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<HTML><HEAD><TITLE>Xlib Programming Manual: Callback Functions</TITLE></HEAD><BODY><H1 ALIGN=center>6.10 Callback Functions</H1>This section describes the gamut compression and white pointadjustment callbacks.<P>The gamut compression procedure specified in the <A HREF="../conversion-contexts-and-gamut-mapping.html">CCC</A>is called when an attempt to convert a color specification from<B>XcmsCIEXYZ</B>to a device-dependent format (typically<B>XcmsRGBi</B>)results in a color that lies outside the screen's color gamut.If the gamut compression procedure requires client data, this data is passedvia the gamut compression client data in the <A HREF="../conversion-contexts-and-gamut-mapping.html">CCC</A>.<P>During color specification conversion between device-independentand device-dependent color spaces,if a white point adjustment procedure is specified in the <A HREF="../conversion-contexts-and-gamut-mapping.html">CCC</A>,it is triggered when the Client White Point and Screen White Point differ.If required, the client data is obtained from the <A HREF="../conversion-contexts-and-gamut-mapping.html">CCC</A>.<H5 ALIGN=right><I>Next: <A HREF="prototype-gamut-compression.html">Prototype Gamut Compression Procedure</A></I></H5><HR><ADDRESS><A HREF="http://tronche.com/">Christophe Tronche</A>, <A HREF="mailto:ch.tronche@computer.org">ch.tronche@computer.org</A></ADDRESS></BODY></HTML>⌨️ 快捷键说明
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