What causes Halo-ing?

jpgreenwood

jpgreenwood

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jason
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Particularly around edges of buildings, structures or land/sky borders. The white halo effect. Is this due to too much editing? If so, what particular edit causes this, and how do you prevent the halo?
 
Something I've been grappling and struggling with lately as I get back into landscapes.

IME, so far, chromatic abberation correction can cause it, too much clarity, sharpening and heavy shadow recovery.

I hate halos, pesky things, but, try this, it goes some way to rectifying them almost completly,


View: https://youtu.be/ohGqYQ1Oa7U
 
In some of my wildlife shots, particularly shots against water I can often detect a small halo edge (e.g. around a birds head) simply exporting directly from Nikons Capture NX-D, before any processing by me.
 
I used to find that too much "Clarity" in Lightroom was a major contributor.
 
Dale. said:
Something I've been grappling and struggling with lately as I get back into landscapes.

IME, so far, chromatic abberation correction can cause it, too much clarity, sharpening and heavy shadow recovery.

I hate halos, pesky things, but, try this, it goes some way to rectifying them almost completly,


View: https://youtu.be/ohGqYQ1Oa7U
Click to expand...

That's a very handy method and not one that I've seen before, thanks!


Brian G said:
I used to find that too much "Clarity" in Lightroom was a major contributor.
Click to expand...

Yep, I completely avoid using the Clarity slider for this reason. Over use of Dehaze can produce similar haloing or, as Dale says above (and this is usually my downfall) heavy shadow recovery.
 
More than sharpening I find working highlights & shadows, black & white point sliders & contrast to cause halos. Some software is terrible for adding halos and shadows too - Nik Silver Efex is really dreadful if you push the contrast a bit, adding both an outline AND smearing darker tones into adjacent brighter areas. Example - look at the top of the chimney!

factory 2 by Toni Ertl, on Flickr

The only solution is to clone out the ruined areas, although I may try something like Dale posted, but in On1 Photoraw.
 
Often caused by masking, but without masking the subject well enough, reduce the pixels on the mask by 1 will sometimes cure it
Mainly its due to over aggressive sharpening though
 
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