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<ul class="navigation"><li class="prev"><a accesskey="p" class="prev" href="WS41ACA5BD-922A-4281-854D-C4BB16276DFEa.html" title="使用应用图像命令混合通道"><img src="images/blank.gif" alt="上一页" width="17" height="17" /></a></li><li class="next"><a accesskey="n" class="next" href="WS359FFBCD-F419-447b-91E3-5CE7267037CAa.html" title="相加和减去混合模式"><img src="images/blank.gif" alt="下一页" width="17" height="17" /></a></li></ul><div class="hierarchy"><a href="WSfd1234e1c4b69f30ea53e41001031ab64-7701a.html">选区和蒙版</a> /
     <a href="WSCB346BE1-FE43-4cbb-8606-B26EFF1298A9a.html"><b>通道计算</b></a> 
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                    使用计算命令混合通道
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                <div><div class="section"><p>“计算”命令用于混合两个来自一个或多个源图像的单个通道。然后可以将结果应用到新图像或新通道，或现用图像的选区。不能对复合通道应用“计算”命令。</p>
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<ol><li class="stepexpand"><span>打开一个或多个源图像。 </span> <div class="note"><span class="notetitle">注：  </span>如果使用多个源图像，则这些图像的像素尺寸必须相同。</div>
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<li class="stepexpand"><span>选取“图像”&gt;“计算”。 </span></li>
<li class="stepexpand"><span>要在图像窗口中预览效果，请选择“预览”。</span></li>
<li class="stepexpand"><span>选取第一个源图像、图层和通道。要使用源图像中所有的图层，请选取“合并图层”。 </span></li>
<li class="stepexpand"><span>要在计算中使用通道内容的负片，请选择“反相”。对于“通道”，如果要复制将图像转换为灰度的效果，请选取“灰色”。</span></li>
<li class="stepexpand"><span>选取第二个源图像、图层和通道，并指定选项。 </span></li>
<li class="stepexpand"><span>对于“混合”，选取一种混合模式。 </span> <p>有关“相加”和“减去”选项的信息，请参阅<a href="WS359FFBCD-F419-447b-91E3-5CE7267037CAa.html">相加和减去混合模式</a>。有关其它混合选项的信息，请参阅<a href="WSfd1234e1c4b69f30ea53e41001031ab64-77e9a.html">混合模式列表</a>。</p>
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<li class="stepexpand"><span>输入不透明度值以指定效果的强度。 </span></li>
<li class="stepexpand"><span>如果要通过蒙版应用混合，请选择“蒙版”。然后选择包含蒙版的图像和图层。对于“通道”，可以选择任何颜色通道或 Alpha 通道以用作蒙版。也可使用基于现用选区或选中图层（透明区域）边界的蒙版。选择“反相”反转通道的蒙版区域和未蒙版区域。</span></li>
<li class="stepexpand"><span>对于“结果”，指定是将混合结果放入新文档、还是现用图像的新通道或选区。 </span></li>
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