the extreme oblique rays. An antivignetting filter is one that gradually decreases in density from the center toward the edges; it is used with many wide-angle-lenses to produce a photograph of uniform density by cutting down the overexposure of the center of the photograph.
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