| 单词 | keystone effect |
| 释义 | > as lemmaskeystone effect keystone effect n. chiefly Cinematography, Television, and Photography a distorting effect whereby a rectangular object produces a trapezoidal image, typically as a result of a line of projection, or an optical axis, not being at right angles to a screen. [With reference to the resemblance of such an image to the typical shape of the keystone of an arch.] ΚΠ 1911 Cycl. Motion-picture Work I. 58 The keystone effect may be entirely corrected for small angles by setting the lantern slide eccentric to the lens. 1967 Electronics 6 Mar. 79/1 (advt.) The electron gun is set at an angle to the phosphor and the deflection system compensates for keystone effects. 2010 F. Gallaugher Olympus E-P1 46 This feature is a godsend. It is particularly useful in controlling the keystone effect. < as lemmas |
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