很多朋友在学会了钢笔抠图后,提出了一个问题,遇到了飘逸的秀发如何抠?我将自己用通道法抠图的方法介绍给喜欢PS的朋友们,通道法抠秀发比较好,抠其它地方还是钢笔工具好,我结合钢笔和通道抠图的方法,进行图解说明,有不周到的地方,请朋友们谅解。 通道扣图原理:通道有:颜色通道、ALPHA通道、和专色通道。其中ALPHA通道是用来存储选区的,ALPHA 通道是用黑到白中间的8位灰度将选取保存。相反我们可以用ALPHA通道中的黑白对比来制作我们所需要的选区。(ALPHA通道中白色是选择区域)色阶可以同过调整图象的暗调、中间调和高光调的强地级别,校正图象的色调范围和色彩平衡。我们可以通过色阶来加大图象的黑白对比,用此来完成。 
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