Green Screen Removal for Beginners | Sean Dykink | Skillshare

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Green Screen Removal for Beginners

teacher avatar Sean Dykink, Story is your guide

Watch this class and thousands more

Get unlimited access to every class
Taught by industry leaders & working professionals
Topics include illustration, design, photography, and more

Watch this class and thousands more

Get unlimited access to every class
Taught by industry leaders & working professionals
Topics include illustration, design, photography, and more

Lessons in This Class

    • 1.

      Your Free Gift

      0:47

    • 2.

      Class Project

      0:30

    • 3.

      Keying in After Effects

      12:54

    • 4.

      Keying in Premiere Pro

      8:22

    • 5.

      Final Thoughts

      1:07

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About This Class

We’ve all been there, you grab the eyedropper, tweak a few sliders hoping they will make your key look better... Looks good enough!? What if you actually knew what those sliders do, and could get a clean, pro-looking key every time?

In this quick class (under 30 minutes and perfect for your lunch break!), you’ll learn how to:

  • Remove green screens like a pro

  • Use Keylight in After Effects

  • Use Ultra Key in Premiere Pro

By the end of this class, you’ll know the workflow, understand the sliders, and breeze through new green screen shots with ease.

Meet Your Teacher

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Sean Dykink

Story is your guide

Top Teacher

Hi everyone, I'm Sean, a filmmaker and video editor from Canada! I've been working in a number of studio and freelance roles professionally since 2005.

My main focus in teaching is storytelling. I believe that the stories in our lives give us purpose and are the reason to learn all of this technical filmmaking stuff in the first place. We learn technical skills and storytelling craft, to effectively bring creative expression to stories that otherwise remain thoughts in our minds.

Join me in learning more about creative storytelling, filmmaking, and editing techniques. Looking forward to seeing you in class!

I post some additional tips and content on my Instagram account, check it out!

See full profile

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Transcripts

1. Your Free Gift: Come on, let's face it. We've all done this before. Use the magical color picker to remove a green screen without making any further adjustments. Nailed it. You keep telling yourself that one day you're gonna learn what all of these sliders do and get the perfect key. Today is the day because in this short class, I'm going to show you the basics of how to remove a green screen and Adobe After Effects and premiere Pro. You'll get 30 of these little handimojis to practice with. But wait, there's more. You can use these hanemojis however you like, in your own projects for personal or commercial use. Oh. After finishing this class, you'll be able to turn this into this. Yep. That is a lot of hanamojs. 2. Class Project: This class project is super simple. Pick one of the shots that you want to key, key it in after effects in Premiere Pro or both and submit that to the project page. If you really want to get fancy, add your settings. Share a tip, share what you struggled with. Share something that helped your key look better. Just focus on applying the learn techniques and the process to your chosen clip and do the best you can. It doesn't need to be perfect, like the title suggests. Let's get started by opening up Premiere Pro. 3. Keying in After Effects: Why are we opening up premiere Pro if the first lesson is about keying and after effects? Well, we're going to create a dynamic link, and we're going to get to that. But first, let's open up the video folder to class project assets. You've all these clips here that you can choose between, choose whichever one you want. You can key all of them if you want. I'm going to start with Thumbs up. I like thumbs up. It's nice and positive. Load that up into the source monitor. Nice. To create a sequence, click and drag this clip down to the new item icon. That'll automatically create a sequence that matches the clip settings. Right click on the clip. Then select replace with after effects composition. This will open up after effects and prompt you to create a new after effects project. Great. Now, I'm going to treat my file name, which will be Chroma key Thumbs up. Great. And I'll save that to my project's folder. Save, if I navigate to the project panel in After Effects, it's already created a comp with my premiere Pro project name. I don't love the name of this because it's just too much. So I'm going to delete this, hit or to rename the comp, I'll type in Thumbs up Comp. Just make it simple. We want to take out as much of the green as possible. And the way that we start this is by using what's called a garbage mat. A garbage mat is a quick, rough mask that's used to remove a large part of a key that we don't want to include it in our shot. This makes removing the green screen a bit more manageable, and it reduces the overall amount of green that we need to remove. Select the thumbs up layer, navigate up to the tools bar, select the pen tool or shortcut G. And you got to make sure that your layer is selected or you'll create a shape instead. I will frame by frame through this clip by holding controller command and using the arrow keys to frame by frame through. Until I see the thumbs up. Once I have my thumbs up here, create a rough mask by clicking, using the pen tool around the thumb. It doesn't need to be anything fancy. There, we've reduced the amount of green that we're going to eventually need to key. The mask is cutting off the shot. So what we want to do is animate the mask very roughly. It does not need to be perfect. I'll open up the thumbs up layer and locate the masks layer and open that up, as well. Under mask one, select mask path and toggle the stopwatch which toggles on animation. And it creates this keyframe, which is recording the mask that I've created at this moment in time. So if I move back by holding control or command, left arrow key frame by frame back until I see it cropped out right here, it's cropped out a bit. Select the mask. All of the points are selected. So when I click and drag it selects all those points and moves them around, I don't want that. I'll shift click this one point so I can now access that point separately. Let's move that at, too. It's a bit close. And take note that as you make more changes to this mask, new keyframes appear. When it comes to this, we have a similar shape of the thumb. So what I can do is switch to the direct selection tool, the shortcut V, click and drag Alaso over the mask. We'll select all the points at once, click and drag and move the mask so that it roughly fits the thumb. If I double click the mask and all its points, it will create this bounding box, this transform box around it, which can be helpful because in this case, I want to rotate the entire mask so that I don't have to adjust every single point. I can just make one quick rotation to cover this part of the action. I'll move through the frame once again, double click to rotate that mask. This isn't quite working. I can't shift, click on this point because we have a bounding box around our mask. To get out of this mode, I'll just hit Enter, and that will remove the bounding box. I could shift, click on that point to be able to access that point individually and manually make these adjustments. Great. Now, frame by frame through the entirety of the action to make sure that I'm not cropping anything off. Oh, and look at that. This is why we go through everything again, make sure we're not cropping anything off. Great. There are quite a few ways to key out color and after effects, but key light works the best, and it is the most professional and effective plugin available right out of the box within after effects. Navigate to the effects search menu. If you don't see that, just head over to Window effects and presets, and then type in Keylte. Click and drag the KeyltPlugI directly to the layer that you want it to effect in the comp I know there's many options when it comes to keying, so I'm going to keep it simple and show you a quick, basic, but effective way to get a good looking key. First things first, we need to select the background screen color using the screen color eyedropper. Find that green color and select the screen color eyedropper. Click the green. Wow, that looks perfect already, doesn't it? But not every situation is going to be this easy. Now, I'm going to undo that because another thing that you can do with this eyedropper is when you're selecting this eyedropper, what it does is it selects an individual pixel. But if we hold control, the eyedropper expands, and that indicates that we're selecting a group of pixels, and it's going to choose an average green color from those sample pixels. So it can, in some cases, give you a better result. Look at the view options, and we're going to mostly stick to using source, screen mat, status, and final result. Selecting source will give us a view of the original source clip. Selecting screen mat is going to show us the mat created by your screen color selection. It can kind of be challenging to see how we can improve this key using screen Mat. So that's when we want to switch over our view to status, which gives an exaggerated view of the matt and reveals problem areas. The black pixels indicate transparency, and the white pixels are opaque, meaning you can't see through them. And the gray pixels are where transparency blends. So it could be slightly opaque or slightly transparent. Clear what's going on and how we can improve this key because all of these gray pixels here indicate that it's not true transparency. So if I go back to my source mode, then I can re click a key. I'm going to hold control to expand the selection, navigate down to final result to see. Okay, that looks like a good key, but let's check out status. Okay, it's maybe a little bit better. We can improve this pretty easily. And with status, now we know what we need to focus on. Also, what I can do is use the scroll wheel on my mouse to zoom into this shot to really see what's going on. If you click and hold the scroll wheel, your mouse pointer will turn into a hand allowing you to pan your view around gray pixels in the hand, gray pixels in the arm, gray pixels in the background. And the red pixels just show what's not included in our mask. But if it was shown, those would also be problem areas that we'd have to take care of. We don't want gray pixels directly on the arm, the hand or even on the background. We want a clean key where gray pixels only show up on the edges where that transition between transparency and opaque happens. The white pixels are going to be visible, black pixels, invisible. With screen gain and balance, these are best set to their defaults. So we're going to skip those. Screen pre blur. This will blur the overall screen, which is better for noisy footage. But because our footage is pretty clean, we're not going to need this. The next step is to open up screen mat. Now, if the background is shown through the foreground, we want to increase clip white to firm it up. With Status view on, we have gray pixels on the foreground or the hand, meaning there's transparency there, so we don't want that. With clip white, we can remove the transparency on the foreground. It doesn't take much. Slowly bring that back to 97, and that already removes the gray pixels on the foreground. If I keep going, we start to get this green outline. With Status view, all these colors mean something, and green, in this case, means those are problem areas, meaning that the key isn't great, it might be eroded, it might be degraded. And if I change to final result, you can see that. Taking the clip white value down too much creates problems for that part of the key. So I'll bring it back up to 97 where we didn't have any issue, and we removed the gray pixels from the arm and the hand. That looks a lot better. We still have those leftover spots on the background, which we want to be black so it's fully transparent. Increase clip black to clean up those spots. We'll do this slowly so we don't tear into our subject. And remember, we do want those gray pixels on the edge of our mat, because that indicates the transition from opaque to transparent. Change this to final result. I'm tearing into the hairs on my arms. If you want to retain those details, we need to roll back this clip black value. Navigating back to status. So those are all the hairs, those gray pixels there. We just want to pull back this value until there is no gray pixels on the screen itself. We can still see, Oh, those are actual speckles on my monitor. I have to clean my monitor because there's dust on the monitor. So don't be fooled by your monitor dust. Let's pull this back up. Sometimes making these extreme movements will help you get rid of those gray pixels. If you're having a hard time telling what's on the background, we can toggle the transparency grid off. I do like having my transparency grid on because it gives me a better view of those darker hairs. This is looking really good. Now, next up, we're going to take care of the edges. If you do have issues with the edges, you have a thin outline. You might be able to tweak, clip black and white to improve the edges, but you might want to opt to use screen shrink slash GRE with screen shrink and grow, you can expand the edges or contract the edges. The trick here is to be subtle. It doesn't take much to remove any fringing or thin outline on your subject, but you want to be very, very subtle. I don't even need to do too much here. I don't even think I need to do this. I can do a -0.5, and that already creates a nice transition. Screen softness creates a softer transition, which, again, you want to be extremely subtle with. You do not want to overdo this, or then you create this weird halo effect around your subject. Doesn't look realistic and will be distracting. You don't need to go crazy here. Screen despot black. Honestly, I don't know how to pronounce this depot despot. I'm just going to call it screen despot black. What this does, it removes small black specks that might be inside your subject. So we do have some splots around the edges of our mat, but that is most likely hair. If you have them inside the subject, you can use screen despot to simplify the mask. So instead of having all those detailed edges and contours, it simplifies the mat. I'm going to really exaggerate this, okay? It's really simplifying that mat. No detail here. This doesn't work so great when it comes to having hairy arms. But if you have a subject like a hat or an object in the frame that might not have fine threads, this could be a good option to get a cleaner key. But for now, I'm going to keep this at zero. Screen despot white, it removes gray plotches in the background or the black areas. So if I take my clip black value down, we now have more splotches of gray. What screen despot white does, if I increase this, it removes those splotches, coagulates all those splotches together. If you can't get all of those gray splotches in the background removed, you can increase screen despot white to erase those blotches. But then again, you got to look out for those edges and oversimplifying this mat too much, losing details. Because I can get rid of this using Clip black, that's what I'm going to stick with for now. Just like that, you have a very good key. I think this looks really good. Thumbs up to us for doing that. Now all that's left to do is to hit Save. And if we tab back to Premiere Pro, we have this dynamically linked clip ready to go. Looks great. 4. Keying in Premiere Pro: Now what happens if you want to key directly in Premiere Pro? Not as effective, but you could still get a pretty good result using the internal plugins. I'll find a clip that we've keyed in after effects. Highlight the clip, then navigate to effects and type in ultra key. Ultra key is the most professional option with the best results that you're going to get within Premiere Pro. Here, I'll navigate to the Effects Controls panel to make some adjustments to our ultra key. We have our key color that we can use this color picker to select. And I can also hold control to select a larger sample size and get a pretty decent key right off the bat. We do have some vignetting here with the green because that green color is darker. To get a better view of what's going on, I can switch the output mode to Alpha channel. A Alpha channel is similar to screen mat in after effects. The white pixels are opaque. The gray pixels are semi transparent and the black pixels are fully transparent. We have a little bit of work to do here. If I change this to color channel, in this case, it's more of a diagnostic view, so it shows the luminance or the brightness of the colors you keyed from. So basically, how strong that green is in each pixel. So the brighter areas are pixels closer to the sampled screen color, and they're more likely to be removed. Darker areas are pixels further from the screen color, more likely to stay visible. So you can use this view when using the eyedropper to choose your initial key color to perhaps get a better key right off the bat. Composite is the final result. Toggle down Matt generation. Transparency, 100 is fully transparent and zero is fully opaque. That is why it's set to 45 by default because it's somewhere in between. I can move this over a little bit to remove more of the background. Subtle adjustments are going to work best here. The black background isn't doing us much favors in terms of being able to see what's going on. Navigate to the wrench and select transparency grid. Now, before I go ham on this transparency slider, let's take a look at highlight and shadow. So if I take this shadow slider and bring it up, it makes everything more opaque. Shadows. If I take it down, we're creating more transparency in the shadows of this green color here. We don't want to take them too far down because what happens then, again, using my scroll wheel to zoom into this view and clicking on the mouse wheel to pan my view. If we take too much of the shadows out, then we remove a lot of that hair on the arm. So I'll find somewhere in between. When adjusting the highlights, nothing happens because we've already created transparency within the highlights of the green. Tolerance adjusts the range of green colors that we've selected. So we have this color picked green here. Increase the tolerance, it's increasing the range of greens that are selected. So there's a lot more darker green selected, lighter green selected, and that removes quite a bit more of our matt without removing the hair. The pedestal removes a lot of this noise in the Alpha channel. We want to make sure we're not affecting a lot of those hairs. If we move this up too much, then we remove a lot of those hairs. So now, instead of having our tolerance ladder at 100, I might just take this back just a bit. See what we can do here. That looks pretty good. But here's the thing. We totally forgot to add a garbage mat to this shot. We don't need to worry too much about these edges here. We can add a mat. With the clip selected, select under the Opacity tab in the Effects Controls panel. The Pen tool, create a quick mask around the subject. Toggle on animation for the mask path. We've created a keyframe which records all of these mask points in this specific position within the timeline. Now that this animation is toggled on frame by frame through, adjust my points as necessary. I don't love working with masks in Premiere Pro. They're not nearly as easy to work with as they are in after effects. It just takes a little bit of patience, though. To select the entire mask, click and drag a bounding box over all of these mask points. You can also select a bounding box around just specific points of your mask to move those only. Have a messier mask in Premiere Pro, but it still gets the job done. If you want an enjoyable time working with masks, I highly suggest sticking to after effects, but this is how it's done in Premiere Pro. There might even be a little bit of spill here on the arm. You can see the fringing. We can deal with this using mat cleanup. I don't know if I would suggest that, but let's go through this anyway. With choke, this will shrink the mat. But what happens here is we get rid of a lot of those hairs because we've created a mat around those hairs, and those fine details are being lost when we increase choke. And with soften, it creates a better transition around these points and removes some of the green edge, but it really gets rid of too much of the fine details that we don't want to lose. Contrast creates a clear separation between your foreground and your background. It's not super helpful in this case. Matt cleanup might be better reserved for harder edged objects. And midpoint is where that transition occurs from the background and the foreground. Now that you know what it is, reserve it for harder edged objects. We do have a little bit of this green fringe on the edge of this arm here. So subtle. But we can take care of this. And we can do this by avoiding matt cleanup altogether and spill suppression and color correction in the alter key. I would prefer, instead, to use the lumitry color panel. So open up the lumitry color panel, navigate to the curves section, and find Hue versus Hue. And what this does is it allows you to select any color and change it to a different color. So we could change this green fringe to something closer to the skin tone so we hide the green fringe from our view. It's going to be really hard to use this eyedropper to select that green, and instead, select the green color. We'll create a point on this graph of two points around it. Move this point in the graph. Exaggerate this point a lot so we can see what we're affecting. It looks green, but in fact, it might not be totally green. It might be more of a yellow green. So let's see once we Oh, here we go. Now we're starting to affect the fringe, okay? So you can see that as we move this point up to blue, it changes that fringe to more of a blue hue. We're affecting that fringe now, but if we move it too far over, we start affecting the skin tones. We don't want to do that. Let's move this back just a bit. Just until we don't see those skin tones anymore being affected, it's very close. Okay. There we are. We could probably even move this handle in as well. We only want to affect the fringe. We don't want to affect the rest of the skin tones. We could take this color down to something that's closer to the skin tone instead of green. And that would be more of a red, orange too far see we could see the pink. Let's bring that down. That looks a bit better. Toggle this off and on. Green. A lot closer to skin tone. Green. Lot closer to skin tone. Very subtle, but it does make your key look a lot more professional. We got a really good, clean key quickly using the ultra key. It's a bit more quick and dirty. Working with masks informer Pro is more frustrating. If you want to take the extra step to open it up in after effects, I would highly suggest doing that. Using key light is a more enjoyable and better experience, in my opinion. But with Premiere Pro, it all stays in one place, making it easy and quick. So if you need a good enough key, stick to Premiere Pro. If you need to focus a little bit more on perfecting that key, replace your clip with an after effects composition and open it in after effects. 5. Final Thoughts: Congrats on finishing the class. I hope this has helped make keying in Premiere Pro and after effects just a little bit less scary. We didn't cover adding a background or compositing your key clip into a scene, but you're welcome to try it. You can also place the checkered Alpha PNG underneath your keyed footage if you'd like a simple background. Feel free to share your work with everyone else online. Do you have any tips or tricks you'd like to offer, feel free to include those with your class project. Please review the class. I really do appreciate the feedback. It helps me learn and grow and make better classes. Be sure to follow my profile for new class releases and occasional giveaways. And if you want to upgrade your video editing and filmmaking, I have more free video tutorials on my YouTube channel. One more thing. If you'd like to practice with Key Lite and ultra key, you'll find additional blue and green screen clips in this class as project folder. These are from my other class. Edit with confidence, step by step guide to Adobe Premiere Pro. Check it out if you're looking for a comprehensive project to build your skills in the editing process. Thanks so much for watching and remember story is your guide. I'll see you next time. And