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I'm going by the chart that was on the stand next to the display at
CES. In that one, the green primary was left enough that it cut off
part of the standard gamut.
Indeed if every primary was outside the specified gamut, it would be
possible to calibrate them to the appropriate colors by mixing in a
little of the other primaries to shift them (as we can do now on
current Samsung DLP's with the CCA mode in the service menus). But,
if the green primary was where it was on the chart, there would be no
way to get it to the right place.
Hopefully TI is right, Samsung is wrong with regard to what I saw at
CES.
On Jan 11, 2006, at 5:17 PM, Brad J Krehbiel wrote:
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>
>
> Steve,
> I read T.I.'s white paper on this technology (see the PDF
> attachment on the
> first post at this site:
>
http://www.satelliteguys.us/showthread.php?t=51368 ). It's very
> interesting, but I'm wondering about your comments re: the color
> gamut. On
> page 4 of the white paper, there is a color gamut chart for the LED
> light
> source that shows it completely surrounding the Rec. 709 color
> gamut on the
> chart. I'm a layman with respect to these charts, so please bear
> with me,
> but doesn't that mean it can reproduce any HDTV color?
>
> With respect to your other concern about "colors not seen in video,"
> wouldn't that be a non-issue, also, as it would only output colors
> in the
> input signal?
>
> No disrespect intended, I'm just trying to learn!
>
> Brad
>
> Brad Krehbiel, PE
> Crown Center Redevelopment Corp.
> Phone: 816-274-8564
> Fax: 816-274-4567
>
>
>
> Steve Martin
> <steve@planomarti
>
> ns.com> To
> Sent by: "HDTV "HDTV Magazine"
> Magazine"
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> Subject
> Re: Samsung LED light source
> for
> 01/11/2006 04:51 DLP
> PM
>
>
> Please respond to
> "HDTV Magazine"
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>
> My disappointment with this technology was that they are boasting a
> "130% larger color gamut" than normal televisions. What that means
> is that 30% of the colors it displays are not in the NTSC (or HD)
> specified color space and are therefore not colors that you are
> supposed to see in video. The problem seems to be a very odd green
> primary, probably limited by the color that can be generated from an
> LED light. It is worse in that it looks like about 10% of the
> correct colorspace is not even covered by their "130%" so there is
> much in the yellow/green area that they can not reproduce. Hopefully
> in the future they will be able to improve the green color produced
> by the LED, but then they would lose their "130% larger color gamut"
> marketing material so it looks like we may be in store for another
> round of inaccurate color reproduction.
>
> It certainly appeared bright enough (although the grayscale on the
> Samsung demo was glaringly blue so who knows what the output would be
> like if you balanced it). I'm guessing the red may be on the dim
> side and an accurate grayscale would require reducing the green/blue
> and hence the total light output quite a bit. (All conjecture at this
> point, I'm such a pessimist!).
>
> Other than that, the lack of color wheel artifacts was very welcome.
>
> On Jan 11, 2006, at 4:15 PM, Marvin Munster wrote:
>
>> ----- HDTV Magazine Tips List -----
>>
>> Hello everyone. Just back from CES. Did anyone see the Samsung
>> LED DLP light source? I found it quite interesting. Almost as
>> bright as the light bulb/color wheel type DLP. No more color wheel
>> and they are clamming that the light source will last up to 20,000
>> hours. Very impressive. The did not mention how much it would
>> cost to replace the LED's when they go down.
>>
>> Any comments?
>>
>> Marvin.
>>
>>
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> Steve Martin
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