[opendtv] Re: New Chips Improve Color TV Dramatically
- From: cliff benham <cbenham@xxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Mon, 05 Jul 2004 11:37:44 -0400
The only light in the room was from the CT-100.
Don McCroskey wrote:
>The reason why receiver manufacturers quickly abandoned the NTSC green
>phosphor was because of low screen brightness compared to the
>yellow-green phosphors used since the mid-50's. The continued search
>for an NTSC green phosphor with the desired light output has been
>unsuccessful AFAIK. I would guess that Cliff was viewing the CT-100
>in comparatively dark surroundings.
>
>Don McCroskey
>
>-----Original Message-----
>From: opendtv-bounce@xxxxxxxxxxxxx
>[mailto:opendtv-bounce@xxxxxxxxxxxxx] On Behalf Of John Willkie
>Sent: Wednesday, June 30, 2004 7:01 AM
>To: opendtv@xxxxxxxxxxxxx
>Subject: [opendtv] Re: New Chips Improve Color TV Dramatically
>
>Is it still as difficult to acquire the rare-earth green phosphors as
>it once was (the reason I've always heard for using less-vivid green
>phosphors?)
>
>John Willkie
>
>-----Original Message-----
>From: opendtv-bounce@xxxxxxxxxxxxx
>[mailto:opendtv-bounce@xxxxxxxxxxxxx]On Behalf Of cliff benham
>Sent: Tuesday, June 29, 2004 7:15 PM
>To: opendtv@xxxxxxxxxxxxx
>Subject: [opendtv] Re: New Chips Improve Color TV Dramatically
>
>
>Last summer, I saw NTSC pictures on a restored, properly adjusted
>CT-100, the very first RCA color set and the only "TV Set" ever built
>with an unequal bandwidth I-Q decoder and a 15GP22 CRT, the only CRT
>ever to employ the original NTSC phosphors.
>Next to it was a properly adjusted 12 inch (Sony Trinitron CRT)
>Tektronix 650 color monitor. The source material was transferred film
>and video on DVD.
>
>The RCA had much darker, richer greens than the TEK, and produced a
>subjectively more pleasing color picture than the TEK.
>The RCA pictures had a very different look than the TEK and were more
>preferable to me. The TEK produced yellowish greens.
>If all the decoding and phosphor coordinates are so close, why did
>they look so different?
>
>Doug McDonald wrote:
>
>
>
>>--- Alan Roberts <roberts.mugswell@xxxxxxxxxxxxxx>
>>wrote:
>>
>>
>>
>>
>>>Mark, we all agree that they are near identical.
>>>
>>>
>>>
>>>
>>I do not agree. The blues are near identical.
>>
>>The reds are very close.
>>
>>The greens except the original NTSC (and Adobe RGB) green are very
>>close. The original NTSC is wildly different from all the others
>>(except Adobe RBG), and is wildly inferior. The NTSC green is green,
>>the other are a rather sickly yellow green.
>>
>>And my eye is pretty well calibrated from decades of staring at pure,
>>
>>
>
>
>
>>monochromatic, at the edge of the CIE diagram, lasers. I can tell
>>
>>
>with
>
>
>>10 nm the wavelength of any color, and within 3 nm for the 555-620
>>
>>
>nm,
>
>
>>just by looking. This gives some idea of what a trained person can do
>>
>>
>
>
>
>>at the edge of the chart. Inside, while I can do pretty well at the
>>dominant wavelength, I have no good ability to tell saturation ...
>>especially in the blue-green.
>>
>>Doug McDonald
>>
>>
>>=====
>>Doug McDonald
>>my last name at scs dot uiuc dot edu, not here at Yahoo, please
>>
>>
>
>
>
>
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