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

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March 6, 2011 JimK Leave a Comment

If a personal computer is a computer that you have all to yourself, my first personal computer was a Hewlett-Packard 2114, which was assigned to me in 1970 when I was working at hp. It came with a form of onsite service; if anything broke, I’d either swap the new part in myself or call… [Read More]

Technical, The Bleeding Edge

Getting more RAM, part 3

March 4, 2011 JimK 4 Comments

With the Lenovo D20 looking like it could be too loud, I reduced the list of possibilities to the hp Z800 and the Dell T7500. The hp workstation wins the design competition: nearly everything snaps together and requires no tools to access – it’s actually a step ahead of the Mac Pro, and the Mac… [Read More]

Technical, The Bleeding Edge

Computer sound levels

March 3, 2011 JimK Leave a Comment

In the last post, I said that having a quiet machine was an objective of mine. Measuring acoustic levels is tricky if you want valid comparisons across manufacturers and models. Fortunately, there is an internationally standardized test procedure for computers and workstations, ISO 9296. Unfortunately, it’s difficult for prospective computer buyers to get the numbers…. [Read More]

Technical, The Bleeding Edge

Getting more RAM, part 1

March 2, 2011 JimK 1 Comment

In 1955, C. Northcote Parkinson proclaimed an adage, which is now stated: work expands to fill the time available for its completion. Parkinson ’s Law has many corollaries. I have recently run into one: computer memory usage expands to fill the available RAM. Two years ago, I upgraded my computer hardware to gain more memory,… [Read More]

Technical, The Bleeding Edge

2880 vs 1440 dpi printing

February 22, 2011 JimK Leave a Comment

Since there doesn’t seem to be much of a difference in image quality between the 2880/1440 dpi and the 1440/720 dpi settings on the Epson 3880 driver, I’m confused about why both exist. Having three different ink drop sizes in 1440/720 mode results in print times about half of those printed with the higher-resolution setting,… [Read More]

Technical

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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

  • bob lozano on The 16-Bit Fallacy: Why More Isn’t Always Better in Medium Format Cameras
  • JimK on Goldilocks and the three flashes
  • DC Wedding Photographer on Goldilocks and the three flashes
  • Wedding Photographer in DC on The 16-Bit Fallacy: Why More Isn’t Always Better in Medium Format Cameras
  • JimK on Fujifilm GFX 100S II precision
  • Renjie Zhu on Fujifilm GFX 100S II precision
  • JimK on Fuji 20-35/4 landscape field curvature at 23mm vs 23/4 GF
  • Ivo de Man on Fuji 20-35/4 landscape field curvature at 23mm vs 23/4 GF
  • JimK on Fuji 20-35/4 landscape field curvature at 23mm vs 23/4 GF
  • JimK on Fuji 20-35/4 landscape field curvature at 23mm vs 23/4 GF

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Unless otherwise noted, all images copyright Jim Kasson.