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the last word

Photography meets digital computer technology. Photography wins -- most of the time.

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Testing for ETTR, part 8

December 7, 2012 JimK Leave a Comment

In a comment to this post, a reader asked me to compare the ad hoc color balance adjustment technique that I developed a few days ago with the UniWB technique. I’d not been aware of that approach. It turns out the goal is the same: to get the in-camera histogram to approximate the true raw… [Read More]

The Last Word

ETTR testing, part 7

December 6, 2012 JimK Leave a Comment

I’ve tested the D4 in other lighting conditions, with other subjects, with success so far. I’ve also attempted correcting the Sony NEX-7 using the same technique. The correction turned out to be remarkably similar (or maybe not remarkable; Nikon uses mostly Sony chips in their best cameras) to the D4: 5000K, +6G. The NEX-7 color… [Read More]

The Last Word

ETTR — the return of the spotmeter?

December 5, 2012 JimK 1 Comment

From the mailbag: With a hint and some assistance from George Jardine, I finally figured out how to optimize exposure (ETTR). The key was George’s statement that he spot metered for the highest significant tone, and placed it just under clipping. As you have found, the histogram lies and matrix, evaluative, center weighted metering is… [Read More]

The Last Word

Testing for ETTR, part 6

December 5, 2012 JimK 3 Comments

I’m pretty happy with the image settings I came up with to make the D4 in-camera histogram approximate the real raw histogram. Using those settings, however, means not having the convenience of the D4’s exemplary automatic white balance. I guess I’ll use it with fixed white balance  when I really care about getting the ultimate… [Read More]

The Last Word

Testing for ETTR, part 5

December 5, 2012 JimK Leave a Comment

Well, I just spent the whole afternoon on this, but I’ve now got a set of settings for the D4 that give a pretty good approximation to the real raw histogram. The white balance was the problem. Here’s my reasoning; I’m not sure of it yet, but it seems to make sense so far. The… [Read More]

The Last Word

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Articles

  • About
    • Patents and papers about color
    • Who am I?
  • How to…
    • Backing up photographic images
    • How to change email providers
    • How to shoot slanted edge images for me
  • Lens screening testing
    • Equipment and Software
    • Examples
      • Bad and OK 200-600 at 600
      • Excellent 180-400 zoom
      • Fair 14-30mm zoom
      • Good 100-200 mm MF zoom
      • Good 100-400 zoom
      • Good 100mm lens on P1 P45+
      • Good 120mm MF lens
      • Good 18mm FF lens
      • Good 24-105 mm FF lens
      • Good 24-70 FF zoom
      • Good 35 mm FF lens
      • Good 35-70 MF lens
      • Good 60 mm lens on IQ3-100
      • Good 63 mm MF lens
      • Good 65 mm FF lens
      • Good 85 mm FF lens
      • Good and bad 25mm FF lenses
      • Good zoom at 24 mm
      • Marginal 18mm lens
      • Marginal 35mm FF lens
      • Mildly problematic 55 mm FF lens
      • OK 16-35mm zoom
      • OK 60mm lens on P1 P45+
      • OK Sony 600mm f/4
      • Pretty good 16-35 FF zoom
      • Pretty good 90mm FF lens
      • Problematic 400 mm FF lens
      • Tilted 20 mm f/1.8 FF lens
      • Tilted 30 mm MF lens
      • Tilted 50 mm FF lens
      • Two 15mm FF lenses
    • Found a problem – now what?
    • Goals for this test
    • Minimum target distances
      • MFT
      • APS-C
      • Full frame
      • Small medium format
    • Printable Siemens Star targets
    • Target size on sensor
      • MFT
      • APS-C
      • Full frame
      • Small medium format
    • Test instructions — postproduction
    • Test instructions — reading the images
    • Test instructions – capture
    • Theory of the test
    • What’s wrong with conventional lens screening?
  • Previsualization heresy
  • Privacy Policy
  • Recommended photographic web sites
  • Using in-camera histograms for ETTR
    • Acknowledgments
    • Why ETTR?
    • Normal in-camera histograms
    • Image processing for in-camera histograms
    • Making the in-camera histogram closely represent the raw histogram
    • Shortcuts to UniWB
    • Preparing for monitor-based UniWB
    • A one-step UniWB procedure
    • The math behind the one-step method
    • Iteration using Newton’s Method

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