什么是色彩管理（续）

colorgain

< class=MsoNormal><B><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">参考色空间</SPAN><SPAN lang=EN-US><?xml:namespace prefix = o ns = "urn:schemas-microsoft-comfficeffice" /><o:p></o:p></SPAN></B>
< class=MsoNormal style="TEXT-INDENT: 17.95pt; mso-char-indent-count: 1.71; mso-char-indent-size: 10.45pt"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">今天我们使用的色彩管理系统实际上使用了两个参考色空间，分别被称作</SPAN><SPAN lang=EN-US>CIE XYZ(1931)</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">和</SPAN><SPAN lang=EN-US>CIE Lab(1976)</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。我们已经在上一讲里了解到关于这两个色空间的较为详细的说明。要想明白色彩管理系统是如何工作的，对于这两个色空间你只需要了解两件事情：</SPAN>
< class=MsoNormal style="MARGIN-LEFT: 21pt; TEXT-INDENT: -21pt; mso-list: l0 level1 lfo12; tab-stops: list 21.0pt"><SPAN lang=EN-US style="FONT-FAMILY: Wingdings"><SPAN style="FONT: 7pt 'Times New Roman'">         </SPAN></SPAN><SPAN lang=EN-US>Lab</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">是</SPAN><SPAN lang=EN-US>XYZ</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的数学等价变换</SPAN>
< class=MsoNormal style="MARGIN-LEFT: 21pt; TEXT-INDENT: -21pt; mso-list: l0 level1 lfo12; tab-stops: list 21.0pt"><SPAN lang=EN-US style="FONT-FAMILY: Wingdings"><SPAN style="FONT: 7pt 'Times New Roman'">         </SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">无论</SPAN><SPAN lang=EN-US>XYZ</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">还是</SPAN><SPAN lang=EN-US>Lab</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">描述的色彩都是根据我们人类的感觉来定义的，而不是象那些产生色彩的设备一样通过控制的电信号来产生色彩。换句话说，这两个颜色空间所定义的颜色都是一个有着正常视觉的人可以看见的，这个人我们在上一节课已经认识了，叫做“标准观察者</SPAN><SPAN lang=EN-US>1931</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">”。其结果就是，</SPAN><SPAN lang=EN-US>XYZ</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">和</SPAN><SPAN lang=EN-US>Lab</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的值定义的颜色都是明确的，而不是像</SPAN><SPAN lang=EN-US>RGB</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US>CMYK</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">这些设备相关的色空间模型，虽然知道了数值，但如果不指明具体设备，还是不能预知确切的颜色。</SPAN>
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