the last word

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

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B&W Permanence

December 30, 2002 By JimK Leave a Comment

Last time I wrote about improving color image permanence through digital imaging. I wish I could report similar good news for black and white. Our standards are higher for black and white images, since we the standard techniques yield images with prospective lifetimes measured in triple digits. Much of the slower progress for black and… [Read More]

Permanence

September 30, 2002 By JimK Leave a Comment

Some photographs ought not to last. I’ve made my share. How convenient it would be if they slowly faded away to nothingness. I’m in good company: when Edward Weston decided that he didn’t like some formerly-loved images, he scraped the emulsion off the negatives and turned them into windowpanes. I bet he wanted the prints… [Read More]

Obsolesence

June 30, 2002 By JimK Leave a Comment

Measured against the standards of the times, photography has always been a high-tech activity. Practice even preceded science in the early days: photography predates the periodic table by thirty years. As in other technology-based endeavors, over the years practitioners of the art have become more and more dependent on others for their technology. In the… [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
  • 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 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 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 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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Archives

Unless otherwise noted, all images copyright Jim Kasson.