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the last word

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

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Archives for 2016

How do adaptation errors add?

January 17, 2016 JimK Leave a Comment

This is the nineteenth in a series of posts on color reproduction. The series starts here. You don’t have to read the whole thing if you don’t want to. I’ll try to make this post reasonably self-contained. If you get confused, reading the series from the beginning may be useful. In the previous post in… [Read More]

The Last Word

Some more color images of the hills across the way

January 16, 2016 JimK 1 Comment

I’m not driving since I’m tapering off the Keppra, so the only pictures I can make are still from around the house. Here are a few color ones.   The weather this month has been fantastic for this kind of photography.

The Last Word

Zeiss Loxia 21mm f/2.8, part 2

January 15, 2016 JimK 1 Comment

This is a continuation of the Loxia review that starts here. I took a walk this morning with my new lens on the a7RII. Here’s a distortion test, first with Lightroom’s lens corrections turned off: There’s just a little mustache distortion. With lens correction on: The distortion pretty much goes away. Here’s an image with… [Read More]

The Last Word

Zeiss Loxia 21mm f/2.8, part 1

January 15, 2016 JimK 1 Comment

On Wednesday, the big brown truck brought a Zeiss Loxia 21mm f/2.8 lens for the Sony alpha 7x cameras that I’d ordered on announcement day back in October. I tore into the package like it was Christmas. No pouch, which is OK with me, since I use the Domke wraps or climbing chalk bags, and… [Read More]

The Last Word

Macbeth CC, Illuminants, & output color spaces

January 11, 2016 JimK Leave a Comment

This is the eighteenth in a series of posts on color reproduction. The series starts here. You don’t have to read the whole thing if you don’t want to. I’ll try to make this post reasonably self-contained. If you get confused, reading the series from the beginning may be useful. Warning. This post assumes a… [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

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