[opendtv] Re: New Chips Improve Color TV Dramatically

I am worn out by this thread.  Here is a URL to a paper by, among 
others, Bernice Rogowitz of IBM, whose color work is wonderful.  It has 
references to perceptual colormaps:
http://people.brandeis.edu/~aron/published/which_traject.pdf

Enjoy!

TTFN,
Mark


John Willkie wrote:

>Call me dumb, and in need of "visual display of quantitive information."
>(cobbed from the title of E. Tufte's book).  Is a perceptually constant
>scale quadrille graph paper, or is it mapped to some other set of
>coordinates?  Can it be shown in two dimensional space? (like the CIE chart
>does badly, I've always been told)  Does perceptually constant imply some
>type of log or other complex scales?  Is the scale best represented by dots
>of a single color, or is there something better?
>
>I've always been able to say that I had a "rather good" technical
>understanding of radio TV broadcasting, with the exception of colorimetry.
>The problem might be genetic:  my father, a Navy electronics tech, used to
>repair neighbor's TV sets until color came about and dealing with color was
>beyond his ken.
>
>John Willkie
>
>-----Original Message-----
>From: opendtv-bounce@xxxxxxxxxxxxx
>[mailto:opendtv-bounce@xxxxxxxxxxxxx]On Behalf Of Mark Schubin
>Sent: Tuesday, June 29, 2004 8:50 PM
>To: opendtv@xxxxxxxxxxxxx
>Subject: [opendtv] Re: New Chips Improve Color TV Dramatically
>
>
>With a perceptually constant scale.
>
>TTFN,
>Mark
>
>
>John Willkie wrote:
>
>  
>
>>What is a good way to prove that they're close, Mark?
>>
>>John Willkie
>>
>>-----Original Message-----
>>From: opendtv-bounce@xxxxxxxxxxxxx
>>[mailto:opendtv-bounce@xxxxxxxxxxxxx]On Behalf Of Mark Schubin
>>Sent: Tuesday, June 29, 2004 2:37 PM
>>To: opendtv@xxxxxxxxxxxxx
>>Subject: [opendtv] Re: New Chips Improve Color TV Dramatically
>>
>>
>>I'm not sure there's much more value in pursuing this, but I'll take one
>>final crack.  If, on a scale of tens of millions of years, I plot the
>>rise and demise of dinosaurs, that's pretty common.  If, on the same
>>scale, I plot the birth of every person on this list, they will all
>>occupy a point at essentially the same coordinate.  But we were not all
>>born at the same time.
>>
>>Similarly, the CIE x,y coordinates are useful for many purposes but are
>>not ideal for identifying perceptually different color primaries.  Once
>>again, I agree that the primaries being discussed ARE perceptually very
>>close (I was involved in some of the standardization).  I simply point
>>out that the x,y coordinates are not a way to prove that they are close,
>>any more than a geological time scale is good for differentiating my
>>birth date from yours.
>>
>>TTFN,
>>Mark
>>
>>
>>Alan Roberts wrote:
>>
>>
>>
>>    
>>
>>>Sorry, Mark, but elementary colour science does just that, as I explained.
>>>In any chromaticity space, those primaries are near identical sets. The
>>>table of numbers is only that, a table of numbers, but they represent
>>>colours which when plotted in any sensible chromaticity diagram or colour
>>>difference diagram, will show that they are darn near identical. Semantics
>>>can't get you away from that obvious conclusion.
>>>
>>>
>>>      
>>>
>>
>>
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