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阿勇pr课堂 视频教程 第七十五课 键控中的差值遮罩和移除遮罩
差值遮罩的原理是通过一个对比层与源层进行比较，然后将源层中位置和颜色，与对比层中相同的像素抠成透明，移除遮罩是调整透明和不透明边界，通过选择遮罩类型 ，减少边界白色或者黑色
Premiere 2018 基础教程75/120
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