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macrumors 6502a
Jan 4, 2015
Key West FL
You'll likely find that true axial CA (out of focus purple "glow" around edges) can only be mitigated by desaturating the purple (magenta-red) area. The automatic CA removal algorithms found in most software only works on lateral CA (purple on one edge and green on the opposite side's edge and can also be a blue-yellow pairing). Since lateral CA is an alignment/scaling issue it can be fixed mathmatically. Axial CA is a focus issue and would involve selectively sharpening only the colors involved, which in an RGB image can't easily, if it's even possible, be isolated algorithmicly.
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