the last word

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

  • site home
  • blog home
  • galleries
  • contact
  • underwater
  • the bleeding edge
You are here: Home / The Last Word / Gelling the light source for better balance in B&W scanning

Gelling the light source for better balance in B&W scanning

July 17, 2022 JimK Leave a Comment

With light sources anywhere near D50, when scanning B&W negatives or positives, the green raw channels saturates well before the red and blue ones. It occurred to me that gelling the light source might even this out, and give me a higher SNR in the scans. I ordered a Rosco Minus Green #247 gel filter to experiment with.

The green and blue channels are now well matched, and the red is improved.

The Last Word

← You’re an old photographer if you can remember… Lightroom sharpening of Leica Q2 Monochrom files →

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

April 2024
S M T W T F S
 123456
78910111213
14151617181920
21222324252627
282930  
« Mar    

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

  • JimK on Pentax 645 120/4 smc FA macro on GFX 100S at 1:1
  • Corey on Pentax 645 120/4 smc FA macro on GFX 100S at 1:1
  • JimK on Fuji 20-35/4 vs 32-64/4 landscape field curvature
  • kes cirdes on Fuji 20-35/4 vs 32-64/4 landscape field curvature
  • JaapD on Artificial intelligence and camera firmware
  • Anthony on GFX 100 II, X2D — blur and distortion with IBIS and ES
  • Barry Goyette on Using InDesign to lay out an exhibition
  • JimK on Nikon 135 Plena OOF PSFs
  • h on Nikon 135 Plena OOF PSFs
  • JimK on Hasselblad XCD 38/2.5 on X2D 100C MTF50

Archives

Copyright © 2024 · Daily Dish Pro On Genesis Framework · WordPress · Log in

Unless otherwise noted, all images copyright Jim Kasson.