On 27/08/2018 18:55, Savageduck wrote:
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To me the problem looks like chromatic aberration (CA) with purple fringing.
If I remember correctly, you are using Lightroom. If so you should be able to
correct that CA in Lightroom.
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Fringing would be towards the edges of the image. Here I believe the
problem is the person with the white shirt and fawn trousers in the
distance. The shirt the hair or hat are just poking out in front of the
horse's head.

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Cheers,
David
Web: http://www.satsignal.eu