vignetting

v. describe a scene or a person in a brief elegant fashion; make the edges of a picture fade gently into the background

In photography and optics, vignetting is a reduction of an image's brightness or saturation at the periphery compared to the image center.Although vignetting is normally unintended and undesired, it is sometimes purposely introduced for creative effect, such as to draw attention to the center of the frame. A photographer may deliberately choose a lens which is known to produce vignetting. It can also be produced with the use of special filters or post-processing procedures.
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A method of producing a band of colour or tone on a map or chart, the density of which is reduced uniformly from edge to edge. 1/2/74

En cartographie, technique consistant à utiliser une bande colorée dont la tonalité varie uniformément d'un bord à l'autre. 1/2/74

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