[opendtv] Re: 4KTV at CES
- From: "TLM" <TLM@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Sat, 20 Apr 2013 18:51:18 -0700
If you think rigorous,there needs to be a "reference black" and "reference
white" for D to which we calibrate.
Where is the screen? Where are the actors typillaly placed in 3-space? Can
subtitles be at "negative D"? What would SMPTE say?
Don't laugh. I once sat with a producer who once wanted it to look
"happier". When we re-labeled a knob happier he was happy.
-----Original Message-----
From: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx] On
Behalf Of TLM
Sent: Saturday, April 20, 2013 5:48 PM
To: opendtv@xxxxxxxxxxxxx
Subject: [opendtv] Re: 4KTV at CES
In my experience, the phosphors do lag differently, Some times three
greenish the most. Being an old guy I appreciate that (if I remember)).
Green was always slow.
But I think it worth a shot at understanding what happens with accumulating
electrons in a single contemporary cell with which we intend to creative
intent. Is it just RGB? Or is it RGBD (where D is depth)?
-----Original Message-----
From: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx] On
Behalf Of Richard C. Ramsden
Sent: Saturday, April 20, 2013 5:25 PM
To: opendtv@xxxxxxxxxxxxx
Subject: [opendtv] Re: 4KTV at CES
Phosphor lag is entrenched in FCC rules. There is no pixel to pixel black
to white transition. It takes several pixels to cover a complete
transition. Color to color is just as bad.
Similarly, there is no true white or black. Blue, green, or red for that
matter. Range is limited to 15 to 240, out of 1 to 254. I can understand
why to restrict 0 and 255.
CRTs are rapidly being scrapped, but we are still saddled with their legacy.
At least for broadcast standards, blurred edges will be here until the FCC
stops caring about CRTs.
Rich
On 4/20/2013 6:48 PM, John Shutt wrote:
> Why would phosphor lag cause a pixel to smear horizontally? It would
> make it glow when the next frame required complete darkness, that's
> all. Any smearing of a pixel dot would be due to a misfocused
> electron beam.
>
> The perceived resolution of the B&W CRT would be highest due to there
> being no shadow mask blocking part of the electron beam, allowing a
> lower powered and sharper focused beam to produce the same brightness
> as a higher powered and less focused electron beam in a color CRT.
> Also, with a color CRT you have three electron beams for the three
> colors, so any registration error will adversely impact the image
> quality.
>
> For my money, the lack of registration error is what makes a
> plasma/LCD TV superior to an equivalent CRT.
>
> John
>
> ----- Original Message ----- From: "TLM" <TLM@xxxxxxxxxx>
> To: <opendtv@xxxxxxxxxxxxx>
> Sent: Tuesday, April 16, 2013 6:58 PM
> Subject: [opendtv] Re: 4KTV at CES
>
>
>> Something I've always wondered about but have no real information
>> on: the
>> differences in perceived H and V resolution between a B&W CRT (the
>> image is smeared horizontally perhaps due to phosphor decay lag?),
>> the RGB triads in early color CRTs (depending on how those little RGB
>> tried are packed and the fact that green has the most energy, but
>> still smeared horizontally, right?), what changes then with the
>> vertical "wires" in the Trinitron, how that changes again with all of
>> the different flavors of flat panel triplets (most of which are
>> rectilinear I believe, right?), shuttered more or less simultaneously
>> (what are the difference refresh characteristics of OLEDs, plasmas
>> and LCDs?), in the latter case - since those triplets are now little
>> rectangles - is there any perceivable difference in resolution when
>> you turn your head (or the display) 90 degrees?
>
>
>
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