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<HTML><HEAD><TITLE>Xlib Programming Manual: CIELab Queries</TITLE></HEAD><BODY><H1 ALIGN=center>6.11.2 CIELab Queries</H1>The following equations are useful in describing the CIELab query functions:<P><!.IN "Psychometric Hue Angle"><!.IN "CIE metric lightness"><!.IN "Psychometric Chroma"><!.IN "Psychometric Chroma" "maximum"><BLOCKQUOTE><I>CIELab Psychometric Chroma = sqrt(a_star<SUP>2</SUP> + b_star <SUP>2</SUP> )<P>CIELab Psychometric Hue = tan<SUP>-1</SUP> ( b_star / a_star )</I></BLOCKQUOTE>To obtain the CIE L*a*b* coordinates of maximum Psychometric Chromafor a given Psychometric Hue Angle and CIE metric lightness (L*), use<B><A HREF="XcmsCIELabQueryMaxC.html">XcmsCIELabQueryMaxC()</A></B>.<P>To obtain the CIE L*a*b* coordinates of maximum CIE metric lightness (L*)for a given Psychometric Hue Angle and Psychometric Chroma, use<B><A HREF="XcmsCIELabQueryMaxL.html">XcmsCIELabQueryMaxL()</A></B>.<P>To obtain the CIE L*a*b* coordinates of maximum Psychometric Chromafor a given Psychometric Hue Angle, use<B><A HREF="XcmsCIELabQueryMaxLC.html">XcmsCIELabQueryMaxLC()</A></B>.<P>To obtain the CIE L*a*b* coordinates of minimum CIE metric lightness (L*)for a given Psychometric Hue Angle and Psychometric Chroma, use<B><A HREF="XcmsCIELabQueryMinL.html">XcmsCIELabQueryMinL()</A></B>.<H5 ALIGN=right><I>Next: <A HREF="cieluv.html">CIELuv Queries</A></I></H5><HR><ADDRESS><A HREF="http://tronche.lri.fr:8000/">Christophe Tronche</A></ADDRESS></BODY></HTML>⌨️ 快捷键说明
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