"William Sommerwerck" wrote in message
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"Dave Plowman (News)" wrote in message
...
In article , Arfa Daily
wrote:

Contrary to what you believe about the phosphors on CRTs, I don't
believe that there has been any significant change in their colour
rendition capabilities since the earliest delta gun tubes in the uk,
which I worked with from about 1970

Oh, but there was. The original delta gun shadow mask tubes used the
correct NTSC phosphors. Which gave a pretty pure red. The rot really came
in with PIL tubes which used a very 'orange' red phosphor simply because
it allowed a brighter picture. And that had real implications to flesh
tones. Took many years before that was corrected.

I would almost bet my life that this is absolutely backwards -- it was the
original phosphors that were orangish, improving only with the rare-earth
phosphors of the early '60s. (I remember Sylvania's radio ads.)

In fact, I'm pretty certain that most of what's being posted about color
TV
and color analysis/reproduction is utter bilge. But I don't have a
comprehensive understanding of this material (it's not easy), so I'm
pretty
much keeping my mouth shut.



What I said about non-spectral colours, and the inability of a tri colour
CRT to genuinely reproduce them, is not bilge though - see the link that I
posted earlier in the thread, refering to this.

Arfa