I've been looking at some sample photos from different mobile phones and I've noticed some of them have this weird feature: edges where contrasting colors meet have an additional glow. Presumably this effect is unwanted?
Normal photo at the top, abnormal at the bottom:
Similar effect with colors. On the bottom photo there are additional highlights around each grid cell. I can kind of see them on the top photo too, but they are barely noticeable:
What is this effect called and what causes it? I think it has something to do with post-processing?
I thought it could be a halo, but all the examples I've seen are much more pronounced.
(this is the source of the photos)