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the last word

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

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Lightroom memory use vs file size

September 7, 2014 JimK 1 Comment

On a forum that I frequent, a poster made the assertion that Lightroom memory usage was not so much a matter of the number of pixels in the image, but of the number of bytes in the file. That didn’t make any sense to me. I figured that Lr, like Photoshop, would decompress any file… [Read More]

The Last Word

Some clouds that never were

September 6, 2014 JimK Leave a Comment

Also in preparation for this weekend’s presentation, I found a slit-scan image that I’d liked previously.  Since I told myself that I was only going to take fresh work, I looked it it with new eyes, and found something that I liked: Too romantic?

The Last Word

Another slit-scan sunset

September 6, 2014 JimK Leave a Comment

While I was looking for the slit-scan sunset of yesterday’s and the day before’s post, I found one that I’d never printed: Here’s what it took to make it work: No Matlab work required. Also, note that I didn’t create that place in the center of the image where the sun brightened up.

The Last Word

Tweaking the slit-scan sunset image

September 5, 2014 JimK Leave a Comment

I managed to restore the fog to the lower left corner of the sunset image in the last post. When I edited the first version, I used a Photoshop plug-in called Contrast Master to give the clouds some sock and pull up the details in the dark areas. That plug-in in no longer installed on… [Read More]

The Last Word

Matlab meets a new slit-scan image

September 4, 2014 JimK Leave a Comment

I’m working on material for a presentation this weekend — more on that in a future post — and I decided to print this slit-scan sunset image: But when I looked at it closely, I saw some artifacts near the horizon: I figured the Matlab one-dimensional averaging code that I created for the succulents pictures… [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
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      • Two 15mm FF lenses
    • Found a problem – now what?
    • Goals for this test
    • Minimum target distances
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      • Small medium format
    • Printable Siemens Star targets
    • Target size on sensor
      • MFT
      • APS-C
      • Full frame
      • Small medium format
    • Test instructions — postproduction
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    • 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

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