PS巧用通道抠出多发丝的美女头像并更换背景色教程
<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/201705/2017052413162344.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/201705/2017052413162345.jpg" /></p>
<p><span style="color: #ff0000"><strong>主要过程：</strong></span></p>
<p>1、打开素材图片大图，进入通道面板，观察一下各通道，左侧发丝以深灰色为主，右侧发丝以灰白色为主。</p>
<p align="center"><img alt="" src="https://img.jbzj.com/file_images/photoshop/201705/2017052413162346.jpg" /></p>
<p>2、先来抠取左侧的发丝。选择绿通道，按Ctrl + A 全选，按Ctrl + C 复制。</p>
<p align="center"><img alt="" src="https://img.jbzj.com/file_images/photoshop/201705/2017052413162347.jpg" /></p>
<p>3、点RGB通道返回图层面板，新建一个图层，按Ctrl + V 粘贴，如下图。</p>
<p align="center"><img alt="" src="https://img.jbzj.com/file_images/photoshop/201705/2017052413162448.jpg" /></p>
<p>4、新建一个图层，用套索工具把左侧头发以外的区域勾出选区，并填充白色，如下图。</p>
<p align="center"><img alt="" src="https://img.jbzj.com/file_images/photoshop/201705/2017052413162449.jpg" /></p>
<p>5、创建色阶调整图层，增加高光区域亮度，参数及效果如下图。</p>
<p align="center"><img alt="" src="https://img.jbzj.com/file_images/photoshop/201705/2017052413162450.jpg" /></p>
<p align="center"><img alt="" src="https://img.jbzj.com/file_images/photoshop/201705/2017052413162451.jpg" /></p>
<p>6、底部发丝背景还有一些灰色，用套索工具选取出来，并把选区羽化15个像素。</p>
<p align="center"><img alt="" src="https://img.jbzj.com/file_images/photoshop/201705/2017052413162452.jpg" /></p>
<p>7、创建色阶调整图层，增加明暗对比，参数及效果如下图。</p>
<p align="center"><img alt="" src="https://img.jbzj.com/file_images/photoshop/201705/2017052413162553.jpg" /></p>
<p align="center"><img alt="" src="https://img.jbzj.com/file_images/photoshop/201705/2017052413162554.jpg" /></p>
<p>8、同样的方法用套索工具选区下图所示的区域，羽化10个像素后创建色阶调整图层，把残留的背景调白，如下图。</p>
<p align="center"><img alt="" src="https://img.jbzj.com/file_images/photoshop/201705/2017052413162555.jpg" /></p>
<p align="center"><img alt="" src="https://img.jbzj.com/file_images/photoshop/201705/2017052413162556.jpg" /></p>
<p>9、创建反相调整图层，把发丝转为白色，同时把背景转为黑色，效果如下图。</p>
<p align="center"><img alt="" src="https://img.jbzj.com/file_images/photoshop/201705/2017052413162657.jpg" /></p>
<p align="center"><img alt="" src="https://img.jbzj.com/file_images/photoshop/201705/2017052413162658.jpg" /></p>
<p>
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