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FORUMS Post Processing, Marketing & Presenting Photos RAW, Post Processing & Printing 
Thread started 29 Aug 2013 (Thursday) 13:18
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HDR vs Lightroom

 
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Aug 31, 2013 06:59 |  #16

tzalman wrote in post #16255649 (external link)
So the trick is in knowing your camera and its practical DR. The measurements on dxomark.com may be scientifically accurate but I think most people would agree that they are over-optimistic and about two stops too high. For my 5D2, shooting Raw, I figure about 10 stops for ISO 100/200, 9.5 stops at ISO 400, 9 stops at ISO 800 and around 7.3 stops at ISO 1600. Above 1600 subtract a full stop for each doubling of ISO.

Well I wouldn't say they are optimistic since they never say you will be able to capture the DR figures they provide. They just took an engineering definition of DR based on a SNR=0dB.

For practical photographic applications, a much more logical criteria IMO is SNR=12dB, which is a good representation of the max amount of tolerable noise in general photography:

IMAGE: http://www.guillermoluijk.com/article/digitalp02/ruido_0db_12db.jpg


Since DR is defined by the SNR in the deep shadows (which is where the presence of noise really hace consequences), and the constant read noise is dominant there over photon noise, the SNR improves by 1 entire stop (or 6dB) for every extra stop of RAW exposure. That means that we can take DxOMark's DR figures and correct them by -2 stops of practical DR, which is the same correction as you suggest.

So in practice: want to know the DR of real world scenes you'll be able to capture with a given camera at a given ISO without needing to make several exposures? take DxOMark's DR figure, substract 2 stops to it, and that's it.

Regards

http://www.guillermolu​ijk.com (external link) to subscribe click here (external link)

  
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René ­ Damkot
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Aug 31, 2013 08:05 |  #17

LV Moose wrote in post #16250677 (external link)
I recently purchased LR5, and was wondering how adjusting "highlights", "whites", "blacks", and "shadows", "vibrance", and so on, compared to tonemapping or fusing in Photomatix. Here is a picture done all three ways (the tonemapped and fused images were the result of three exposures).

I prefer #3. #1 is too flat in the rocks, #2 is too dark in the clouds IMO.

On LR controls: http://mulita.com/trai​ning/hns-r/ (external link)


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kirkt
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Aug 31, 2013 11:46 |  #18

Metering the scene helps. This scene has a tremendous amount of fill light from the sky and the bounced direct lighting from the sun, so the shadows are filled pretty well, making the overall dynamic range manageable for a single exposure and raw conversion.

kirk


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HDR vs Lightroom
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