|Jim Worthey • Lighting & Color
Research • email@example.com
• 301-977-3551 • 11 Rye Court, Gaithersburg, MD
Imaging Conference 16
Tuesday, 2008 November
11, 1:30 - 3:30 pm
Instructor will be Jim Worthey
The 2007 tutorial (CIC 15)
occurred with 10 Students, who kindly posed for a class picture.
Below the picture is information for 2008.
For the full jpeg
from the camera, right-click this link
When the right color matching functions (CMFs) are used,
vector methods demystify camera sensors, lighting, and
other topics. In Jozef Cohen’s invariant formulation, the
vectors of spectral lights at unit power define the “locus
of unit monochromats” (LUM). Orthonormal opponent CMFs map
lights into Cohen’s color space and establish intuitive
axes: whiteness, red-green, and blue-yellow. If a camera’s
LUM matches the eye’s, it meets Luther’s criterion. The
instructor presented details at CIC12 and CIC 14. The
course emphasizes the practical use of color vectors and
the orthonormal CMFs. If you plan to bring a computer to
the course, please install a VRML viewer prior to
attending. For background, see below.
Benefits: This course will enable the attendee to
- Use the orthonormal CMFs, and calculate color vectors.
- Understand the Locus of Unit Monochromats and the
role of vector amplitude.
- Work with 3D plots of such data as color chips under
a lighting change.
- Compare light sources on the basis of vectorial
- Generate a camera’s orthonormal basis, and compare it
to the eye’s. The algorithm is simple, then
understanding may take a little time.
Intended audience: Scientists and engineers who design or apply
camera systems or lights. While certain applications
will be stressed, the vectorial approach applies to all
color work. For example, multi-primary systems and image
compression are natural applications.
|James Worthey received a BS
in EE and an MS in Physics, then a PhD in Physiological
Optics from Indiana University. He researched lighting and
color at the National Institute of Standards and Technology,
and published several applications of opponent colors. A
breakthrough came in 2003 when he combined opponent colors
with Cohen’s ideas and computer graphics.
VRML viewer: If you are
considering the tutorial, or just want to browse this web site, it
will be helpful to install the Cortona VRML Viewer, so you can
view the 3-dimensional graphs:
- Click this link: http://www.cortona3d.com/
- Click the button that says VIEWERS.
- Then install a 3D viewer as appropriate.
- The Cortona (Parallel Graphics) web site apparently detects
your browser. So, to install for different browsers, you need to
start over, using the target browser to contact the web site.
- As far as I know, there are versions for different Windows
browsers, and also for Apple.
- If you will bring a computer to the tutorial, please install
the viewer on it.
- If you have any issue about VRML viewers, please send
email or call 1-301-977-3551 in the USA, or call by Skype
- For more info, you can try http://cic.nist.gov/vrml/vbdetect.html
. But please feel free to contact me, because I am interested to
know about your problem, and I may be able to help. Or, if you
are a VRML expert, you can teach me.
¡See you in Portland!
(The 2008 Portland meeting is past. But the
short course can be done with a small or large audience almost
- Update in 2013:
Worthey, "Vectorial color," Color Research and
Worthey, "Applications of vectorial color,"
Research and Application, 37(6):410-423
to Dr. Michael H. Brill, there is also a poem commenting
on that article, "Applications of vectorial color:"
Michael H. Brill, “Fit-first to be tied,” Color Research
and Application, 37(6):423 (December 2012).
- Obtain the
articles above through normal channels, or please contact the
- Draft article "Vectorial
Color," and the Figures to go with it.
- Paper as
presented at Color Imaging Conference 12: Color
Matching with Amplitude not Left Out . Concise
introduction to color vectors.
- The visuals for CIC 12,
which include animated and 3D graphs.
- Paper as presented at Color Imaging Conference
14 in 2006: Camera Design Using Locus
of Unit Monochromats .
study a few of the key ideas, separated from the larger
discussion, check out the Questions
- The tutorial
is intended to teach the practical use of vectorial ideas.
Therefore, you might want to look at the Computer Programming Examples.
- For total
practicality, see the tabulation of the orthonormal
- After the
tutorial, you may be interested in the set of 5 worked
- For some
detailed ideas on lighting and color--perhaps after the
tutorial--see the graphical materials on How White
Light Works, or the short proceedings paper
on that topic.
- Class notes.
(A pdf file, suitable for viewing or printing.)
- Visuals for
the oral presentation. (Similar to class notes, but
with some 3D and animated graphs. )
Jim Worthey Home Page: http://www.jimworthey.com
|Copyright © 2007
James A. Worthey, email: firstname.lastname@example.org
Page last modified, 2014 June 12, 16:00