a blue (or green) background in front of which moving subjects are filmed and which allows a separately filmed background to be added to the final image
蓝屏(影视制作中使用的一种技巧:在蓝色的背景前拍摄正在移动的物体,这样可以让另外拍摄的背景叠加到最后的图像中去)
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a blue-screen effect. 蓝屏叠加效果。