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Post processing Halo's
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Feb 15, 2019 15:06:24   #
ken_stern Loc: Yorba Linda, Ca
 
Could use some HOG expert advice -- revisiting & re-post-processing via DxO PhotoLab some photos taken while in Pompeii a few yrs back
Have posted two photos -- 1) RAW & 2) the best so far as I can do with the image

Question: I'll call them Halos showing up around the columns ---- Any thoughts on how I can reduce if not totally eliminate them???

Any thoughts/advice will be greatly appreciated !!!

THANKS


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Feb 15, 2019 15:25:57   #
timcc Loc: Virginia
 
Try reducing the clarity and/or sharpening in PP. That may help reduce or remove the halo effect.

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Feb 15, 2019 15:33:05   #
ken_stern Loc: Yorba Linda, Ca
 
Made an attempt at that - But may need to do more
thanks I'll try that

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Feb 15, 2019 16:06:22   #
Weddingguy Loc: British Columbia - Canada
 
ken_stern wrote:
Could use some HOG expert advice -- revisiting & re-post-processing via DxO PhotoLab some photos taken while in Pompeii a few yrs back
Have posted two photos -- 1) RAW & 2) the best so far as I can do with the image

Question: I'll call them Halos showing up around the columns ---- Any thoughts on how I can reduce if not totally eliminate them???

Any thoughts/advice will be greatly appreciated !!!

THANKS


Would be much easier if starting with the original RAW file, but basically what I did was separate the columns from the background to adjust the background separately . . . then add back the columns.

Hope that gives you the idea.


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Feb 15, 2019 16:35:27   #
ken_stern Loc: Yorba Linda, Ca
 
You did good -- real good -- Pretty sure I can preform that process with PhotoLab -- Just need to figure out just how -- Knowing it can be done is a great help

Thanks for your help!!!

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Feb 15, 2019 16:51:37   #
Weddingguy Loc: British Columbia - Canada
 
ken_stern wrote:
You did good -- real good -- Pretty sure I can preform that process with PhotoLab -- Just need to figure out just how -- Knowing it can be done is a great help

Thanks for your help!!!


No problem. Here is a shot of the foreground and background separated on two different layers.. I then used the clone tool to move the darker part of the image along the length of the columns over top of the "halo" part on the background layer as you can see . . . then put the other layer, the cutout columns, back over the background.


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Feb 15, 2019 17:51:02   #
ken_stern Loc: Yorba Linda, Ca
 
Again ----
Thanks

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Feb 15, 2019 22:41:12   #
rgrenaderphoto Loc: Hollywood, CA
 
ken_stern wrote:
Could use some HOG expert advice -- revisiting & re-post-processing via DxO PhotoLab some photos taken while in Pompeii a few yrs back
Have posted two photos -- 1) RAW & 2) the best so far as I can do with the image

Question: I'll call them Halos showing up around the columns ---- Any thoughts on how I can reduce if not totally eliminate them???

Any thoughts/advice will be greatly appreciated !!!

THANKS


Reducing clarity weill do it, also did you apply any HDR effects? If so, dial it down a bit.

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Feb 16, 2019 03:59:48   #
R.G. Loc: Scotland
 
As already mentioned, Clarity is the usual suspect along with any HDR processing (including using presets and/or merging exposure bracketed shots) which I suspect use no small amount of Clarity as standard. However, my suspicion is that even raw files get some in-camera processing which I suspect includes a touch of Clarity-like boosting. The trouble is, such a file will produce diffuse haloing even if the only thing you add is Contrast, or lifting the Shadows, because the root cause of the haloing is there already straight from the raw file. It's not as pronounced as when you add your own Clarity in PP, but it's there and if you want to avoid that kind of haloing you're limited in how much contrast you can add.

Whenever I get this problem I use a well-feathered Adjustments brush to select the halo and use negative Highlights and negative Clarity and/or Contrast adjustments to subdue the haloing. The trick is to use the feathered area of the brush to coincide with the fading out of the haloing (most intense at the high contrast edge that's producing the haloing, and reducing in intensity as you move away from the edge), then deleting any of the selection that's on the wrong side of the edge. The problem is if the diffuse haloing was severe those steps will have a limited effect.

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Feb 16, 2019 07:18:35   #
Gene51 Loc: Yonkers, NY, now in LSD (LowerSlowerDelaware)
 
ken_stern wrote:
Could use some HOG expert advice -- revisiting & re-post-processing via DxO PhotoLab some photos taken while in Pompeii a few yrs back
Have posted two photos -- 1) RAW & 2) the best so far as I can do with the image

Question: I'll call them Halos showing up around the columns ---- Any thoughts on how I can reduce if not totally eliminate them???

Any thoughts/advice will be greatly appreciated !!!

THANKS


It seems you have the HDR "Halo" effect because you applied an HDR effect with a pretty heavy hand.

Separating and cloning the background doesn't provide a realistic image, unless your cloing is absolutely perfect.

You may want to reprocess the raw image, using DXO's excellent shadow and highlight recovery tools. If I had the time I'd mask out the columns, and using a very light local adjustment brush, darken the resulting edges where the background meets the column. But this is more easily done in On1 or Photoshop.


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Feb 16, 2019 08:30:53   #
jerryc41 Loc: Catskill Mts of NY
 
Weddingguy wrote:
Would be much easier if starting with the original RAW file, but basically what I did was separate the columns from the background to adjust the background separately . . . then add back the columns.

Hope that gives you the idea.



Very nice result.

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Feb 16, 2019 09:50:06   #
Weddingguy Loc: British Columbia - Canada
 
jerryc41 wrote:
Very nice result.


Thanks Jerry

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Feb 16, 2019 09:54:28   #
Alafoto Loc: Montgomery, AL
 
Weddingguy wrote:
Would be much easier if starting with the original RAW file, but basically what I did was separate the columns from the background to adjust the background separately . . . then add back the columns.

Hope that gives you the idea.


Very impressive!

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Feb 16, 2019 12:59:04   #
mwsilvers Loc: Central New Jersey
 
ken_stern wrote:
Again ----
Thanks

There are no layers in Photolab of course, but you might be able to get a similar effect with the careful application of local adjustments along the column edges. I think the origin of the problem you're having is due to the very bright light reflecting off the center column in your original image. Although you refer to those anomalies as halos, they are not really common halo artifacts, which are sharp light colored lines following along the edges of objects as a result of over sharpening.

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Feb 16, 2019 14:33:20   #
amfoto1 Loc: San Jose, Calif. USA
 
There's a limit to how much can be done using the JPEG you uploaded here.... working from the original RAW would make for much better results (mostly, much more recovery of the blown out highlights).

Rather than try to fix your edited example, I tried different editing from your original. I used Photoshop to do selective editing with Layers & Masks.

1. First I created a layer that's an exaxt copy of the background. I temporarily "turned it off", in order to work on the background.

2. Next I lightened the background layer to bring up the detail in the most heavily shaded areas. Doing this overly

3. Then I turned the top/copy layer back on and reduced the exposure of that to try to recover some of the blown out highlights (there wasn't a lot I could do with the JPEG).

4. Next I created a mask on the top layer and using a "black brush" I "painted away" all but the highlight areas (the doorway, the one column and the floor at it's base). This reveals the background.

The great thing about using a mask in this way is that you can correct any mistakes simply by switching to a "white brush" and painting it back. You also can change the size, hardness versus feathtering, shape and transparency of the tool you're using to make the mask. It's possible to make gradients and blends, too. I often do those by first "painting away" an area with a black brush, then switching to a 10% or 20% white brush and painting with that for only partial recovery.

This selective adjustment is similar to what others did above, I think. The key is having the ability to separately adjust the shadow areas and the highlight areas. Both extremes are exceeding the capabilities of the camera.... and what's needed in each is the opposite of the other! In other words, the scene has a dynamic range greater than the camera can capture in a single image. These adjustments are, in effect, reducing that dynamic range to something manageable. This is what HDR tries to do. I just did it manually instead, which gives me more control over exactly where the adjustments are applied.

It's not great, but better. At least there are no halos now:


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