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

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Archives for October 2019

Camera resolution and 4K viewing — a7S, a7III, a7RIII, a7RIV

October 18, 2019 JimK 2 Comments

This is the seventh in a series of posts on the effect of camera resolution on the quality of downsampled images. The series starts here. I’m beginning to see then end of this series of posts, and am beginning to mentally write the conclusions section, but there are a couple more things I’d like to… [Read More]

The Last Word

Camera resolution and 4K viewing — natural images, QImage downsampling

October 17, 2019 JimK 4 Comments

This is the sixth in a series of posts on the effect of camera resolution on the quality of downsampled images. The series starts here. In the first post in this series, I used Lightroom to process images of a Siemens Star, in an attempt to find out how well the superior image quality of a… [Read More]

The Last Word

Camera resolution and 4K viewing — downsampling algorithms

October 16, 2019 JimK 14 Comments

This is the fifth in a series of posts on the effect of camera resolution on the quality of downsampled images. The series starts here. In the first post in this series, I used Lightroom to process images of a Siemens Star, in an attempt to find out how well the superior image quality of a… [Read More]

The Last Word

Camera resolution and 4K viewing — real world images 2

October 16, 2019 JimK 1 Comment

This is the fourth in a series of posts on the effect of camera resolution on the quality of downsampled images. The series starts here. In the first post in this series, I used Lightroom to process images of a Siemens Star, in an attempt to find out how well the superior image quality of… [Read More]

The Last Word

Camera resolution and 4K viewing — real world images 1

October 16, 2019 JimK Leave a Comment

This is the third in a series of posts on the effect of camera resolution on the quality of downsampled images. The series starts here. In the first post in this series, I used Lightroom to process images of a Siemens Star, in an attempt to find out how well the superior image quality of… [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

Category List

Recent Comments

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