| 单词 | step wedge |
| 释义 | > as lemmasstep wedge step wedge n. Photography a line of contiguous rectangles each of a uniform neutral shade but getting progressively darker from white (or light grey) at one end to black (or dark grey) at the other; also transferred. ΘΚΠ society > leisure > the arts > visual arts > photography > a photograph > qualities and effects > [noun] > contrast, etc. high contrast1895 gamma1903 contrast1911 step wedge1931 1931 Philos. Trans. (Royal Soc.) A. 230 91 The intensities were estimated by covering part of the lines with a step-wedge of aluminium foil..and making use of the known absorption-coefficient of aluminium for CuKα rays. 1936 F. R. Newens Technique Colour Photogr. (ed. 2) iii. 39 The print from the blue filter negative will show less contrast than the others... If the white end of the step wedge is white, then the black end will only be a dark grey. 1962 Which? May 135/1 A black and white film's characteristic curve can be obtained by photographing a grey step wedge..and measuring the densities of the grey steps in the picture in relation to their known real densities. 1971 Jrnl. Oil & Colour Chemists' Assoc. 54 881 A method of achieving this was evolved using a step-wedge produced by gradually increasing the exposure in strips across the film. < as lemmas |
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