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Sometimes, especially under point-and- shoot cameras, there will be imperfections in the lens that lead to what we call purple fringing or chromatic aberration. And there is a tool in Aperture now that allows us to address that if it becomes a problem, if we notice it. So, I want to show you the tool, and also show you what this flaw looks like. So, I took this shot with a compact camera. And I am just going to go ahead and hit the V key to open it up, and there is actually some of that fringing right here.
Now you might not be able to see it right now, but if I hit the Z key to zoom on in - see this color is not supposed to be there. See this purple fringing right here? That is a flaw in the lens. When you have a very really bright area against a very dark area, the light rays always don't quite line up just right as they hit the sensor. Now fortunately in Aperture, we have a tool to help us correct that. So, we'll go to Adjustments, and we'll go down here to Chromatic Aberration, and there we go. There is a couple of varieties.
There is the Blue/yellow variety, and the Red/Cyan variety. We have the garden Red/Cyan variety right here, very easy. All you have to do now is just move the slider just a little bit, and you can decrease that so that it goes away, and then you can check your work by clicking. Look at that. Fixes it nicely, and we are at 100%. You don't have to move the slider to the point to where you start to compromise things. See, look at this.
Now we are getting other things out of alignment, right. If we do that, see what's happening over here? Not good. So, you don't want to go to that point. You just want to bring it down just a little bit. There you go, just something like that so it isn't noticeable. That's not a bad correction at all. It just downplays it a little bit. Then we can hit the Z key. We come back out, and we have a nice, clean image. We can shoot with our compacts, and if the lenses aren't perfect, maybe we can fix them in Aperture using this tool.
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