| 释义 |
viˈgnetting, vbl. n.
[f. vignette v.]
1. a. The action or process of producing vignettes, esp. in photography.
1842E. A. Poe in Graham's Mag. Apr. 201/1 The peculiarities of the design, of the vignetting and of the frame. 1885Pall Mall G. 7 May 11/2 The vignetting is, without doubt, the most difficult form of printing. 1889Anthony's Photogr. Bull. II. 227 Generally, unless vignetting is desired, the background may be made of hangings of some rough material, absorbent of light.
b. attrib., as vignetting glass, vignetting mask, vignetting table, etc.
1889Anthony's Photogr. Bull. II. 261 For quarter-plates and half-plates, the vignetting mask should be about three-quarters of an inch from the negative. 1892Photogr. Ann. II. p. clxxix, Vignetting Glasses. Ibid. 486 Revolving Vignetting Table.
2. Optics. A dimming or disappearance of an image at its edge as a result of the blocking of some off-axis rays during their passage through the optical system.
1930L. B. W. Jolley et al. Theory & Design Illuminating Engin. Equipment xxix. 449 This vignetting effect may result in a reduction in the illumination towards the edges of the image even in the most carefully designed lenses. 1959Born & Wolf Princ. Optics iv. 187 Designers sometimes rely on vignetting to obliterate undesirable off-axis aberrations. 1973Optical Engin. XII. 20/2 A 1 mm diameter pinhole in 1·5 mm lead severely vignettes the field off-axis. 1974Sci. Amer. Mar. 112/1 The diameter of the mirrors..must be at least as large as the ruled area of the gratings to prevent vignetting..and the scattering of stray light into the image. 1978SLR Camera Aug. 64/1 The negative had good contrast and no discernible vignetting. |