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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 19

December 24, 2012 JimK Leave a Comment

I’ve figured out why I couldn’t get either the D4 or the D800E to white balance to the screen shots. It was pure cockpit error on my part. I misread the manuals for both cameras, which are virtually identical with respect to white balancing. I thought you could get the camera to compute and store… [Read More]

The Last Word

Matboard for Exhibition Fiber

December 22, 2012 JimK Leave a Comment

I’m starting to print for the In Motion exhibition which opens at the Center for Photographic Art in March. I usually print the images from the Staccato series on Epson Exhibition Fiber paper. I’ve been looking for matboard that matches the paper for more than a year without success; everything I’ve tried has looked yellow… [Read More]

The Last Word

Testing for ETTR, part 18

December 20, 2012 JimK Leave a Comment

The UniWB technique I’ve been developing worked fine on an M9. Coefficients +/- 3%.

The Last Word

Testing for ETTR, part 17

December 17, 2012 JimK Leave a Comment

Raw histogram calibration for the Nikon D800E I have good news and bad news. The good news. The UniWB calibration procedure I’ve been working on went swimmingly with the 800E. The whole thing took five or six minutes (I’ve been doing this a lot, so I’m faster than the average bear). Four exposures, three Rawdigger… [Read More]

The Last Word

Testing for ETTR, part 16

December 16, 2012 JimK Leave a Comment

This is a continuation of analyzing the process variables involved in doing UniWB from an LCD monitor with only Rawdigger and Photoshop as the software tools involved. This post is statistical, technical, and nerdy. It is presented in the spirit of giving the interested reader to tools to replicate what I’m doing. If you’re just… [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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