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<h3 class="title"><a id="plug-in-colortoalpha"></a>3.4. 颜色到 Alpha</h3>
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该滤镜在<span class="guimenuitem">图像>滤镜/颜色/颜色到 Alpha</span>。
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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。
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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。
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