Learning the fundamentals behind pulling a Green screen key is very important, but it can be hard to know where to start.

学习背后的基本原理拉一个绿色的屏幕键是非常重要的，但它可以很难知道从哪里开始。

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When you're finished with this course, you'll not only have a completed green screen composite, but you'll also have the knowledge and skills needed to key any basic green screen image in the future.

当你完成这门课程，你不仅有一个完整的绿色屏幕复合材料，但你也有知识和技能，关键的任何基本的绿色屏幕图像在未来。

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Today's fashion for green screen and chroma key is not so far removed from the back projection and studio sets of Hollywood's Golden Age.

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"It's normal television technology - chroma key, " he said referring to the green-screen backgrounds used to superimpose people against separately filmed scenes.

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But key will be whether Snyder can match "Watchmen's" dramatic beats against its green-screen chicanery for more than two hours (the Internet Movie Database lists the running time at 163 minutes).

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