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What is this on the image near the edge?


penn10

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Dunno if Photoshop offers this, but Corel Paint Shop Pro X offers quick fix tools for two kinds of CA - the familiar optical type that plagues many lenses, and the purplish fringing peculiar to digital. It's possible a digital CA filter might fix this easier than clone stamping or other tools.
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Looks a little like purple fringing, a lens chromatic aberration that occurs in high contrast areas, in this case on a reflective highlight caused by the sheen of the hair. Google it and you'll find lots of examples. Software can alleviate it and some cameras such as the new Nikon D300 can correct for it in camera. Not uncommon in even the most expensive lenses.
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