Re: Eizo CG241W vs. NEC 2690 SpectraView
Re: Eizo CG241W vs. NEC 2690 SpectraView
- Subject: Re: Eizo CG241W vs. NEC 2690 SpectraView
- From: William Hollingworth <email@hidden>
- Date: Tue, 27 Nov 2007 13:00:09 -0600
At 02:02 PM 11/25/2007, email@hidden wrote:
> On 11/23/07 9:45 PM, "Chris Murphy" wrote:
>
>> 2490 and LED do. But not the 2690, so the white point is a bit off
>> which you can compensate for. It's not off by much.
>
> Isn't the 2490 the sRGB unit and the 2690 the wide gamut (93%)?
Correct. 93% of Adobe RGB (1998), whatever that means. And the LED is
108% of Adobe RGB (1998), again whatever that means.
To clarify what this means, since there is a lot of confusion about
this in the industry (intentional or not):
The de facto standard when throwing around display gamut sizes is
currently to quote the gamut area, calculated in CIE xy, relative to
a reference gamut and expressed as a percentage. If the reference
color gamut is unspecified, it is generally assumed to be NTSC (1953)
- (which is pretty useless since it's not in use and makes things
more confusing, especially for those doing video work).
Another confusing point about this figure is that it does not say
what portion of the 2 gamuts overlap, so it would be possible to have
a very large % gamut area, but only have a smaller portion of it
actually covering the reference gamut.
At NEC we have started to quote 2 sets of figures: "Percent Area" and
"Percent Coverage".
The "Percent Area" is simply the area in CIE xy of the display gamut
vs the reference gamut, with no consideration of how much of the
gamuts actually overlap. This value can be > 100%.
The "Percent Coverage" is the overlapping area of the 2 gamuts
expressed as a percent of the total area of the reference gamut. The
maximum possible value for this is 100%.
We generally quote these values for AdobeRGB and sRGB, so it is
easier to determine which color gamut best suits a particular application.
Using CIE xy is not ideal because it overemphasizes the greens and
under emphasizes the blues. A much better way would be to use CIE u'
v', but that would probably cause more confusion and make direct
comparisons even more difficult.
Will Hollingworth
Manager of OEM Product Design & Development Engineering
NEC Display Solutions of America, Inc.
http://www.necdisplay.com
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