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<ul class="navigation"><li class="prev"><a accesskey="p" class="prev" href="WSfd1234e1c4b69f30ea53e41001031ab64-739ba.html" title="用自由钢笔工具绘图"><img src="images/blank.gif" alt="上一页" width="17" height="17" /></a></li><li class="next"><a accesskey="n" class="next" href="WSfd1234e1c4b69f30ea53e41001031ab64-7399a.html" title="管理路径"><img src="images/blank.gif" alt="下一页" width="17" height="17" /></a></li></ul><div class="hierarchy"><a href="WSfd1234e1c4b69f30ea53e41001031ab64-73ada.html">绘图</a> /
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                <h1>
                    用磁性钢笔选项绘图
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                <div><div class="section"><p>磁性钢笔是自由钢笔工具的选项，它可以绘制与图像中定义区域的边缘对齐的路径。您可以定义对齐方式的范围和灵敏度，以及所绘路径的复杂程度。磁性钢笔和磁性套索工具共用很多相同的选项。</p>
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<ol><li class="stepexpand"><span>要将自由钢笔工具转换成磁性钢笔工具 <img src="images/magpen.png" />，请在选项栏中选择“磁性”，或单击选项栏中形状按钮旁边的反向箭头，选择“磁性”并进行下列设置:</span><ul><li><p>对于“宽度”，请输入介于 1 和 256 之间的像素值。磁性钢笔只检测从指针开始指定距离以内的边缘。</p>
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<li><p>为“对比”输入介于 1 到 100 之间的百分比值，指定将该区域看作边缘所需的像素对比度。此值越高，图像的对比度越低。</p>
</li>
<li><p>为“频率”输入介于 0 到 100 之间的值，指定钢笔设置锚点的密度。此值越高，路径锚点的密度越大。</p>
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<li><p>如果使用的是光笔绘图板，请选择或取消选择“钢笔压力”。当选择该选项时，钢笔压力的增加将导致宽度减小。</p>
</li>
</ul>
</li>
<li class="stepexpand"><span>在图像中单击，设置第一个紧固点。</span></li>
<li class="stepexpand"><span>要手绘路径段，请移动指针或沿要描的边拖动。</span> <p>刚绘制的边框段保持为现用状态。当移动指针时，现用段会与图像中对比度最强烈的边缘对齐，并使指针与上一个紧固点连接。磁性钢笔定期向边框添加紧固点，以固定前面的各段。</p>
<div class="fignone"><img alt="" id="dr_08" src="images/dr_08.png" /><div class="figdesc">单击可添加紧固点并继续跟踪。</div><br /></div></li>
<li class="stepexpand"><span>如果边框没有与所需的边缘对齐，则单击一次以手动添加一个紧固点，并使边框保持不动。继续沿边缘操作，根据需要添加紧固点。如果出现错误，按 Delete 键删除上一个紧固点。</span></li>
<li class="stepexpand"><span>要动态修改磁性钢笔的属性，请执行下列操作之一：</span><ul><li><p>按住 Alt 键 (Windows) 或 Option 键 (Mac OS) 并拖动，可绘制手绘路径。</p>
</li>
<li><p>按住 Alt 键 (Windows) 或 Option 键 (Mac OS) 并单击，可绘制直线段。</p>
</li>
<li><p>按左方括号键 ([) 可将磁性钢笔的宽度减小 1 个像素；按右方括号键 (]) 可将钢笔宽度增加 1 个像素。 </p>
</li>
</ul>
</li>
<li class="stepexpand"><span>完成路径：</span><ul><li><p>按 Enter 键 (Windows) 或 Return 键 (Mac OS)，结束开放路径。</p>
</li>
<li><p>双击，闭合包含磁性段的路径。</p>
</li>
<li><p>按住 Alt 键 (Windows) 或 Option 键 (Mac OS) 并双击，闭合包含直线段的路径。</p>
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