When Roger sent me these graphs, I noticed the presence of red in the green
(and the other "mixed" primaries also). This has the effect of reducing the
gamut by bringing the green towards the red, which is what you would do to
reduce an Adobe RGB compliant display to a sRGB or something similar.
If you compute the xy coordinates without the red peak (by putting
everything larger than 580 nm at zero) you obtain (0.1840, 0.6863)
which is much closer to the Adobe RGB green primary (0.21, 0.71).
This monitor may well have been preset to sRGB but we do not have this info.
Maybe others which have access to such a beast can confirm.
Danny Pascale
email@hidden
www.babelcolor.com
----- Original Message -----
From: "Klaus Karcher" <email@hidden>
To: "colorsync-users" <email@hidden>
Sent: Tuesday, December 18, 2007 11:15 AM
Subject: Re: LED displays: some comments and observations.
Roger Breton wrote:
I had the opportunity to use my EyeOnePro to measure the spectra of a
Samsung XL24 along with those of the Eizo CG301W and CG241W during GATF's
CMS Conference in Phoenix two weeks ago. For those interested, the files
are
available for download here:
I included spectrum images and spectrum data files exported from
BabelColor's CT&A and an Excel file that combine the three primaries and
the
white plotted with Excel's default smoothing (Danny would object).
With hindsight, I realize I should have done those measurements a little
more carefully but I find them nevertheless useful for getting some idea
of
what to expect from LED vs CCFL LCD technologies.
Seeing that both displays are advertised as "wide gamut", I am
disappointed: when I compare the primaries (and calculated secondaries)
with those of my CG210, I don't see any improvements in green or red --
only the gamut in the blue (and therefore also the cyan and magenta)
region seems to be larger -- but I ask myself how much of it will be left
when they are calibrated to D50.
On the other hand: when I compare EIZO's profiles for the CG241W using a
3D viewer like <http://iccviw.de>, its gamut looks /much/ bigger in the
green, red and cyan region.
I'm confused. Are you sure you measured the native primaries?
(I took the profiles for the XL20/XL24 from Samsung's Windows "drivers"
with a pinch of salt -- their gamut is tiny, it seems to me that they are
only valid for some kind of sRGB emulation mode ;-)
Klaus
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