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  • Overview
  • Transcript

3.2 Lens Distortion Removal

You will learn how to remove fish-eye lens distortion commonly associated with aerial footage.

1.Introduction
1 lesson, 01:28

1.1
Introduction
01:28

2.Preparation
2 lessons, 10:13

2.1
Camera Settings
05:49

2.2
UAV Preparations
04:24

3.Optical Fixes
2 lessons, 13:45

3.1
Reducing 'Jello' Effects in Post
08:28

3.2
Lens Distortion Removal
05:17

4.Color Correcting Aerial Footage
1 lesson, 07:04

4.1
Basic Color Correction
07:04

5.Footage Speed
4 lessons, 18:19

5.1
Slow Motion
02:23

5.2
Speed Ramping
08:32

5.3
Faux Slow Motion
03:48

5.4
Adding Motion Blur
03:36

6.Stabilization
1 lesson, 10:41

6.1
Stabilizing a Shot
10:41

7.Zooming in Post
1 lesson, 04:45

7.1
How to add a Faux Zoom to a Shot
04:45

8.Color Grading Aerial Footage
1 lesson, 11:26

8.1
Color Grading
11:26

9.3D Camera Tracking Aerial Footage
1 lesson, 07:43

9.1
3D Camera Tracking
07:43

10.Conclusion
1 lesson, 00:59

10.1
Conclusion
00:59


3.2 Lens Distortion Removal

All right, in this lesson we're gonna look at lens distortion removal. This is commonly associated with GoPro cameras where you have a really wide screen, almost fish-eye looking footage. It kind of distorts around the edges so we're gonna look at how we can remove that. In this lesson I'm gonna be using example clip 2 as included with the project files. So I'm gonna click on that clip and just drag it down here to create a new composition. This clip is also 4k, so I'm gonna right click, go to Composition Settings. I'm gonna change this to 1920x1080, and I'm gonna name the composition GoPro Fix and I'm gonna click OK. Right now we can see our footage is much bigger than our composition so I'm gonna select the footage. I'm gonna go up here to Layer > Transform > Fit to Comp Height. All right, so that's gonna scale our footage down to fit perfectly in the 1080p composition. I'm gonna close this tracker window here just so we can have a little bit more room. And here's a very common example of the distortion that a GoPro gives the footage. So this is just an aerial clip flying forward over some scenic terrain. And we can see how the fish eye basically gives the earth kind of a round appearance and this distortion effect can be very distracting if it's not an action style video. And what we really want is for our footage to look more cinematic. Luckily for us this is a really easy fix. I'm gonna go up here to Effect. I'm gonna go to Distort and the Effect Optics Compensation. Before I dive into the settings of this effect, I want to explain a little bit of what it's gonna be doing and why it's better to always use a 4k shot when using this effect. It's effectively gonna be stretching and scaling the pixels around the edges to basically remove this lens distortion. But since we're working with a 4k shot that's not precomposed, it should scale down to this 1080p composition, we've effectively got more pixel density to work with. So we're gonna get a higher quality result because we're using a 4k shot. The first option we have here is Field of View, and I'll just pull this up a little bit so we can see what this is doing. And right off the bat you're gonna notice that this is not working the way we need it to work. And you're gonna wanna check on this check box here, Reverse Lens Distortion. Now we can see what this effect is doing a lot more. So if I pull this up here. The higher I pull it, you can see the horizon line starts to level out, and that's what we want. We basically want this to be perfectly level. And I recommend anywhere between 70 and 75 is what I found for a GoPro that tends to work the best when shooting in the wide lens angle. So I'm just gonna type in 75 here and I think that looks pretty good here. We can see the horizon looks pretty level, we're not getting very much distortion. I'm going to check the effect on and off here just so you can see what's happening around the edges. You can see how it's basically pulling the pixels to straighten everything out. Now one thing you might notice is the horizon looks straight, but it's not quite level and this is very common with aerial footage. It's a very easy fix as well. A lot of times the gimble will get off by a degree or two, so everything is effectively rotated about one degree. So what we can do here, I'm gonna click on the clip. You can hit R on the keyboard, bring up Rotation. Basically I can rotate this, I think about negative one degree there. That's looking a lot straighter. You can check this by clicking on the rulers, and if you click up here you can pull down on this little red bar and that's gonna show you basically a level line. So we can just kinda preview that. That horizon looks pretty level there. I'm gonna go ahead and get rid of the rulers and the guides, that way we can just see this a little clearer. Close the info box here. Now another thing you'll notice here is we now have these black in the top corners and kind of around the edges. It's because we rotate it. So we need to scale this up just a touch. So I'm gonna hit S on the keyboard while I have the clip selected. And instead of having it 50% I'm gonna set it at 52%. And there we go. It's just enough so we're not getting anything cut off here. And our terrain looks perfectly level. And now our shot, the lens distortion is gone. So this already looks really good and it's gonna be a lot more cinematic. And one thing this does do is it kinda crops in on the shot. So if we want to get the entire wide angle of the shot without having the lens distortion we can check this checkbox over here which is Optimize Pixels. Now we can see we have a much wider shot all the way through from each side of the frame. Looks a lot closer to our original shot here. I'm just gonna turn the effect on and off just so you can see this. So now we're really seeing the full width of the shot, and everything's just been straightened up and now notice we have these black areas at the top and the bottom. That's because it's basically binning the image but now we have these areas at the top and bottom that need to be filled in. And the easiest way to get rid of this is just to add some aspect ratio bars at the top and bottom of the footage, like a 2,35 aspect ratio. I've included a 2,35 image overlay in the project files and I'm gonna grab that and overlay that now. So I'll just grab this aspect ratio overlay, put it over my footage here, and it's formatted for a 1080p composition. Now you can see this covers up the top and the bottom, bringing a very widescreen appearance on our shot. We can scroll through here, let's drag this down so we can see. I'll do a quick ran preview of this just so we can see what it looks like. All right, so now we can see the shot has the lens distortion completely removed, looks much more cinematic. We can get a very wide angle shot, but again we don't have that distortion. I'm gonna show you what this looks like again, before and after the effect here. There's after, and there's before. We can't even see the top horizon line here because of our aspect ratio markers. And that just shows you how distorted the shot actually was, and what we can bring it back to after we do the lens distortion removal. In the next lesson, we're gonna leave you some basic color correction techniques for aerial footage.

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