抠婚纱（二）通道法
今天介绍在灰白背景图里抠出白色的婚纱的方法，这是个普通的常用的方法，就是大家都知道的--通道，
抠婚纱（二）通道法
。我们利用通道做选区，首先要了解通道选区的含义，在通道里，白色代表留下的部分，黑色代表舍掉的部分，灰色代表留下的半透明的部分。换句话说，就是你要留下哪部分就把它做成白色，不要的就做成黑色，透明的部分做成灰色。原图：screen.width-500)this.style.width=screen.width-500;" border=0 pop="按此在新窗口浏览图片">
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