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Author Topic: Getting in all the dynamic range.  (Read 5356 times)

Bart_van_der_Wolf

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Re: Getting in all the dynamic range.
« Reply #20 on: December 26, 2010, 11:00:13 am »

I wonder if painters spend so much of their time discussing brushes?

Yes, they already did it centuries ago, and they even didn't have internet to do it so they had to travel to learn new techniques:
http://en.wikipedia.org/wiki/Chiaroscuro
http://en.wikipedia.org/wiki/Sfumato
http://en.wikipedia.org/wiki/Cangiante
http://en.wikipedia.org/wiki/Tenebrism

Cheers,
Bart
« Last Edit: December 26, 2010, 11:10:38 am by BartvanderWolf »
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ErikKaffehr

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Re: Getting in all the dynamic range.
« Reply #21 on: December 26, 2010, 11:07:16 am »

Hi,

No problems with your English. Much better than my Spanish, OK?

Phase, for instance, has a lot of individual calibration data for the sensor imbedded in the image. Capture One can use it, and it may be an advantage.

Best regards
Erik
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Erik Kaffehr
 

ziocan

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Re: Getting in all the dynamic range.
« Reply #22 on: December 27, 2010, 08:06:04 am »

..... and need to blend two exposures but that's getting OT.
Yea, be very careful. ;)
« Last Edit: December 27, 2010, 08:07:48 am by ziocan »
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Anders_HK

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Re: Getting in all the dynamic range.
« Reply #23 on: December 27, 2010, 08:41:24 am »

I've been using the Aptus 65 for around 3 years. I do see the immediate advantage of the higher dynamic range.

Recently when working with a friend, he mentioned that alot more of the dynamic range captured by the Aptus is
only available during "recovery", like either recovering the highlights or shadow area, or when adjusting the exposure
of the image post processing. Is there a way to compress all the information into 1 image ? ala film look ?

I know this is a loaded question, I just started moving back towards film for some of my jobs after 8-9 years riding
the digital wave and certain things I took for granted are starting to appear right before my eyes now.

I read somewhere on the net that negative film supposedly has 13 stops of dynamic range and digital backs can
achieve 12 stops. So how do I contain all that information into 1 image ?

rgs
rueyloon

Hi,

Coincidentally my Aptus 65 is also about three years old  ::). That aside...

Did you consider using the Zone system? - seriously. I did an online search the other week, here is one article on 'digital zone system' http://dpanswers.com/content/tech_zonesystem.php#ex

ETTR or not depends on the scene captured. If not high dynamic range there seem little reason to ETTR using MFDB. On other hand if high dynamic range scene - and if have predetermined in stops the very brightest that our Aptus can capture details of with and without highlight recovery in C1, and likewise the very darkest with details using shadow slider - then we can accurately meter the given scenes and exact pre-visualize and expose for what we will CAPTURE. Exact like Ansel Adams taught us (albeit not within -2.5 and +2.5 stops for slide film of course).

The task will then be how we PRE-VISUALIZE and CONVERT the above captured zones to the PROCESSED ELECTRONIC IMAGE (C1  :P), and our PRINT. That is the "digital" interpretation of book three of Ansel Adams  ;D.

Regards
Anders
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ErikKaffehr

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Re: Getting in all the dynamic range.
« Reply #24 on: December 27, 2010, 11:20:01 am »

Hi,

Basically, the idea with ETTR is to maximize signal noise ratio. It is essentially exactly the same as shooting low ISO film.

Theoretically, noise is proportional to square root of captured photons while signal is proportional to exposure. So, four times the exposure will double SNR (Signal Noise Ratio).

Best regards
Erik


Hi,

Coincidentally my Aptus 65 is also about three years old  ::). That aside...

Did you consider using the Zone system? - seriously. I did an online search the other week, here is one article on 'digital zone system' http://dpanswers.com/content/tech_zonesystem.php#ex

ETTR or not depends on the scene captured. If not high dynamic range there seem little reason to ETTR using MFDB. On other hand if high dynamic range scene - and if have predetermined in stops the very brightest that our Aptus can capture details of with and without highlight recovery in C1, and likewise the very darkest with details using shadow slider - then we can accurately meter the given scenes and exact pre-visualize and expose for what we will CAPTURE. Exact like Ansel Adams taught us (albeit not within -2.5 and +2.5 stops for slide film of course).

The task will then be how we PRE-VISUALIZE and CONVERT the above captured zones to the PROCESSED ELECTRONIC IMAGE (C1  :P), and our PRINT. That is the "digital" interpretation of book three of Ansel Adams  ;D.

Regards
Anders
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NikoJorj

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Re: Getting in all the dynamic range.
« Reply #25 on: December 28, 2010, 08:48:54 am »

The task will then be how we PRE-VISUALIZE and CONVERT the above captured zones to the PROCESSED ELECTRONIC IMAGE (C1  :P), and our PRINT. That is the "digital" interpretation of book three of Ansel Adams  ;D.
Indeed, I still haven't found a better book on this topic.
The tools described are old chemical ones, so you may want to skip the kitchen recipes ::) , but the descriptions of what makes a good print in Ansel Adam's eye are still very valuable today.

I use either Leaf Capture or Adobe RAW to convert my files
In Adobe Camera Raw, you can compress the tonemapping on the shadow side very effectively with the Fill Light tool ; it does something analog to a local contrast enhancement and dodging in the shadows, so to speak. You may have to adjust the Blacks level after that.
There is also the possibility to compress the highlights with the Recovery tool, but there may be more side effects (hue shifts sometimes).

You may also want to play on the global tonality curve or on some parts of it, eg by adjusting brightness on one way and counteract with exposure on the other, but (as with the reduced development trick) the local contrast may suffer in the compressed areas with these global tools.
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Doug Peterson

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Re: Getting in all the dynamic range.
« Reply #26 on: December 29, 2010, 11:40:15 am »

As promised, here is an article on using Capture One Pro to do tone mapping without leaving the raw file (no need to process the file first):

http://www.captureintegration.com/2010/12/28/hdr-via-lcc/

Like anything HDR is VERY easy to way over do. If it "looks" like an HDR file then you've probably gone too far (at least for my aesthetics).

Use in moderation can tap into some of the reserve DR of a medium format back.

Doug Peterson (e-mail Me)
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