Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
08-26-2015, 06:07 AM   #1
Veteran Member




Join Date: Sep 2012
Photos: Gallery | Albums
Posts: 1,728
ISO invariance and PP possibilities (link)

DPReview has an interesting article on ISO invariance of the A7R II but the principles probably apply to a whole host of cameras, especially all of the ones using Sony sensors. Basically, the conclusion is the image exposure can be boosted so much in PP that, in many cases, it makes sense to shoot with very high underexposure and then adjust afterward. This to protect highlights above all.

My question (based on not being all that fluent in PP) -- if one were to shoot with EC set to -2 or even -3 almost all of the time, what would be the correct set of default adjustments in PP? My hunch is it must be more involved than simply boosting exposure by +2 or +3 and then shoving the highlight slider as far as necessary. Are there other sliders that should be included in a general starting point? Does order of operation matter? Is this idea too dumb to even be worth playing with?

http://www.dpreview.com/articles/7450523388/sony-alpha-7r-ii-real-world-iso-invariance-study

08-26-2015, 07:48 AM   #2
Pentaxian




Join Date: Jan 2011
Location: New York
Posts: 4,833
I often follow these steps when adjusting exposure in Lightroom. My K-5 probably isn't as ISO invariant as the A7RII, but I can push shadows a lot, avoiding the extra processing and often overprocessed look of HDR.

1) Adjust the exposure slider if the photo is ridiculously underexposed (or overexposed).
2) Adjust the white point slider while holding down Alt to see clipped highlights.
3) Adjust the black point slider while holding down Alt to see clipped shadows.
4) Adjust shadow and highlight sliders if the scene calls for it.
08-26-2015, 07:49 AM   #3
Veteran Member
Na Horuk's Avatar

Join Date: Feb 2012
Location: Slovenia, probably
Photos: Gallery | Albums
Posts: 11,186
So this is different from Exposing to the right (ETTR), where you expose as brightly as you can without clipping highlights? Interesting.
QuoteOriginally posted by IchabodCrane Quote
what would be the correct set of default adjustments in PP? My hunch is it must be more involved than simply boosting exposure by +2 or +3 and then shoving the highlight slider as far as necessary.
I guess this depends on the PP software. If it has numbers for Exposure that mimic EV progression, then yes, +2 would be used to combat -2 in-camera. But as a rule, each new camera requires slightly different PP. I remember how some users had problems with K-3, before they got the hang of the processing. After that, they got better results than with their older camera. So things like Contrast, Saturation, NR might need changes, as well.
08-26-2015, 08:09 AM   #4
Veteran Member




Join Date: Jun 2008
Location: Flyover America
Posts: 4,469
I read the article carefully.
At first blush it seemed excessively hypothetical with little relevance to the real world limitations of camera use.
But he might be on to something - I'll try it and see what happens.

QuoteOriginally posted by IchabodCrane Quote
what would be the correct set of default adjustments in PP?
I doubt there is any such thing especially when you are pushing the limits of a sensor. It's PP by the seat of the pants where you must trust your eye not some canned procedure.
My guess is it would be about the same as a ETTR exposure in RAW - Push up exposure until it looks roughly right than balance out low, mid and high tone as close as you can, bring it into Photoshop for a careful manual WB and then worry about a precise local tonal range that looks about right to your eye.


Last edited by wildman; 08-26-2015 at 08:21 AM.
08-26-2015, 08:34 AM   #5
Veteran Member




Join Date: May 2014
Photos: Gallery
Posts: 803
QuoteOriginally posted by DeadJohn Quote
I often follow these steps when adjusting exposure in Lightroom. My K-5 probably isn't as ISO invariant as the A7RII, but I can push shadows a lot, avoiding the extra processing and often overprocessed look of HDR.

1) Adjust the exposure slider if the photo is ridiculously underexposed (or overexposed).
2) Adjust the white point slider while holding down Alt to see clipped highlights.
3) Adjust the black point slider while holding down Alt to see clipped shadows.
4) Adjust shadow and highlight sliders if the scene calls for it.
pretty much what I do. and I always tend to underexpose my images, I like how it looks and develops better,
08-27-2015, 10:13 AM   #6
Senior Member
Krusty Surfer's Avatar

Join Date: Oct 2014
Posts: 119
good stuff here
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
exposure, invariance and pp, iso, iso invariance, photography, photoshop, pp, pp possibilities
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
High ISO on purpose? Or simulate using PP? MSL Photographic Technique 15 02-10-2014 03:53 PM
High ISO vs. PP GeneV Digital Processing, Software, and Printing 21 07-31-2011 08:29 AM
PP Competition #13: High iso processing. pcarfan Mini-Challenges, Games, and Photo Stories 23 01-02-2010 10:43 AM
Lucky Brown Show 3200 ISO min PP metroeloise Post Your Photos! 4 05-24-2009 08:49 PM
ISO 3200! Only PP in lightroom metroeloise Post Your Photos! 3 12-12-2008 07:25 PM



All times are GMT -7. The time now is 05:09 AM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top