Blender Green Screen

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Using Blender 2.8 it is possible to create a “green screen” video. Essentially you record a video in front of a green screen then superimpose that video over another background. To do this in Blender is fairly simple but you have to know what you are doing. It’s certainly not intuitive.

  1. Blender Green Screen Removal
  2. Blender Green Screen Tutorials

This picture shows the compositor window it’s important to understand that Blender has many different work benches in which you can manipulate “things” The compositor window allows us to take the source and apply nodes making it possible to filter out the green screen. This blog is just showing the very basic process of making a green screen video. It’s not intended to be perfect and much of the “tweaking” will depend on the final video used.

Here you can see three work benches are open the video editing, the rendering, and the compositing. You can switch between these work benches but for now it’s only necessary to use the compositing work bench. If the compositing work bench is not open, click on the + to the right and select compositing.

  • Blender Stack Exchange is a question and answer site for people who use Blender to create 3D graphics, animations, or games. How can I make the green screen.
  • In this Green-screen Compositing course, we take a look at how you can apply this technique by making actors appear as if they were inside a 3D Blender environment Get Started or Watch Video Trailer Blockbuster movies, video games and news reports wouldn’t be the same today without the use of green-screen.

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When you check the use nodes box (see previous picture) you will be presented with a rendering node and a composite node. You can delete the rendering node as we are not working a rendering as our source. To delete it, right click on the rendering node and select delete. Instead we are working with our green screen movie. Click add then input from the menu and insert a Movie Clip node. To place the node just move the mouse and left click in the position you want it to stay. It doesn’t really matter where you put it but input is usually left to right. At the bottom of the node you can see a file search box. Click that and select your green screen video. Of course at this point the green screen video is just something in front of a green screen that you can see, no magic has been applied.
Now add a keying node. You can find that under the Matte menu item. You will see that the keying node will allow you to select many different adjustment factors. More on this later.
Now connect the image output of the green screen movie clip node to the image input of the keying node. Don’t adjust anything yet, there are more nodes to add that will make the adjustment easier.Now add an Alpha Over node, you will find it under the color menu. Connect the image output of the keying node to lower image input of the Alpha Over node. You will see why later.
Finally add viewer node now connect the image out from the alpha over to the image input of both the composite node and the viewer node. This will show you the green screen picture in the background. You can adjust this image to make the green screen disappear. To start you will need to go back to the keying node.

Here you can see an item called Key Color. Click on the color and choose the color picker (pipet) and select a darker portion of the green screen in the video image. This will set the key color so that Blender will try to remove it. Now you can tweak all the settings in the keying node to try and make the green screen disappear. – You should wait for the change to render before you try another tweak. Eventually you may add other nodes to assist with removing the green screen but for now, let’s keep it very simple. Once you have the green screen removed (in my example it’s not quite gone but I don’t want to be perfect here just get the principle worked out.Now we can add a second movie clip node, this will be our background. It can be a static image or another video. The choice is yours. Once you have added the node use the file selector to insert the media you want to use. Make sure that it is large enough to fill the background. If it is not adjust it before you use it.

Once you have the media loaded in the second movie clip node just connect the output of that movie clip node directly to the upper image input of the Alpha Over node. This should put your image in the background.Before you render the video you need to make sure you have everything set up properly. The output should look like the picture above. Select an output folder and ensure you have ffmpeg video selected or it will just render frames. Select RGB for color output and an MPEG4 container. Make sure your end Frame is the end of the video you want, too short and you won’t get it all, too long and you will have a lot of black. And finally, and most importantly. Blender will by default render the sequencer (video editing work bench) you need to select just compositing in the post processing. Then just render the animation. I normally render the image first just to make sure it’s rendering what you want to see. Rendering takes a while, go get a drink and come back later and you should have a video in the output folder that you selected. You can take that video into the video editing work bench and manipulate it like any other video.

NOTES:

If you want to use a box matte to remove areas of the video that are not on the green screen. Ensure you connect to the garbage input on the keying node. The box matte node should connect right after the movie clip node and before the keying node.

Hollywood studios use green screen to create all kinds of incredible special effects. Your local weatherperson uses it to look like they’re standing in front of a cool weather map.

But you don’t have to be a big-shot movie director or even a local TV station to enjoy the many benefits green screen (or, as it’s technically called — chroma key) offers.

In fact, all you need to make a professional-quality green screen video is a smartphone or webcam, some fabric, good video editing software, and a little know-how.

But we’re getting ahead of ourselves here. Before we get started on the how, let’s talk about the what and why.

What exactly is a green screen, and why would you ever want to use a green screen effect in your video?

What is green screen?

Using green screen in video replaces the background of a video with a digital or virtual background. It offers the most natural-looking way to integrate your subject into your video.

Instead of putting each visual element in its own frame (a la picture-in-picture), green screen lets you blend them. In fact, done correctly, you would never suspect they were two separate video streams.

In the most technical terms, green screen, blue screen, chroma key, chroma key compositing all refer to the same idea. Regardless of what you call it, it’s a post-production technique for compositing (layering) two images or video streams together based on color hues (chroma range).

Blender Green Screen Removal

In layperson’s terms, it’s superimposing one image or video stream over another so it looks like one image or stream.

Newscasting, motion picture, and video game industries love this technique, but anyone can use the green screen effect.

Given the current working conditions of most people during the global pandemic, it’s a safe bet you’ve had a Zoom meeting or two with coworkers or others who’ve had cool virtual backgrounds. Green screen is really the same concept, but will typically provide a more professional result.

Green screen has come a long way since Lawrence Butler won an academy award for his special effects in the 1940 film The Thief of Bagdad.

Back then, the process was quite complex. Adding green screen required a lot of time and highly specialized equipment.

Blender Green Screen Tutorials

Now, you can easily do it in the comfort of your own home with minimal equipment and technical skills.

Make professional-quality videos — no pro skills required!

Download a free trial of Camtasia and see how easy it can be to create amazing videos.

Why use green screen?

As noted above, you’ve likely seen a meteorologist use a green screen to report the weather. Meteorologists stand in front of the green screen point out specific parts of the forecast. But the green screen does more than provide clarity. It also allows them to personalize their broadcast and connect to their viewers.

Although you may not be detailing cold fronts from your desk, I’d bet you still have opportunities to connect with an audience at work. A green screen is a great option for adding a personal touch to lots of different types of videos.

Consider using it the next time you need to:

Chroma key (remember, that’s green screen’s “technical name”) is a big deal for anyone who needs to connect with viewers. When done well, a green screen can give your video a professional aesthetic on the cheap.Create an online training video by superimposing yourself over all or just part of the lesson. This is an instant upgrade over talking through a PowerPoint presentation — and it’s way more impressive than just doing picture-in-picture with your webcam.

Whether you want to make it look like you (or your video subject) is on the moon or an African safari — or you just want to obscure the drab or uninspiring walls of your office or home studio, green screen makes it easy.

And, you don’t need to build a fancy set or rent studio time. You can shoot your video anywhere and replace the background with a branded graphic, stock photo, or video element.

In fact, TechSmith Assets for Camtasia offers a huge library of potential backgrounds you can use!

How to create your own green screen background

To pull off this technique, all you need is a few things: A green or blue piece of cloth/fabric, a camera, lights, and some video editing software.

Step 1: Get a backdrop

First, get a piece of muslin cloth that’s a bright shade of green.

Avoid a color that matches your skin tone so you don’t blend into your background.

Blue screen backdrops are also available, but they can cause problems if the person on camera has blue eyes or clothes. If you don’t want to mess around with hanging a cloth, a collapsible green screen panel is a nice option.

This example from Amazon includes both a green and blue collapsible screen.

Since it’s not too big (5′ x 7′), it’s perfect for when you need to travel for a shoot. We’ll discuss shadows and more when we get into lighting. But for now, remember to stand as close to the backdrop as you can without casting a shadow on it. This is usually around two or three feet. Also, make sure to keep your hands close to your body. Any part of your arm or hand that extends past the backdrop will look cut off in your final video.

Step 2: Pick your camera

Next, you’ll want to pick a camera or webcam that shoots HD quality video (720p or higher) at a decent frame rate (24 fps or above). Make sure your camera saves out files in a format your green screen software can import. We’ve had good success using an iPhone, but most any digital camcorder will work.

No matter what camera you choose, Camtasia makes it easy to import your video and make your edits.

When you’re just starting out, recording footage on your smartphone might seem daunting. We’ve put together some tips and advice for shooting videos on your mobile device. We cover everything you need to know about audio, shot composition, and lighting.

Step 3: Set up your lighting

The next step is optional but recommended. It may take a little trial and error to get it right, but you’ll love the results.

Shadows can be the enemy of great green screen video, so you want to be sure your background is as well-lit as possible. Use a flat green background. The flatter the green, the easier it will be to remove the screen.

Don’t worry too much about getting a perfectly lit set, though. The Remove a Color effect in Camtasia is quite forgiving of background shadows. Spend a few minutes tweaking the settings and you should be good.

More advanced lighting for green screen

If you’re having trouble getting the background to disappear or there’s a slight halo around the person, try to upgrade your lighting. The more even your lighting, the better the effect will be.

The easiest thing to try is a couple of hardware store clamp-on work lights with high-output LED bulbs. You’ll also need something to clamp them on. Aim the lights so that the green screen doesn’t have dark areas or bright areas. Focus your efforts on the area directly behind the person you’re shooting. You’ll be able to crop out the excess space later.

To throw a lot of light, you need a few bulbs in each fixture. You could build your own video lighting rig for less than $100 (see video below). Or if you’re not into DIY projects, you can shop around for a video softbox. CowboyStudio is a good place to start. Look for “continuous lighting” as opposed to flash or strobe lighting.

Whether you buy or build, it’s best to use a diffusion filter for each light. That will help keep your lights from throwing shadows.

This quick video shows you how to build your own lighting kit on the cheap.

(You can also get a few tips of the trade for making your subjects look more natural.)

Not seeing the video? Watch it on YouTube…

Step 4: Get the right software

In the Camtasia video editor, you can remove your green screen with just a few clicks. In fact, Camtasia 2020 makes it easier than ever to create professional-quality videos — no pro skills required.

From easy-to-use and share video templates and themes to a wide variety of assets and resources to help you on your way, Camtasia 2020 takes the guesswork out of video creation and puts you and your team at ease.

Blender Green Screen

Anyone can make a green screen video

Green screen video may seem intimidating and difficult, but with the right tools and a few tips and tricks, anyone can master this useful technique. Whether you’re making videos for 5 or 5,000 people, they’ll be amazed at the professional quality and engaging experience green screen provides.

Make professional-quality videos — no pro skills required!

Download a free trial of Camtasia and see how easy it can be to create amazing videos.

Editor’s Note: This post was originally published in May 2012 and has been updated for accuracy and comprehensiveness.

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