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So, looks like Chromatic Aberration. Nothing to do with the Sky Mask, although the mask is helping you see it.
https://www.adobe.com/creativecloud/photography/discover/chromatic-aberration.html
https://fstoppers.com/originals/how-remove-color-fringing-lightroom-496247
In the Lens Corrections> Profile panel make sure 'Remove Chromatuc Aberration' is checked. This should remove the chromatic fringing in the Select Subject mask.
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So, looks like Chromatic Aberration. Nothing to do with the Sky Mask, although the mask is helping you see it.
https://www.adobe.com/creativecloud/photography/discover/chromatic-aberration.html
https://fstoppers.com/originals/how-remove-color-fringing-lightroom-496247
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Ahh.. I do recall reading about this a bit before, and did just assume it was a masking thing. I'll look into the chromatic aberration aspect a bit more and keep that in mind next time, as it seems to be something much easier to solve naturally in camera, like most things. Thanks for the response!
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In the Lens Corrections> Profile panel make sure 'Remove Chromatuc Aberration' is checked. This should remove the chromatic fringing in the Select Subject mask.
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Totally, and in many photos, that's the fix. Strangely, with this image, the box is checked, there doesn't seem to be any until I select the subject, and in lightening the subject, the contrast between that and the dark background is when the outline appears.
thanks for the reply!
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You will want to correct that early on, well before any masking
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It's interesting really, since this was a low light situation and I was trying to enhance the subject, I reset the photo from any edits, and there doesn't seem to be any chromatic aberration until I select the subject and begin to enhance it. So, I'm not saying there is none present, but I believe it's definitely emphasized when Lightroom is asked to separate the subject from the background and amplifies the contrast.
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If you can post the file to Dropbox or other file sharing site we can take a look at what's happening.