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<html xmlns="http://www.w3.org/1999/xhtml">
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
    <title>3.4. 颜色到 Alpha</title>
    <link rel="stylesheet" href="gimp-help-plain.css" type="text/css" />
    <link rel="stylesheet" href="gimp-help-screen.css" type="text/css" />
    <meta name="generator" content="DocBook XSL Stylesheets V1.66.1" />
    <link rel="start" href="index.html" title="&#10;      &#10;    " />
    <link rel="up" href="ch06s03.html" title="3. 颜色滤镜" />
    <link rel="prev" href="ch06s03s03.html" title="3.3. 单色化" />
    <link rel="next" href="ch06s03s05.html" title="3.5. 合成" />
  </head>
  <body>
    <div xmlns="" class="navheader">
      <table width="100%" summary="Navigation header">
        <tr>
          <th colspan="3" align="center" id="chaptername">3.4. 颜色到 Alpha</th>
        </tr>
        <tr>
          <td width="20%" align="left"><a accesskey="p" href="ch06s03s03.html">上一页</a> </td>
          <th width="60%" align="center" id="sectionname">3.4. 颜色到 Alpha</th>
          <td width="20%" align="right"> <a accesskey="n" href="ch06s03s05.html">下一页</a></td>
        </tr>
      </table>
      <hr />
    </div>
    <div class="sect2" lang="zh_CN" xml:lang="zh_CN">
      <div class="titlepage">
        <div>
          <div>
            <h3 class="title"><a id="plug-in-colortoalpha"></a>3.4. 颜色到 Alpha</h3>
          </div>
        </div>
      </div>
      <a id="id3319413" class="indexterm"></a>
      <div class="mediaobject">
        <img src="../images/filters/filters-color-colortoalpha.png" />
      </div>
      <div class="simplesect" lang="zh_CN" xml:lang="zh_CN">
        <div class="titlepage">
          <div>
            <div>
              <h4 class="title"><a id="id3319881"></a>概述</h4>
            </div>
          </div>
        </div>
        <p>
      该滤镜在<span class="guimenuitem">图像&gt;滤镜/颜色/颜色到 Alpha</span>。
    </p>
        <p>
      颜色到 Alpha 滤镜使所有包括指定颜色的像素变透明,同时会产生一个 Alpha 通道。它使用一种半智能的方式保存边缘平滑信息,即用弱 Alpha 信息替代弱的颜色信息。这样,包含指定颜色的区域将出现与周围像素相混合的现象。
    </p>
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      <div class="simplesect" lang="zh_CN" xml:lang="zh_CN">
        <div class="titlepage">
          <div>
            <div>
              <h4 class="title"><a id="id3319925"></a>选项</h4>
            </div>
          </div>
        </div>
        <div class="variablelist">
          <dl>
            <dt>
              <span class="term">颜色</span>
            </dt>
            <dd>
              <p>
            点击<span class="guilabel">从</span>颜色条会唤出颜色选择对话框。当要选取一个精确的颜色时,使用颜色拾取工具,然后将颜色拾取中的颜色拖拉到该颜色条中。在该颜色条上点击右键会出现一个可以选择背景色,前景色,白色和黑色的菜单。
          </p>
            </dd>
          </dl>
        </div>
      </div>
    </div>
    <div class="navfooter">
      <hr />
      <table width="100%" summary="Navigation footer">
        <tr>
          <td width="40%" align="left"><a accesskey="p" href="ch06s03s03.html">上一页</a> </td>
          <td width="20%" align="center">
            <a accesskey="u" href="ch06s03.html">上一级</a>
          </td>
          <td width="40%" align="right"> <a accesskey="n" href="ch06s03s05.html">下一页</a></td>
        </tr>
        <tr>
          <td width="40%" align="left" valign="top">3.3. 单色化 </td>
          <td width="20%" align="center">
            <a accesskey="h" href="index.html">起始页</a>
          </td>
          <td width="40%" align="right" valign="top"> 3.5. 合成</td>
        </tr>
      </table>
    </div>
  </body>
</html>