| 单词 | acutance |
| 释义 | acutance|əˈkjuːtəns|
[f. acute a. + -ance.]
1. The sharpness of a photographic or printed image; a numerical measure of this.
1957T. L. J. Bentley Man. Miniature Camera (ed. 5) vi. 82 The sharpness of the edge of hard lines is now becoming known by such terms as ‘acutance’, ‘edge sharpness’, [etc.]. 1967E. Chambers Photolitho-Offset 268 Acutance, physical measure of image sharpness intended to correlate with the visual assessment of sharpness. 1979Mod. Photogr. Dec. 206/1 CU's hazily described test for sharpness is more like a test for film acutance which must be measured by a microdensitometer. 1986Photographer May 71/2 The resultant negs showed good tone range with even grain structure, good acutance and no loss of film speed.
2. Special Comb.: acutance developer, a photographic developer formulated to increase the acutance of the developed image.
[1962M. L. Haselgrove Photographer's Dict. 77 High-acutance developers.] 1971R. E. Jacobsen L. P. Clerc's Photogr. (ed. 4) IV. xxix. 523/2 A typical *acutance developer formula is given below. 1979SLR Camera June 113/1 Indeed it may be worth using an acutance developer to further increase the apparent sharpness of contre-jour pictures. |
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