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Hudechrome
Hudechrome
Known Participant
December 29, 2011
Answered

Color Spaces CIE and Adobe RGB

  • December 29, 2011
  • 2 replies
  • 38467 views

Looking at monitor specs, usually, the color space of the monitor is given in terms of a target color space, like 96% Adobe RGB. Some give several, but along comes Dell, u2412, and they supply one: 82% CIE.

I know what CIE is, but making a guesstimate from the Dell spec requires more than what I presently know about such matters.

So, what are the expectations? Is that a meaningful spec for comparison sake? IOW, how much does Adobe RGB enclose CIE 1976?

TIA

Lawrence

This topic has been closed for replies.
Correct answer D Fosse

Here it is. Check the spec tab

http://accessories.us.dell.com/sna/productdetail.aspx?c=us&cs=04&l=en&sku=320-2676

"(the CIE and ICC lists should get a laugh out of it)"

Just so long as it doesn't degenerate into that brouhaha you and Murphy had with that fellow calibrating for video a few months back. I'm on that list and really enjoyed lurking, although I actually e-mailed the fellow and looked at his website.

Still don't know what set him off so.


From TFT Central:

The U2412M uses White-LED (W-LED) backlighting. The colour space of this screen is approximately equal to the sRGB reference and is considered a 'standard gamut' backlight type. Studying the detailed panel spec confirms the screen covers 71% of the NTSC reference, 74.3% of the Adobe RGB reference and 95.8% of the sRGB space. As a side note you will see reference on Dell's website of an 82% colour gamut. This refers to the NTSC coverage but is based on a different reference point (CIE1976 = 82%). More common is the CIE1931 standard which would equate to 72% NTSC which is more relevant when comparing with other screens quoting NTSC gamut specs. While a 95.8% coverage of the sRGB space is decent enough and in line with most W-LED backlit screens, some higher end uses may require a wider gamut with a full 100% sRGB coverage (and beyond) for graphics and colour work. A wide gamut screen is another option for those wanting to work outside of the sRGB colour space.

http://www.tftcentral.co.uk/reviews/dell_u2412m.htm

2 replies

B
Bogdan Hlevca
Participant
October 1, 2021

The selected "correct" answer is wrong.  Please read the article at this link: monitor color gamuts 

 

For your conveneince I paste here the relevant part:

sRGB, AdobeRGB, NTSC, and CIE 1976
To quantify how many colors a device can handle, it uses one of the standardized color gamuts that define a particular range of colors. The most common of the RGB-based color gamuts is sRGB. This is the typical color gamut used for computer displays, TVs, cameras, video recorders, and related consumer electronics. It's one of the oldest and narrowest of the color gamuts used for computer and consumer electronics.

AdobeRGB was developed by Adobe as a color gamut to provide a wider range of colors than sRGB. The purpose was to give professionals a greater level of color when they work on graphics and photos before converting for print. The wider AdobeRGB gamut gives a better translation of colors to print than sRGB.

NTSC is the color space developed for the range of colors that can be represented to the human eye. It's also the only representative of the perceived colors that humans can see and isn't the widest color gamut possible. Many may think this has to do with the television standard that it's named after, but it's not. Most real-world devices to date can't reach this level of color in a display.

The last of the color gamuts that may be referenced in LCD monitor color ability is the CIE 1976. The CIE color spaces were one of the first ways to define mathematically specific colors. The 1976 version of this is a specific color space that charts the performance of other color spaces. It's generally fairly narrow and, as a result, is one that many companies use, as it tends to have a higher percentage number than the others.

To quantify the various color gamuts in terms of the relative range of color from narrowest to widest would be CIE 1976 < sRGB < AdobeRGB < NTSC. In general, displays are compared to the NTSC color standard unless stated otherwise.
Chris Cox
Chris Cox
Legend
December 30, 2011

CIE is a standards body.  There isn't really a CIE colorspace (well, there are many that have different names and don't apply to monitors).

So I'm not sure what they're referring to.

    Hudechrome
    HudechromeAuthor
    Known Participant
    December 30, 2011

    Exactly. That's whay it's confusing.

    I believe they are referring to this:

    http://hyperphysics.phy-astr.gsu.edu/hbase/vision/cie1976.html

    Hudechrome
    HudechromeAuthor
    Known Participant
    January 6, 2012

    One aspect I haven't gotten around to (missing my usual roundtuit on my desk lately!) is what exactly (or approx, if that's all there is) does my Epson 3800 cover? So I started a search and instantly, some work done by Eric Chan showed up:

    http://people.csail.mit.edu/ericchan/dp/Epson3800/gamuts.html

    Not only does he use the 3800, he also has a monitor which does not cover aRGB, but sRGB.

    The conclusions are interesting, along with his methodology. I realize it's 3 years old but then, so's my 3800!

    So D Fosse is philosophically right on.

    You guys are saving me bux!


    I took delivery of a Dell (gulp!) 2410 today, and after getting the calibrator up and running, I have to say it's much better than I ever expected.

    No, it's not a Lacie or certainly not Eizo, but the essential characteristic for which I searched, beetter separation in the shadows, is there. Reminds me of the first time I used Plus -X. It was so linear.

    For $400 expidited delivery, it's a bargain.

    Av dE, 0.4, max dE, 1.47

    Thanks again for all the feedback.

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