'color keying'这个词语来源于英语，翻译成中文是“颜色键控”，是一种图像处理技术，用于从一幅图像中去除某个颜色并将其替换为另一幅图像或纯色背景。
以下是9个英语例句：
1. Color keying is commonly used in video production to place actors or objects in different backgrounds.（颜色键控在视频制作中常用于将演员或物体置于不同的背景中。）
2. The green screen technique is a type of color keying used in film and television production.（绿幕技术是电影和电视制作中使用的一种颜色键控技术。）
3. Color keying can be difficult to achieve with certain shades of blue or green, as they can be similar to skin tones.（对于某些蓝色或绿色的阴影，颜色键控可能难以实现，因为它们可能与肤色相似。）
4. The software has a built-in color keying tool that allows you to easily remove unwanted backgrounds from your images.（该软件内置颜色键控工具，可让您轻松地从图像中删除不需要的背景。）
5. Color keying is often used in video games to create realistic and dynamic game environments.（颜色键控通常用于电子游戏中，以创建逼真而动态的游戏环境。）
6. The color keying process involves isolating a particular color range and replacing it with another image or background.（颜色键控过程涉及隔离特定的颜色范围，并用另一幅图像或背景替换它。）
7. Color keying can be used to create special effects in movies or TV shows, such as making a character appear transparent or invisible.（颜色键控可用于电影或电视节目中创建特殊效果，如使角色呈透明或隐形状态。）
8. Advanced color keying techniques can be used to create complex visual effects, such as morphing or motion tracking.（高级颜色键控技术可用于创建复杂的视觉效果，如形态变换或运动跟踪。）
9. Color keying is an essential tool for video editors and post-production professionals who need to create seamless composites from multiple sources.（颜色键控是视频编辑和后期制作专业人士必备的工具，他们需要从多个来源创建无缝复合物。）
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