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Sky masking causing fringe on the horizon

Contributor ,
Jul 31, 2024 Jul 31, 2024

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Hi, I've got a bunch of images taken outside with a rolling hill in them. Two things break this hill: the subject couple (wedding image) and a dead tree.

I did a "Select Sky" mask in Lightroom Classic and wanted to make the clouds more dramatic (as they were at the time). Now I could lower the exposure, or highlights, or whites, or dehaze - or a combination of all of these. Indeed that's what I did - a combination.

The problem is that the mask selects a little bit of the top of the hill so when you lower anything you get a bit of a "ring edge" or "fringe" to the hill (it is less noticable around the couple themselves).

I've tried only adjusting one of those things at a time and the issue remains much the same.

 

Before:

Screenshot 2024-07-31 080356.png

After - note the "double line" of the horizon.

Screenshot 2024-07-31 080341.png

 

Before:

Screenshot 2024-07-31 074534.png

After:

Screenshot 2024-07-31 074551.png


I know it's the mask as when I simply lower the exposure dramatically I can see the effect well - it must be selecting part of the hillside and/or feathering and including the hillside.

Screenshot 2024-07-31 075330.png

 


Any idea of a quick fix as I've got a couple of dozen like this to work on?

My best attempt so far is to use a big soft brush to run along the divide and deselect some of the bottom of the sky but that means it gets bright at the horizon which isn't ideal.

 

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Community Expert ,
Jul 31, 2024 Jul 31, 2024

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This effect is inevitable if you make too strong adjustments with a mask. In my experience you should not go over an adjustment of about -1 stop. You can try to solve this by subtracting an inverted sky mask. Their may sound odd at first (you would think that this will do nothing to the mask), but you will see that this does make a difference, and sometimes improves the mask.

 

-- Johan W. Elzenga

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LEGEND ,
Jul 31, 2024 Jul 31, 2024

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See the following (others exist on the web):

 

https://www.youtube.com/watch?v=1OiFSYrWKGU

 

Note that you could create a preset for this.

 

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Contributor ,
Aug 01, 2024 Aug 01, 2024

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@JohanElzenga @GoldingD  thank you both.

 

My adjustments didn't seem huge at all but I was intrigued by the masking trick.

 

That's an interesting hack - odd that there is even a difference! I did try it and it didn't make much (any) difference.

I went back to basics and took the mask off. I reset all the image sliders and just dropped exposure by a silly amount to see what is there at all.

MalthousePhotography_0-1722498930521.png

As you can see there's a bit of a "halo" on the horizon just doing that.

On that basis I have to concede that what I've got is probably the best I'm going to get for these particular images.

Thank you for your suggestions.

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