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Pixelation in HDR
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Oct 6, 2014 00:15:58   #
Toni's Vision Loc: Quincy, Illinois
 
I've searched for this topic in the archives but I'm unable to find it. I have been trying to teach myself how to do HDR. One problem that seems to arise frequently is pixilation in the tree branches of a landscape photo. I do click on the ghosting box to avoid that and I go through each image to choose the best one so this doesn't happen. I was in a hurry this time trying to get a picture done for someone and I thought this picture was free of pixilation but I discovered after I was done processing it that it did indeed have pixilation in the leaves. Does anyone know a good way to avoid this problem in the first place AND is there a way to fix this in photoshop after it has happened other than pixel by pixel or cloning? The cutout to show the pixilation is blurry from being a copy and paste but you should get the idea. Thank you for any help or suggestions. In the mean time I will continue to look for tutorials.





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Oct 6, 2014 00:24:27   #
speters Loc: Grangeville/Idaho
 
Toni's Vision wrote:
I've searched for this topic in the archives but I'm unable to find it. I have been trying to teach myself how to do HDR. One problem that seems to arise frequently is pixilation in the tree branches of a landscape photo. I do click on the ghosting box to avoid that and I go through each image to choose the best one so this doesn't happen. I was in a hurry this time trying to get a picture done for someone and I thought this picture was free of pixilation but I discovered after I was done processing it that it did indeed have pixilation in the leaves. Does anyone know a good way to avoid this problem in the first place AND is there a way to fix this in photoshop after it has happened other than pixel by pixel or cloning? The cutout to show the pixilation is blurry from being a copy and paste but you should get the idea. Thank you for any help or suggestions. In the mean time I will continue to look for tutorials.
I've searched for this topic in the archives but I... (show quote)

I can not see a whole lot of "pixilation" (noise?), but rather a high degree of PP artifacts (incl. jpeg artifacts). May I asked how you proceed on your HDR's (workflow)?

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Oct 6, 2014 00:31:08   #
Toni's Vision Loc: Quincy, Illinois
 
Hi speters. I'm not surprised that I used the wrong terminology but you can see the problem in the leaves. There's chromatic aberration some of which I have removed but there are pixels that should be dark which are light and some that are light which should be dark which interrupts the edges between the leaves. I use HDR Pro in Photoshop cs6. I check the remove ghosting box and in this case I used the 32 bit mode. I saved it as a tiff file, made adjustments in camera raw, and then more processing in photoshop.

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Oct 6, 2014 00:47:50   #
Toni's Vision Loc: Quincy, Illinois
 
Also I should add that in saving the file as a tiff.. I don't save the picture as a jpeg until I am finished with it. I sometimes will save an image that I'm working on to take a break and look at it with fresh eyes. When I do so.. I always save it as a tiff file. Jpeg is for the final product.

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Oct 6, 2014 01:43:29   #
speters Loc: Grangeville/Idaho
 
Toni's Vision wrote:
Also I should add that in saving the file as a tiff.. I don't save the picture as a jpeg until I am finished with it. I sometimes will save an image that I'm working on to take a break and look at it with fresh eyes. When I do so.. I always save it as a tiff file. Jpeg is for the final product.
You have a very (and I mean VERY) bright spot/area of sun light in your picture. How many stops of over-and under- exposure did you use for your HDR, I mean, did you use even steps, or more for "under", or "over", as that can make quite the difference. For example, if you use a 3 stop exposure adjustment evenly for over-and under, and you have already an almost "clipped" image (like in the sun area) that part of the image will be so much over exposed (with artifacts showing) that will be hard to remove after (but not at all in the HDR process of the software). That is one part one has to pay attention to, it can easily be over "done"/cooked". This is different from "overcooking" the amount of tone mapping!

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Oct 6, 2014 01:47:55   #
TucsonCoyote Loc: Tucson AZ
 
Yes I don't see pixilation but the "chromatic aberration" you mention may just be due to the blown out condition in that area of the picture due to the sun ! ??...MAYBE??
speters is on the same track I'm on, I see! :)

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Oct 6, 2014 04:53:23   #
rpavich Loc: West Virginia
 
To add to the discussion; HDR will put halos around everything and leaves are no exception.

I'm wondering if the movement of the leaves is the culprit or the halos?

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Oct 6, 2014 06:05:49   #
Billyspad Loc: The Philippines
 
It is very hard to avoid because of the reasons mentioned. A way around it is to adjust one of the original images in Camera Raw and Photoshop using Nik or Topaz filters until the part you wish to adjust is the same tone and colour as your HDR image. Stack the two with the HDR image on top and use a mask to brush the affected area through from the original you have altered to suit.
Phew hope that makes sense but it does work I can assure you. Topaz or Nik are essential for this trick usually but it gets rid of areas of CA movement and ghosting.

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Oct 7, 2014 13:26:13   #
LoneRangeFinder Loc: Left field
 
There used to be some "HDR masters" in the UHH HDR section. They were able to successfully create HDRs without the halos and without pixelation. It is not inevitable; it just takes work.

The two I recall were "Andrew Haysom" & "Conkerwood". They both included their work flows and produced quality images. Neither seems to post in that forum as regularly as they used to.

The best advice? Look them up.

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Oct 7, 2014 20:26:43   #
kymarto Loc: Portland OR and Milan Italy
 
This is Photomatix, right? Photomatix has a tendency to produce dark artifacts in overexposed areas. You can try selective deghosting, or more bracket frames (darker maximum underexposure). Try also a different algorithm such as Contrast Optimizer.

Another option is to create a radiance file and open in a different HDR program such as Expose 3 or SNSHDR, then mask on problem areas in PS.

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Oct 8, 2014 00:47:04   #
marcomarks Loc: Ft. Myers, FL
 
Toni's Vision wrote:
Hi speters. I'm not surprised that I used the wrong terminology but you can see the problem in the leaves. There's chromatic aberration some of which I have removed but there are pixels that should be dark which are light and some that are light which should be dark which interrupts the edges between the leaves. I use HDR Pro in Photoshop cs6. I check the remove ghosting box and in this case I used the 32 bit mode. I saved it as a tiff file, made adjustments in camera raw, and then more processing in photoshop.
Hi speters. I'm not surprised that I used the wr... (show quote)


I'm not familiar with HDR Pro in Photoshop and whether it has it - but using Fusion instead of HDR creates less halo problems although it still has it.

That's a pretty intense bright area you're trying to get under control there. Have you zoomed in and looked at the 0 EV frame of the several you took for creating an HDR to see if the halo'ing is on it? If so, you may be blaming HDR for a problem that is just a weakness of digital in general.

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Nov 28, 2014 17:31:26   #
Wallbanger Loc: Madison, WI
 
I've found the best way to avoid bad, over used HDR is simply to not do HDR. :)

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Nov 28, 2014 17:35:27   #
lightcatcher Loc: Farmington, NM (4 corners)
 
Wallbanger wrote:
I've found the best way to avoid bad, over used HDR is simply to not do HDR. :)


Hdr has always had been a good use in photography, just here lately some are pushing to dam hard. Hurts the eyes.

http://www.uglyhedgehog.com/t-254688-3.html#4442646 last one.

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Nov 28, 2014 17:42:20   #
Wallbanger Loc: Madison, WI
 
lightcatcher wrote:
Hdr has always had been a good use in photography, just here lately some are pushing to dam hard. Hurts the eyes.

http://www.uglyhedgehog.com/t-254688-3.html#4442646 last one.


Yep.

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Nov 28, 2014 18:55:31   #
Billyspad Loc: The Philippines
 
lightcatcher wrote:
Hdr has always had been a good use in photography, just here lately some are pushing to dam hard. Hurts the eyes.

http://www.uglyhedgehog.com/t-254688-3.html#4442646 last one.


Your "example" may not be the best HDR in the world but may be the guy is learning the ropes? Not sure its totally fair to put a link to his work with a comment you may have thought was amusing.
He is brave enough to post his work I may be mistaken but I cannot find any of your pictures here. Think your post was slightly disrespectful and does not help answer the original thread at all.

Kindest regards

Billyspad

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