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<HTML><HEAD><TITLE>Xlib Programming Manual: CIELuv Queries</TITLE></HEAD><BODY><H1 ALIGN=center>6.11.3 CIELuv Queries</H1>The following equations are useful in describing the CIELuv query functions:<P><!.IN "Psychometric Hue Angle"><!.IN "CIE metric lightness"><!.IN "Psychometric Chroma"><!.IN "Psychometric Chroma" "maximum"><BLOCKQUOTE><I>CIELuv Psychometric Chroma = sqrt(u_star<SUP>2</SUP> + v_star<SUP>2</SUP> )<P>CIELuv Psychometric Hue = tan<SUP>-1</SUP> (v_star / u_star)</I></BLOCKQUOTE><P>To obtain the CIE L*u*v* coordinates of maximum Psychometric Chromafor a given Psychometric Hue Angle and CIE metric lightness (L*), use<B><A HREF="XcmsCIELuvQueryMaxC.html">XcmsCIELuvQueryMaxC()</A></B>.<P>To obtain the CIE L*u*v* coordinates of maximum CIE metric lightness (L*)for a given Psychometric Hue Angle and Psychometric Chroma, use<B><A HREF="XcmsCIELuvQueryMaxL.html">XcmsCIELuvQueryMaxL()</A></B>.<P>To obtain the CIE L*u*v* coordinates of maximum Psychometric Chromafor a given Psychometric Hue Angle, use<B><A HREF="XcmsCIELuvQueryMaxLC.html">XcmsCIELuvQueryMaxLC()</A></B>.<P>To obtain the CIE L*u*v* coordinates of minimum CIE metric lightness (L*)for a given Psychometric Hue Angle and Psychometric Chroma, use<B><A HREF="XcmsCIELuvQueryMinL.html">XcmsCIELuvQueryMinL()</A></B>.<H5 ALIGN=right><I>Next: <A HREF="tekhvc.html">TekHVC 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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