在本指南中，我将解释如何以极快的速度从视频中移除绿屏。一旦您安装了我将建议的软件，整个过程只需几秒钟。
请按照以下步骤了解这一切是如何完成的。我还将解释如何将自己的背景添加到视频中，或选择添加其他效果。
如果您有可靠的互联网连接(internet connection)来安装软件，整个过程应该不到一个小时。
入门 - 安装免费的视频编辑软件
首先，您必须安装视频编辑软件。对于本指南，我将建议Hitfilm Express。你可以从他们的网站免费下载。
整个软件都是免费的，只要你在Facebook 或 Twitter(Facebook or Twitter)上分享给他们。您可以在软件下载后删除您的共享。软件下载完成后，就可以开始了。点击左上角的文件，然后点击(File )新建(New)。
您可以选择默认值，即 1080p Full HD @ 60 fps。选择它们后，单击OK。如果您的视频有其他尺寸，请不要担心，添加视频后会自动应用正确的尺寸。
完成上述步骤后，您将进入编辑器。您现在唯一需要注意的部分是底部的媒体和编辑器选项卡。(editor tabs)媒体选项卡是您需要放置带绿屏的导入视频的位置。编辑器选项卡(editor tab)用作时间线，您可以将导入的媒体拖入其中。
那么，让我们开始吧。将您的绿屏视频拖到Hitfilm Express的媒体选项卡中。(media tab )这样做很简单：在您的 PC 上找到您的绿屏视频，然后单击并将其拖到媒体选项卡中。
接下来，将绿屏视频(screen video)从媒体选项卡拖到 Hitfilm Express的(Hitfilm Express)编辑器选项卡(editor tab)中
。您将在时间线中看到剪辑的轮廓。放开鼠标按钮(mouse button)，视频将被放置到您的时间轴中。如果您的视频分辨率不同，则会出现一个弹出窗口，您可以在此处单击“确定(OK)” 。
接下来，单击左下方窗口中的“效果”选项卡。(Effects )在这个新窗口的搜索栏中(search bar)，搜索Color Difference Key。接下来，将色差(color difference)键文本拖到编辑器时间线中的视频剪辑(video clip)上。
绿屏将被删除。通常，只要您使用的视频具有良好的照明条件，最终效果就会很好(end result)
移除绿屏后，就该添加背景视频(background video)了。如果你不需要背景，你可以跳过这一步。
如何为绿屏视频添加(Screen Video)新背景(New Background)
首先，你需要有一个合适的背景。它可以是视频或图片。理想情况下，它需要与原始绿屏视频(screen video)具有相同的分辨率才能获得最佳效果。
一旦你有了合适的背景，在你的电脑上找到它的文件，然后把它拖到Hitfilm Express上的媒体选项卡(media tab )中，就像你之前对绿
屏视频(screen video)所做的那样。
接下来，了解时间线的工作原理很重要。当您在另一个之上添加新剪辑或图像(clip or image)时，它会出现在最终视频中的顶部。您需要将背景移到绿屏视频(screen video)下方。
为此，首先
从编辑器时间线中单击并拖动绿(editor timeline)屏视频(screen video)，然后将其放入视频 2 插槽(video 2 slot)中。
随着您的绿屏视频现在占据
视频 2(video 2)，您可以单击并将背景媒体拖到编辑器时间线中的视频 1 插槽中。(video 1 slot )
一旦它在视频 1(video 1)中，您可以使用右上角的播放工具来测试结果。正如您从我们的示例视频中看到的那样，我们设法让我们的绿屏视频(screen video)出现在背景上方。
您可以返回编辑器时间线并按C选择切片工具(slice tool)。这将允许您剪切任何多余的背景素材。选择切片工具后，将鼠标悬停在绿屏视频(screen video)的边缘，然后单击以将其剪切。
剪切完多余的素材后，您可以按V选择选择工具(selection tool)。现在，单击剪辑右侧的多余素材。您现在可以按Delete将其删除。
通过导出完成您的绿屏视频(Green Screen Video)
一旦您对结果感到满意，您就可以将其导出。现在，它只是一个Hitfilm 项目(Hitfilm project)文件。要导出您的视频，请单击(Click) 屏幕右侧编辑器选项卡上方的(editor tab)导出(Export )。之后，单击Contents。
这样做会将您带到导出屏幕(export screen)。单击(Click) 屏幕底部的开始导出。(Start Exporting)您的视频现在将导出。所需时间取决于视频的长度以及处理器的功能。完成后，您会听到熟悉的Windows 警报(Windows alert)噪音。任务栏中的Hitfilm 图标(Hitfilm icon)也会发出橙色光。
您可以再次打开Hitfilm，然后单击“输出”字段(Output fieldto)中的链接以在您的计算机上找到该文件。
概括
如果您已经阅读到这里，您现在应该知道如何从视频中删除绿屏以及如何使用免费软件添加背景。如果您对本指南有任何疑问，请在下方留言，我会尽快回复您。
How to Remove a Green Screen From a Video Quickly and For Free
In this guide, I will explain how you can
remove a green screen from a video incredibly quickly. The whole process takes
just a few seconds once you have installed the software that I’m going to
suggest.
Follow the steps below to learn how it’s all
done. I will also explain how you can add your own background to the video, or
choose to add other effects.
The whole process should take less than an
hour if you have a reliable internet connection to install the software.
Getting Started – Installing Free
Video Editing Software
To start with, you must install a video editing software. For this guide, I’m going to suggest Hitfilm Express. You can download it from their website for free.
The entire software is free, so long as you give them a share on Facebook or Twitter. You can delete your share after the software has downloaded. Once the software has downloaded, it’s time to get started. Click File in the top left, then click New.
You can select the defaults, which should be
1080p Full HD @ 60 fps. Once they are selected, click OK. If your video has other dimensions, don’t worry, the right
dimensions can be applied automatically once the video is added.
Once you’ve followed the steps above, you’ll
be in the editor. The only parts you need to pay attention to for now are the
media and editor tabs at the bottom. The media tab is where you need to place
your imported video with the green screen. The editor tab works as a timeline
and you can drag imported media into it.
So, let’s begin. Drag your green screen video
into the media tab on Hitfilm
Express. Doing this is simple: find your green screen video on your PC, then
click and drag it into the media tab.
Next, drag the green screen video from the
media tab into the editor tab within
Hitfilm Express. You’ll see the outline of the clip in the timeline. Let go of
the mouse button and the video will be placed into your timeline. If the
resolution of your video is different, a pop-up will appear, you can click OK here.
Next, click the Effects tab in the bottom left window. In the search bar of this new window, search for Color Difference Key. Next, drag the color difference key text onto your video clip in the editor timeline.
The green screen will be removed. Generally,
the end result will be good so long as the video you have used has good
lighting conditions
After you’ve removed the green screen, it’s
time to add a background video. If you don’t need a background, you can skip
this step.
How to Add a New Background to a Green Screen Video
First, you need to have a suitable background.
It can be a video or a picture. Ideally, it needs to be the same resolution as
your original green screen video for the best results.
Once you have a suitable background, find the
file for it on your PC and drag it into the media tab on Hitfilm Express, just like you did with the green
screen video earlier.
Next, it’s important to understand how the
timeline works. When you add a new clip or image on top of another, it appears
over the top of it in the final video. You will need to move the background
underneath the green screen video.
To do this, first click and drag the green
screen video from within the editor timeline and bring it into the video 2 slot.
With your green screen video now occupying
video 2, you can click and drag your background media into the video 1 slot in the editor timeline.
Once it is in video 1, you can use the playback
tools in the top right to test the results. As you can see from our example
video, we managed to get the our green screen video to appear above the
background.
You can go back to the editor timeline and
press C to select the slice tool.
This will allow you to cut any excess footage of the background. With the slice
tool selected, hover over the edge of the green screen video and then click to
cut it.
Once the excess footage has been cut, you can press V to select the selection tool. Now, click on the excess footage on the right side of your cut. You can now press Delete to remove it.
Finalize Your Green Screen Video by Exporting
Once you’re happy with the results, you can export it. Right now, it’s only a Hitfilm project file. To export your video, Click Export on the right side of the screen, just above the editor tab. After, click Contents.
Doing this will take you to the export screen. Click Start Exporting at the bottom of the screen. Your video will now export. The time it takes will depend on how long the video is and how powerful your processor is. Once it is done, you’ll hear the familiar Windows alert noise. The Hitfilm icon in the taskbar will also glow orange.
You can open Hitfilm again and click on the
link in the Output fieldto find the
file on your computer.
Summary
If you’ve read this far, you should now know
how to remove a green screen from a video and how to add a background with free
software. If you have any questions about this guide, please leave a comment
below and I’ll reply to you when I can.
