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<ul class="navigation"><li class="prev"><a accesskey="p" class="prev" href="WSF65FB40F-00F5-445a-BD9A-38B3737A9A19a.html" title="校正镜头扭曲并调整透视"><img src="images/blank.gif" alt="上一页" width="17" height="17" /></a></li><li class="next"><a accesskey="n" class="next" href="WSB5D75388-8DC6-4c2d-B274-D311CE624673a.html" title="调整图像锐化程度和模糊程度"><img src="images/blank.gif" alt="下一页" width="17" height="17" /></a></li></ul><div class="hierarchy"><a href="WSfd1234e1c4b69f30ea53e41001031ab64-763ea.html">修饰和变换</a> /
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                    减少图像杂色和 JPEG 不自然感
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                <div><div class="section"><p>图像杂色显示为随机的无关像素，这些像素不是图像细节的一部分。如果在数码相机上用很高的 ISO 设置拍照、曝光不足或者用较慢的快门速度在黑暗区域中拍照，则可能会导致出现杂色。相对于高端相机而言，低端消费者相机通常会产生更多的图像杂色。扫描的图像可能有由扫描传感器导致的图像杂色。通常，扫描的图像上会出现胶片的微粒图案。</p>
<p>图像杂色可能会以如下两种形式出现：明亮度（灰度）杂色，这些杂色使图像看起来斑斑点点；以及颜色杂色，这些杂色通常看起来像是图像中的彩色伪像。 </p>
<p>明亮度杂色在图像的某个通道（通常是蓝色通道）中可能更加明显。您可以在“高级”模式下单独调整每个通道的杂色。在打开滤镜之前，请检查图像中的每个通道，以确定某个通道中是否有很多杂色。通过校正一个通道而不是对全部通道进行整体校正，您可以保留更多的图像细节。</p>
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<ol><li class="stepexpand"><span>选取“滤镜”&gt;“杂色”&gt;“减少杂色”。</span></li>
<li class="stepexpand"><span>放大预览图像，以便能够更清楚地查看图像杂色。</span></li>
<li class="stepexpand"><span>设置选项：</span> <dl><dt class="dlterm">强度</dt>
<dd>控制应用于所有图像通道的明亮度杂色减少量。</dd><p class="dlseparator"></p><dt class="dlterm">保留细节</dt>
<dd>保留边缘和图像细节（如头发或纹理对象）。如果值为 100，则会保留大多数图像细节，但会将明亮度杂色减到最少。平衡设置“强度”和“保留细节”控件的值，以便对杂色减少操作进行微调。</dd><p class="dlseparator"></p><dt class="dlterm">减少杂色</dt>
<dd>移去随机的颜色像素。值越大，减少的颜色杂色越多。</dd><p class="dlseparator"></p><dt class="dlterm">锐化细节</dt>
<dd>对图像进行锐化。移去杂色将会降低图像的锐化程度。稍后可使用对话框中的锐化控件或其它某个 Photoshop 锐化滤镜来恢复锐化程度。</dd><p class="dlseparator"></p><dt class="dlterm">移去 JPEG 不自然感</dt>
<dd>移去由于使用低 JPEG 品质设置存储图像而导致的斑驳的图像伪像和光晕。</dd><p class="dlseparator"></p></dl>
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<li class="stepexpand"><span>如果明亮度杂色在一个或两个颜色通道中较明显，请单击“高级”按钮，然后从“通道”菜单中选取颜色通道。使用“强度”和“保留细节”控件来减少该通道中的杂色。</span></li>
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