Glossary for Geospatial Science

vignetting:� Darkening at the edges and corners of an optical image.� Vignetting occurs because lenses are physically unable to pass as much light to the fringe of an optical field as they do to its center.� Several techniques compensate for vignetting, but it is almost always present to some degree.� For color rasters, vignetting means that the color of a feature at the edge or corner of an image may not match the color of that same feature in the center.