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I always find that before I use a tool or control that it's helpful to deconstruct that tool or control in order to really understand what's happening. That's what we're going to do here. We're going to focus in on the Lens Corrections panel, and I want to deconstruct how Lens Vignetting as well as Chromatic Aberration Corrections actually work. Here we're going to focus in on Lens Vignetting. Now, you notice that we have two controls: Amount and Midpoint. What's interesting is that we can use these controls to either enhance our photographs or to make corrections.
One of the things that we could do would be to darken the edges of our photograph. We could do that by clicking on the slider and dragging to the left or dragging towards the darker over here. You'll notice that's it's lighter on the right-hand side. So when we add a negative amount, here we have this darkening effect showing up around the perimeter of the photograph. Now, if we want that effect to extend further into the frame, simply click and drag the Midpoint to the left. If we want to limit it to the outer edge or those outer corners, click and drag to the right.
Now to reset any of these controls, simply double-click the Triangle icons. All right! Well, now that we know about the darkening side of things, what about the brightening? Well, if we click and drag to the right, here you can see we can brighten the outer edges. This can be used to add a little bit of a correction to your photographs, which happens when sometimes using wide-angle lenses. You make it a vignette or a darker vignette around the edges. We could then compensate for that by brightening those edges. Let's crank this all the way up. How then does a Midpoint work here? Well, it's kind of interesting, because it's a little bit different.
If I go ahead and drag this to the right, you can see that this again is now limiting this to the corners, in the same way as it worked previously. Click and drag this to the left, and it's allowing that brightening effect to moving closer to the center of the image. Well, now that we've taken a look at Lens Vignetting, what about Chromatic Aberration and Defringing? I want to go ahead and click on this demo file, and then I'll double-click the Zoom tool to zoom in on it. Press the Spacebar key and then click and drag to pan around the image. Now here you can see I've simply created a white box, and I've put a little color edge around this image.
I've done this to illustrate what Chromatic Aberration is. If we go ahead and zoom in on this even further, we'll see that we have this little fringe or little edge color. What can happen in certain situations is that the lens can create a distortion, which then gives you a little color fringe around areas of your photograph. Well, we can correct that by using these sliders. Now, these sliders won't work perfectly here on this demo file, but they will illustrate how if we click and drag to one way, let's say to the left here, or changing the color of that fringing, or if we click and drag to the right, we're changing that color in a different way.
What you can do is if you see Chromatic Aberration, you can click and drag this one way or another until you're able to successfully reduce or remove that fringe, as I was able to do here with the Yellow Fringe in this area. All right. Well, let's double-click those to take them back to zero. What about Defringing? Well, for that, I'm going to zoom in even closer. Defringing is actually really interesting. What it does is it allows you to actually de-saturate colors in different areas of your photograph. We can either choose Highlight Edges or All Edges.
Now, in this case, because this is a demo file, we'll just choose All Edges. What's going to happen here is you can see that it's really de-saturating that little fringe color. Sometimes, what can happen is around highlights, or around other areas of your image, you can have these weird color artifacts that show up. You can use this control in order to remove those artifacts in some pretty strong ways. All right! Well, now that we're familiar with how we can work with the Lens Corrections panel, let's go ahead and put this knowledge to use, and we'll take a look at how we can work on some images in the next few movies.
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