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the last word

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

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Archives for February 2016

Does Lr export color space matter in Macbeth testing?

February 4, 2016 JimK 2 Comments

This is the 33rd in a series of posts on color reproduction. The series starts here. There are a few loose ends in this Macbeth chart analysis work. One is: does the color space used to export the test image from the raw developer make a difference?  We already know that it does in the… [Read More]

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Capture 1 vs Lr ASP default color processing

February 3, 2016 JimK 5 Comments

This is the 32nd in a series of posts on color reproduction. The series starts here. It’s been a long, long road, but I’m finally ready to address the question that started this serial discourse on color reproduction, to wit: “What are the differences between Capture 1 and Lightroom default color conversions of Sony a7RII… [Read More]

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Some more color hills images

February 3, 2016 JimK 1 Comment

Yesterday and today, I developed a few color images of the hills near my house.from exposures made in the past two weeks.  

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Macbeth testing with auto-exposure

February 2, 2016 JimK Leave a Comment

This is the 31st in a series of posts on color reproduction. The series starts here. We have seen that, with nonlinear profiles, Macbeth color accuracy can be affected by exposure. The purpose of this post is to explore the utility of the automatic exposure systems that are built into modern cameras as a tool… [Read More]

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Macbeth light dimming effects

February 2, 2016 JimK Leave a Comment

This is the 30th in a series of posts on color reproduction. The series starts here. In some of the testing I’ve been doing, I’ve been varying the intensity of the Westcott LED panels that I’ve been using, and expecting the spectrum of the lights to not change materially. Is that a good assumption? I… [Read More]

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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

Category List

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