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In Photoshop Lightroom 3 Essential Training, author Chris Orwig provides a comprehensive look at Adobe Photoshop Lightroom 3, the popular photo-asset management, enhancement, and publishing program. The course covers indispensable techniques such as importing, processing, and organizing images in the Library, correcting and adjusting images in the Develop module, and creating slideshows, web galleries, and print picture packages. In addition to exploring all of Lightroom 3's capabilities, this course is rich with creative tips and expert advice on photographic workflow. Exercise files accompany the course.
One of the things that happens occasionally when you're shooting images digitally is that you can get chromatic aberration. This typically happens when you're working with wide-angle lenses. Like with this photograph of this oak tree, if we zoom in on the image, we can do so by clicking in our Navigator panel, say to 1:1 or perhaps even further, say to something like 3:1. What we'll see is that we have this chromatic aberration where we have a color along the edge of these branches. Now again, this tends to happen on the fringes of our photographs, around those edges, and here we can see we definitely have this strange color shift.
Now this isn't limited to wide-angle capture; it happens in other scenarios as well. And you'll start to pick it up as you zoom into your photographs. Well we can fix this by navigating to the Lens Corrections panel, and here all that we need to do is to go down to the Chromatic Aberration controls. In order to correct this, we'll use this red/cyan controller, because you can see we have that color issue on each side of the branch. First, I want to exaggerate this. So I'm going to go ahead and increase this amount so that we can see it in an even more exaggerated way.
We can see that color fringing. So, in order to remove that we'll simply decrease this amount, and we'll try decreasing it maybe 10 or 15 or 20 points here, until we get it looking pretty good. Right there, the image already is looking a lot better. Click on the Flip switch. There is our before and then now our after. Now if we want to take this even further, if we want to reduce some of the other noise that we're seeing there, we can turn Defringing on. We have a couple of options. We can either defringe just the highlight edges, or all of the edges.
Now in doing that it's all of a sudden reducing a lot of the color variation, and this is kind of tricky to see here with this image, although this is looking a lot better. Here is that before and then now our after. Let's take a look at another view at defringing. I'm going to back to one of our other images. It's this one details_03, and zooming into this 3:1 rate, we can see we have all of this noise in the background. We also have some problem with luminance and color noise. Well if turn defringing in this case on to all edges, what we're going to see is it's going to reduce a lot of that.
Again, let's take a look. Here's the before and then now the after. It may be a little tricky to see, but you should start to see that some of that color noise is being pulled back. Now in this case, if we go to the Detail panel, you'll notice that I don't have any color noise reduction at all. Now if I increase this just a bit and then combine that with my Lens Correction panel down here, which is using this defringing option, these two together which can combine to create a really nice reduction of that color noise. Now it is going to be a subtle effect but nonetheless with certain images using that Defringing option can help out, not just with chromatic aberration, but with any of those areas where you have extra color noise that you want to reduce.
All right, well back to the Oak tree image for a minute. Here in this photograph we can see that we successfully corrected the color there on the branches. I'll go to the 1:1, just so I can evaluate those and then pan around the image. I want to make sure that this is working throughout the photograph. As I make my way through the image, it's looking better. Click on that Flip switch to look at your before and see if you have any problem areas you didn't target or deal with, and then also of course zoom in all the way so you can see the color problems and then turn that option again, and here you can see we have definitely corrected those chromatic aberrations.
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