PS如何用通道工具细致的抠出美女头发丝？
<p><span style="color: #ff0000"><strong>最终效果:</strong></span></p><p align="center"><img alt="" src="https://img.jbzj.com/file_images/photoshop/201708/2017081411281117.jpg" /></p>
<p><span style="color: #ff0000"><strong>原图:</strong></span></p>
<p align="center"><img alt="" src="https://img.jbzj.com/file_images/photoshop/201708/2017081411281118.jpg" /></p>
<p><span style="color: #ff0000"><strong>主要过程:</strong></span></p>
<p>1、首先打开原图素材。</p>
<p align="center"><img alt="" src="https://img.jbzj.com/file_images/photoshop/201708/2017081411281119.jpg" /></p>
<p>2、进入通道面板，观察一下各通道。</p>
<p>红通道：发丝比较分明，与背景有一定的色差。</p>
<p align="center"><img alt="" src="https://img.jbzj.com/file_images/photoshop/201708/2017081411281120.jpg" /></p>
<p>绿通道：发丝不够分明，有点偏灰，右侧的发丝与背景很难分离。</p>
<p align="center"><img alt="" src="https://img.jbzj.com/file_images/photoshop/201708/2017081411281121.jpg" /></p>
<p>蓝通道：发丝与背景都是暗灰色，比好区分。</p>
<p align="center"><img alt="" src="https://img.jbzj.com/file_images/photoshop/201708/2017081411281122.jpg" /></p>
<p>3、最理想的还是红通道。选择红通道，按Ctrl + A 全选，按Ctrl + C 复制。</p>
<p align="center"><img alt="" src="https://img.jbzj.com/file_images/photoshop/201708/2017081411281223.jpg" /></p>
<p>4、回到图层面板，新建一个空白图层，按Ctrl + V 把复制的通道粘贴进来，如下图。</p>
<p align="center"><img alt="" src="https://img.jbzj.com/file_images/photoshop/201708/2017081411281224.jpg" /></p>
<p>5、现在我们来把发丝调亮，背景压暗。点击图层面板下面的创建新的填充或调整图层按钮，然后选择色阶。</p>
<p align="center"><img alt="" src="https://img.jbzj.com/file_images/photoshop/201708/2017081411281225.jpg" /></p>
<p>6、增加RGB通道明暗对比，参数及效果如下图。</p>
<p align="center"><img alt="" src="https://img.jbzj.com/file_images/photoshop/201708/2017081411281226.jpg" /></p>
<p align="center"><img alt="" src="https://img.jbzj.com/file_images/photoshop/201708/2017081411281227.jpg" /></p>
<p>
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