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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 4

December 5, 2012 JimK Leave a Comment

In an attempt to find a set of D4 picture settings that made the in-camera histogram look like the true raw histogram, I set the contrast to minimum, the brightness to minimum, and the saturation down one click from standard. It helped, but it wasn’t enough. The test image: The in-camera histogram, used to find… [Read More]

The Last Word

Testing for ETTR, part 3

December 5, 2012 JimK Leave a Comment

Now let’s turn things around, and see what we get for a true raw histogram when we set the exposure so that the in-camera histogram is just short of clipping, which occurs at a shutter speed 1 2/3 stops faster than the metered exposure, and a full stop faster than the correct ETTR exposure. The… [Read More]

The Last Word

Testing for ETTR, part 2

December 5, 2012 JimK Leave a Comment

In the previous post, we saw that, with standard settings the D4 shows minor clipping in its true raw histogram at the metered exposure for a moderate contrast subject, even though the in-camera histogram looks clipped at that exposure. In this post, I will show what happens when you find the correct ETTR exposure by… [Read More]

The Last Word

Testing for ETTR, part 1

December 5, 2012 JimK Leave a Comment

[This is the first in a looong series of posts on the topic. If you want to skip the evolution of my ideas and go right for the conclusions, click here.] Conventional wisdom among camera users, especially if people taking pictures with cellphones count as camera users, is that JPEG is plenty good enough, and… [Read More]

The Last Word

Looking at true raw histograms

December 4, 2012 JimK Leave a Comment

If you want to follow along with me as I explore the world of true raw histograms — defined as histograms in the native color space of the sensor — you’re going to need a a program you probably don’t have. The one I suggest is called Rawdigger. Point your web browser here, and download… [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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