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Steven G Webb
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Halos

Postby Steven G Webb » Sat Apr 02, 2016 12:24 am

One of my most disliked results of HDR is the halo effect around edges generally between higher and lower contrast areas like the line between a building and the sky. What contributes to its appearance in the merged image and what controls or adjustments can be made once the default output is reached. There are far too many available adjustment areas and too many sliders in each for me to tinker with them all to find an answer.
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Re: Halos

Postby WesternGuy » Mon Apr 04, 2016 7:51 pm

Steve, what software are you using for HDR? Are you running it as a plugin from Photoshop or Lightroom, or directly? Can you post an example, because this is not a problem that I have had and I run Nik's HDR Pro 2 as a plugin from Lightroom.

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Re: Halos

Postby Steven G Webb » Mon Apr 04, 2016 8:24 pm

WesternGuy wrote:Steve, what software are you using for HDR? Are you running it as a plugin from Photoshop or Lightroom, or directly? Can you post an example, because this is not a problem that I have had and I run Nik's HDR Pro 2 as a plugin from Lightroom.

WesternGuy


I'm using the Nik plugin for Photoshop. Since I've made exactly two attempts and I think posted them both here it's not something that has occurred but it is a condition I've seen and I figure eventually it'll happen to me. I wondered if it is something to be addressed when making the exposures, like having enough steps between ranges to "smooth" out the transition; or, if it is the result of some part of the processing overdone.
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Re: Halos

Postby WesternGuy » Tue Apr 05, 2016 5:49 pm

Steve, I am sorry but I don't think I can help you. I am using Nik's HDR Efex Pro 2 as a plugin from Lightroom and I have never, to my knowledge, had a "halo" problem. I have seen halos in others works from over sharpening, but that is not something you get from the HDR software. It is also possible that you can introduce halos in HDR Efex Pro 2 as a function of the choices that you select under the "HDR Method" panel and the strength of the method that you select - don't know. I shoot a lot of situations where the potential may be there as it is often mountains, or similar landscape features against a sky. This would be similar, I think, to the situation that you mentioned of buildings against a sky and I don't get halos.

In those situations where you have seen halos, do you know how they did their conversion - Photomatix, Nik's HDR Efex, Photoshop or some other software application?

WesternGuy
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Re: Halos

Postby Steven G Webb » Tue Apr 05, 2016 6:12 pm

Western Guy,

Maybe I'm expecting a problem that will not occur, since I too have the Nik plugin. In other forums or HDR groups I've seen halos and they've been pointed out in comments I believe the predominate software used has been Photomatix.

I've also done some Google searching. Seems like when halos occur the cure is in retouching the merge rather than adjustments in the HDR process itself. Maybe when it occurs it is something unavoidable. So for now I''ll set the worry aside and wait and see if it ever happens. Thanks so much for your insight.
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Re: Halos

Postby WesternGuy » Thu Apr 07, 2016 6:32 am

Steven, here is one approach that I came across on removing halos. It deals with Photomatix, but HDR Efex Pro might be susceptible to a similar approach if, and when, you have a halo problem - http://www.hdrone.com/2013/07/removing-photomatix-halo-tutorial-grey-matters/ .

WesternGuy
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Re: Halos

Postby Steven G Webb » Thu Apr 07, 2016 4:48 pm

WesternGuy wrote:Steven, here is one approach that I came across on removing halos. It deals with Photomatix, but HDR Efex Pro might be susceptible to a similar approach if, and when, you have a halo problem - http://www.hdrone.com/2013/07/removing-photomatix-halo-tutorial-grey-matters/ .

WesternGuy


Interesting. Thanks for the link.
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