[opendtv] Re: New Chips Improve Color TV Dramatically
- From: "John Willkie" <johnwillkie@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Wed, 30 Jun 2004 07:03:36 -0700
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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