Unfortunately, a bad idea that looks good never dies.
That said, I still think that it is an interesting challenge
to create this graph by programming. I can imagine that if
you specified the coordinates at a certain number of points
in the interior and along the spectrum locus, you could use
an interpolation algorithm, to reproduce what is on the
wikipedia page. Of course, I'm kicking myself for encouraging
this be done given the opportunity it provides for misguidance
and misrepresentation.
Ken
Quoting Bryan Hanson <han...@depauw.edu>:
I am, unfortunately, well-aware of the limitations that Ken points
out (and I do appreciate him making these points). One can readily
demonstrate the gamut limitations by printing the diagram Ishida
links to on different devices. My hope is to get something close
and include a disclaimer. Bryan
On Mar 18, 2013, at 7:08 AM, Ken Knoblauch <ken.knobla...@inserm.fr> wrote:
ishi soichi <soichi777 <at> gmail.com> writes:
Has anyone plotted or is it possible to plot
CIE *xy* chromaticity diagram
http://en.wikipedia.org/wiki/File:CIE1931xy_blank.svg
I need this plot in color.
ishida
<sermon>
And following up on my previous mail (diatribe), after
having contemplated the image at the link that you
provide, there is another significant distortion to take
into account in the representation that you propose.
Suppose that you are considering the appearance of
isolated, centrally viewed lights in isolation, in neutral
adaptation by an observer whose vision corresponds to
the average observer of CIE1931. Then, the set of primaries
that you will be using to generate those colors (on a screen
or on paper) will have a gamut that excludes a significant
portion of the diagram, so that if you take this limited gamut
and stretch it out to fill the diagram, then the coordinates of
the colors indicated will deviate significantly from the positions
in which they are represented (not to even speak of their
appearance). So, in general, while this leads to a pretty
diagram, there is a lot of potential for misunderstanding
in such a (mis)representation. </sermon>
--
Kenneth Knoblauch
Inserm U846
Stem-cell and Brain Research Institute
Department of Integrative Neurosciences
18 avenue du Doyen Lépine
69500 Bron
France
tel: +33 (0)4 72 91 34 77
fax: +33 (0)4 72 91 34 61
portable: +33 (0)6 84 10 64 10
http://www.sbri.fr/members/kenneth-knoblauch.html
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--
Kenneth Knoblauch
Inserm U846
Stem-cell and Brain Research Institute
Department of Integrative Neurosciences
18 avenue du Doyen Lépine
69500 Bron
France
tel: +33 (0)4 72 91 34 77
fax: +33 (0)4 72 91 34 61
portable: +33 (0)6 84 10 64 10
http://www.sbri.fr/members/kenneth-knoblauch.html
______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
