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dm8168 DVR_RDK4.0 使用OSD叠加图片透明化处理其中某个颜色值



将一张带有绿色背景的图片叠加在输入的视频中时,使用SWOSD将绿色部分的颜色透明处理,但是图片中见人物周围人有绿边,是什么原因造成的,改如何处理? OSD图片和效果图如下: