Jim Worthey, Lighting and Color Research
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Jim Worthey • Lighting & Color Research • jim@jimworthey.com • 301-977-3551 • 11 Rye Court, Gaithersburg, MD 20878-1901, USA

"Camera Design Using Locus of Unit Monochromats"
James A. Worthey & Michael H. Brill
Color Imaging Conference 14
Scottsdale, AZ
2006 Nov. 9, 3:45 pm

There are materials required for the conference, and some additional detailed examples. Here are links:
  1. Proceedings paper, "Camera Design Using Locus of Unit Monochromats," 6 pages.
  2. The 2 slides for the 2-minute talk.
  3. The text of the 2-minute talk.
  4. Poster itself, Camera Design Using Locus of Unit Monochromats . The algorithm in the poster is improved from the one in the proceedings.
  5. Supplementary material, web only: 5 "further examples" . The utility of the method lies in its ability to reveal differences between sensor designs. In these examples, 5 different sensor sets are examined, and the results are given in detail, including a 3D picture of the Locus of Unit Monochromats for each case.

Background materials include:
  1. Proceedings paper from Color Imaging Conference 12 by Jim Worthey: Color Matching with Amplitude Not Left Out .
  2. Visual presentation for the CIC 12 paper. A long web page was used, rather than slides. Animated graphics clarify old and new ideas, and 3D graphics show the Locus of Unit monochromats and some uses of Cohen's space. Visuals from CIC 12 .
  3. As yet unpublished manuscript evolved from the CIC 12 talk. The figures are in a separate pdf:
    1. Vectorial Color .
    2. Figures for "Vectorial Color" .
  4. The CIC 12 talk showed the application of vectorial ideas to color rendering. A white light comprises narrow bands of different wavelengths. Based on human color-matching, each narrow band maps to a tristimulus vector, and those vectors add to give the tristimulus vector of the white light. In 2006 February, Jim Worthey gave a talk on color rendering with detailed examples:
    1. Proceedings paper: "How White Light Works" .
    2. A long web page with links to detailed examples supplies the visuals of "How White Light Works" . This link will take you to the same visuals but jump over background material and right into the color rendering presentation.
    3. If you are designing color copiers, notice that the newest paper (CIC 14) shows how to generate the orthonormal basis and locus of unit monochromats for a set of electronic sensors. From there, the vectorial approach to color rendering can be applied to see how the copier's light source works with the sensors.
  5. For more general background material, there is James A. Worthey, "Color rendering: asking the question," Color Research and Application 28(6):403-412, December 2003:
    1. Preprint of the text for "Color rendering: asking the question" .
    2. A separate pdf containing figures for "Color rendering: asking the question" .
    3. An illustrated list of 30 New Ideas for Color Rendering.
  6. For a new theorem and a review of prime colors: Michael H. Brill and James A. Worthey, "Color Matching Functions When One Primary Wavelength is Changed," Color Research and Application, in press. (This article was accepted for publication in 2006 May. There's a preprint!)
  7. The proceedings paper says "The results above relate color mixing to the vector space of a camera’s sensor functions, expressed by the LUM. The sensors also affect a camera’s signal-to-noise properties in a way that the LUM does not predict. In toying with the idea of anomalous color vision, Fig. 10 was generated. ..." Toying with anomalous color vision did not lead to a published article, but some ideas were recorded in an unpublished Samizdat which you can read:  Normal and Anomalous Color Vision.
  8. For ever more material about lighting and color, see the home page:  http://www.jimworthey.com .

Copyright © 2006 James A. Worthey, email: jim@jimworthey.com
Page last modified, 2007 September 10, 18:48