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Author Topic: HDR Tips  (Read 3924 times)

dobson

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« on: November 09, 2006, 03:13:35 pm »

Last weekend at Hyalite Canyon, I had the pleasure of starting ice season. The canyon is quite beautiful, but turned out to be difficult to photograph.

The climb I was photographing was in the shade while the opposite wall was in bright sun. When I would expose the foreground ice, the sky and mountains would be blown. But exposing the sky resulted in dark, noisy shadows of the trees and climber. I did not have a tripod with me, (nor would it have done any good as I was on rappel). I shot many bracketed frames to play around with in photoshop.

My first attempt was with two frames, one for the sky and another for the foreground, overlayed and masked. The problem with this method was alignment because they were shot handheld.

My second attempt was to make 2 conversions of the same frame and blend them. The foreground became unacceptably noisy in this case.

Another pressing issue is the uneven border between the light and dark areas; it is difficult to accurately mask off the trees.

[attachment=1177:attachment]

Does anyone know of tricks to solve these problems. Maybe software to align nearly identical frames or to clean up the noise. Any advice would be greatly appreciated.

Thanks;
Phillip
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jmb

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« Reply #1 on: November 09, 2006, 03:40:43 pm »

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Does anyone know of tricks to solve these problems. Maybe software to align nearly identical frames or to clean up the noise. Any advice would be greatly appreciated.

You could use PTAssembler or one of the other Pano Tools front-end GUIs to align the pictures. It works ok, but you will probably still need to mask out certain problem areas...

JMB
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Andy M

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« Reply #2 on: November 09, 2006, 04:22:56 pm »

Check out: http://petemc.net/hdr-guide/

I hope you don't mind, but I had a quick play to give you an idea:

« Last Edit: November 09, 2006, 04:34:13 pm by Andy M »
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thompsonkirk

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« Reply #3 on: November 09, 2006, 05:06:47 pm »

Andy's version is pretty good, but you can improve it with Shadow/Highlight.  

Kirk
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John Sheehy

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« Reply #4 on: November 09, 2006, 05:31:13 pm »

Your attachment is not useable for recovery.  Somewhere in your workflow, you lost shadows to clipping.  The entire dark area of trees, and patches of the climber's suit have 0 luminance.  You can never recover tree detail from this, and the ice is too blue because of it as well.  how did you wind up with this black-clipped image?  If you're using ACR, turn the shadows slider down to zero if you want to recover shadows.  It's a must.
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John Sheehy

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« Reply #5 on: November 09, 2006, 05:32:48 pm »

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Andy's version is pretty good, but you can improve it with Shadow/Highlight. 
[a href=\"index.php?act=findpost&pid=84370\"][{POST_SNAPBACK}][/a]

Shadow/Highlight could do a decent job on this, if the shadows weren't completely clipped.  The blue tint of the ice can be reduced by dragging the "color correction" slider, which affects mainly shadow areas.
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Andy M

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« Reply #6 on: November 09, 2006, 05:54:40 pm »

Have altered it now
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dobson

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« Reply #7 on: November 10, 2006, 12:44:56 am »

Thanks for the imput guys. I'm working right now on the tips you gave me. I know that the .jpeg posted is unrecoverable, it was just to show what it looked like as an unedited .jpeg. The RAW file has detail in the shadow areas but it is very noisy. If anyone would like the .cr2 file to play with you could PM me and I will email it or something.


Thanks again,
Phillip
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