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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク CIE 1964 color space ： ウィキペディア英語版 CIE 1964 color space The CIE 1964 (''U'' *, ''V'' *, ''W'' *) color space, also known as CIEUVW, is based on the CIE 1960 UCS: :$U^$ *=13W^ *(u-u_0), \quad V^ *=13W^ *(v-v_0), \quad W^ *=25Y^-17 where is the white point and ''Y'' is the luminous tristimulus value of the object. The asterisks in the exponent indicates that the variable represent a more perceptually uniform color space than its predecessor (compare with CIELAB). Wyszecki invented the UVW color space in order to be able to calculate color differences without having to hold the luminance constant. He defined a lightness index ''W'' * by simplifying expressions suggested earlier by Ladd and Pinney, and Glasser ''et al.''. The chromaticity components ''U'' * and ''V'' * are defined such that the white point maps to the origin, as in Adams chromatic valence color spaces. This arrangement has the benefit of being able to express the loci of chromaticities with constant saturation simply as for a constant ''C''. Furthermore, the chromaticity axes are scaled by the lightness "so as to account for the apparent increase or decrease in saturation when the lightness index is increased or decreased, respectively, and the chromaticity is kept constant".〔 ==Chromaticity and color difference== The chromaticity co-efficients were chosen "on the basis of the spacing of the Munsell system. A lightness difference is assumed to correspond to a chromatic-ness difference $\backslash sqrt\; =\; 13$ (approximately)."〔 ''Note:'' The asterisks are not used in the paper.〕 With the co-efficients thus selected, the color difference in CIEUVW is simply the Euclidean distance: $\backslash Delta\; E\_=\backslash sqrt$ 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「CIE 1964 color space」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.