vignetting

/ vɪˈnjɛtɪŋ /

noun

the technique of producing a photographic vignette, esp a portrait, by progressively reducing the amount of light falling on the photographic surface towards the edges
the reduction in area of a light beam passing through a camera lens as the obliquity of the beam is increased

This restriction is known as the “vignetting” action of the entrance luke.

The next methods of vignetting are dependent on simple laws of optics.

The halo was made by rubbing vignetting paste on the back, thus shutting out the light and leaving the paper its original hue.

In many cases vignetting is considered to be a merely mechanical61 operation, and very often looks like it.

There is another way of vignetting the sky into the landscape, which is, perhaps, better and more convenient.

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