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bennyuz
What's DOS?
Posts: 1
Registered: ‎01-16-2014
Location: israel
Views: 2,417
Message 1 of 11

color gamut on the new w540

hi,

 

i wanted to ask please what is the color gamut on the new w540 ips 3k screen, the adobe rgb and the srgb please,

 

thenk u very much and all the best benny.

damonlynch
Token Ring
Posts: 70
Registered: ‎12-08-2009
Location: US
Views: 2,344
Message 2 of 11

Re: color gamut on the new w540

I'd also like to know the gamut for the 1080p panel. Given it's mentioned nowhere in the marketing material, I fear it may have regressed compared to the previous generations. Hopefully not!

gusat
HDMI
Posts: 235
Registered: ‎10-21-2012
Location: Switzerland
Views: 2,338
Message 3 of 11

Re: color gamut on the new w540

"color gamut on the new w540 ips 3k screen, the adobe rgb"

This is matter of the backlight type in use. On IPS panels a quasi-100% aRGB is possible and cost-effective today with GB-r-LED and 8b+FRC. Hence, the answer lies mainly in the backlight type - which one may find in the specs.
rhodeswarrior
Serial Port
Posts: 22
Registered: ‎01-16-2014
Location: Australia
Views: 2,121
Message 4 of 11

Re: color gamut on the new w540


@bennyuz wrote:

hi,

 

i wanted to ask please what is the color gamut on the new w540 ips 3k screen, the adobe rgb and the srgb please,

 

thenk u very much and all the best benny.


 

Hi,

 

I ran some tests using Datacolor Spyder 4, the display isn't a wide color gamut screen (96% of sRGB and 73% of AdobeRGB). Display Gamma is 2,1

When setting the screen to 100% brightness it measured 344 cd/m2 - the specifications are 350 cd/m2, so that's about right. Contrast is 610:1

Have you seen the review of the W540 at notebookcheck ? They ran extensive tests of the display.

 

Hope this helps...

 

 

 

 

 

 

 

 

 

Guru
Posts: 9,598
Registered: ‎12-26-2009
Location: CA
Views: 2,078
Message 5 of 11

Re: color gamut on the new w540

Well that's a bit disappointing. The older panels had 95% AdobeRGB coverage.

W520: 2960XM, Q2000M @ 1091/1380, 32GB RAM, 500GB&750GB HDD & 500GB SSD, FHD&MB168B+
X61T: L7500, 4GB RAM, 500GB HDD, XGA screen, Ultrabase
W550s: 5600U, K620M at 1164/1281, 16GB RAM, 512GB SSD, 3K touchscreen
X200s: SL9400, 6GB RAM, 64GB SD card, WXGA+ screen
TPT1: 1839-23U
ibmthink
Bit Torrent
Posts: 638
Registered: ‎10-21-2011
Location: DE
Views: 2,075
Message 6 of 11

Re: color gamut on the new w540

But the older panels weren´t IPS - it is a tradeoff-game: If you choose IPS, you can´t have the 95 % gammut unless you choose a 10bit panel like the HP dreamcolor displays - but then, you will loose Optimus and have a limited choice of screens/resolutions (the Dreamcolor displays are still only FHD).

Puppy
Bit Torrent
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Registered: ‎11-28-2007
Location: CZ
Views: 2,065
Message 7 of 11

Re: color gamut on the new w540


@ColonelONeill wrote:
Well that's a bit disappointing. The older panels had 95% AdobeRGB coverage.

Older panels were TN crap so the so-called "color gamut" was a marketing nonsense number valid only in lab environment (1mm above the each pixel) but never in real life.

 

You can find real measured values in these reviews

http://www.notebookcheck.net/Review-Lenovo-ThinkPad-W540-Workstation.112318.0.html

http://www.notebookcheck.net/Review-Lenovo-ThinkPad-W530-N1K43GE-Notebook.80062.0.html

 

You can not expect a "pro" display quality of a notebook display because of missing backlight uniformity compensation (NEC and Eizo monitors only).

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qwerty42
Token Ring
Posts: 30
Registered: ‎04-12-2012
Location: USA
Views: 2,043
Message 8 of 11

Re: color gamut on the new w540

Puppy, I disagree.

 

Yes, they were TN panels, which have the obvious limitation of viewing angle, but the color gamut was definitely not a marketing nonsense number, and I don't know what you mean by it only being valid "1 mm above each pixel." No, it's not a professional Eizo or NEC display, but compared to most other laptop displays out there, it is vastly superior in terms of color reproduction for image editing, when properly calibrated. The built-in calibrator that came with the W520 and W530 was definitely garbage (and I don't mean kinda junky, I mean completely useless), but if you used a decent external hardware calibrator it could give some pretty impressive results for a notebook LCD.

 

If you don't believe me, here is a sample profile verification snippet from my own W520. For a laptop, it's excellent:  http://i45.tinypic.com/ix6uee.jpg Also, the color gamut associated with that same color profile had 91% coverage of AdobeRGB, and total gamut volume was 103% of AdobeRGB. Those are my own measured values, not laboratory nonsense. If you want to see gamut plots, I can show you those too.

 

I'm guessing notebookcheck didn't like the W530 display because they were testing it with the built-in calibrator. Like I said above, that thing was worse than useless. It literally made the screen more 'off' than the stock, default sRGB profile.

Guru
Posts: 9,598
Registered: ‎12-26-2009
Location: CA
Views: 2,042
Message 9 of 11

Re: color gamut on the new w540


@Puppy wrote:

@ColonelONeill wrote:
Well that's a bit disappointing. The older panels had 95% AdobeRGB coverage.

Older panels were TN crap so the so-called "color gamut" was a marketing nonsense number valid only in lab environment (1mm above the each pixel) but never in real life.

 

You can find real measured values in these reviews

http://www.notebookcheck.net/Review-Lenovo-ThinkPad-W540-Workstation.112318.0.html

http://www.notebookcheck.net/Review-Lenovo-ThinkPad-W530-N1K43GE-Notebook.80062.0.html

 

You can not expect a "pro" display quality of a notebook display because of missing backlight uniformity compensation (NEC and Eizo monitors only).


TN does not necessarily equal bad. As far as I've used the W520 FHD panel, viewing angles have never really been an issue. Relative color accuracy does change with different viewing orientation, but the range of colors emitted by the screen is essentially invariant.

Color gamut is a function of backlight spectra, which can be measured more or less independently of LCD style by checking with the panel set to fully transparent (i.e. full white). This means that the orientations of the liquid crystals will not significantly affect color gamut, and hence nor will viewing angle.

 

Further, why couldn't one simply attach the old backlight to the new IPS panel? IPS transmittivity issues aside, it should give the best of both worlds.


W520: 2960XM, Q2000M @ 1091/1380, 32GB RAM, 500GB&750GB HDD & 500GB SSD, FHD&MB168B+
X61T: L7500, 4GB RAM, 500GB HDD, XGA screen, Ultrabase
W550s: 5600U, K620M at 1164/1281, 16GB RAM, 512GB SSD, 3K touchscreen
X200s: SL9400, 6GB RAM, 64GB SD card, WXGA+ screen
TPT1: 1839-23U
Guru
Posts: 7,626
Registered: ‎11-23-2007
Location: USA
Views: 2,006
Message 10 of 11

Re: color gamut on the new w540

Swapping a backlight - be it LED or CCFL - is not for the faint at heart and always carries a significant risk of destroying the panel by introducing dust specs within its layers.

 

It's unfortunate that we couldn't get "new" IPS screens combined with the "old" keyboard/trackpoint, but such is life I guess...

Cheers,

George




In daily use: R60F, R500F, T61, T410

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Non-ThinkPads: Panasonic CF-31 & CF-52, HP 8760W




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