NEC 2690WUXi - can it handle regular sRGB?

Started Oct 1, 2007 | Discussions thread
Will49 Regular Member • Posts: 225
Re: Calibration to sRGB in aRGB mode possible?

Graystar wrote:

Review of the spec and features show that only sRGB is
built into the monitor, which would be in line with the 8-bit
display.

Again the bit depth has nothing to do with the monitor gamut being
sRGB or ARGB. You could make a 4 or 16 bit monitor with ARGB coverage.

And again, where do you see me saying that the bit depth is limiting,
or equating, or relating to the gamut??

Well when you say:

"A 16.7 million color limitation makes the monitor an 8-bit monitor. Review of the spec and features show that only sRGB is built into the monitor, which would be in line with the 8-bit display. So you’re either in sRGB mode or you’re not (exactly like high end CRTs.) That makes it an sRGB monitor."

So my interpretation of what you are saying, and I think that of others reading this is:
a) This is an 8 bit monitor because it only accepts 8 bit video inputs
b) Only having an 8 bit input makes this an "sRGB" monitor.

Apologies if this interpretation is not what you intended.

The problem here is that you’ve taken my comments out of their
intended context. You didn’t follow the previous trail of posts that
led to these comments, which was as a response to someone who believe
that the workings of this monitor is related to the aRGB standard.
My point, which you totally missed so I’ll reword, is that the aRGB
standard is a 16-bit standard.

The only time bit depth appears in the ARGB spec is relating to image encoding which has nothing to do with how many bits are sent to the display (which is not defined as part of the spec). The encoding spec for ARGB allows for 8 and 16 bits.

If you want to work in that standard
then you must shuttle around 16-bit color information. However,
there is no 16-bit color processing going on, or even any way to get
16-bit color information from an image that Photoshop is trying to
display, to the display itself.

So by your logic only a display with a 16 bit input is capable of being an "ARGB" display.

Again there is nothing in the ARGB spec about bit depth other than for encoding.

The set of standards that comprise
the Adobe RGB color set isn’t used in any way, shape, or form within
this monitor or any of its processing.

It is correct to say the display does not do any gamut processing to try and fit it's gamut into that of ARGB (which it can't entirely because it is smaller than that of ARGB in the green).

However, the ARGB spec defines (among other things)
a) White Point of D65
b) Gamma of 2.2
c) Red, Green and Blue color primaries

When a display is calibrated, a) and b) are taken care of using the monitor's processing and LUTs. The display's color primaries form the color gamut which in the case of the LCD2690 is slightly smaller than that of the ARGB spec. This is where the 93% value comes in. The CMS will take care of c), mapping ARGB into the display's actual gamut by the use of the ICC profile.

This monitor will only accept 8-bit data per color channel as input
on the DVI connection, as per the DVI specification. As far as I can
tell there is no DVI-dual link mode to get greater color information
to this monitor. The bit depth limits the number of colors in the
displayable palette. If you want to display a different set of 16.7
million colors from the available 69 billion, then you have to change
the palette. But I never said that the monitor doesn’t really have
69 billion colors and that those colors don’t cover 93% of the aRGB
gamut...of course it does.

If what I’ve just said is incorrect then I’ll be more than happy to
read and accept your explanation of how you can get an LCD2690WUXi to
accept 10 or 12 bit color data from the OS, and have an active
palette of greater than 16.7 million colors.

What you stated above is correct.

It is important for everyone to understand that the "palette of 16.7M out of 69 billion" does not change the range or gamut of the display when using 1D LUTs. The palette and LUTs are used to choose the optimal 16.7M levels when making tone corrections (i.e. white point and gamma corrections) to reduce or eliminate color banding which you would otherwise get in a 8 bit x 8 bit LUT system.

So you’re either in sRGB mode or you’re not (exactly like
high end CRTs.) That makes it an sRGB monitor. Which is really all
it can be, because unless you have a special video card designed to
output 10 bit color, all regular video cards expect to connect to
sRGB devices.

Again totally incorrect. The video card has absolutely nothing to do
with the gamut of the monitor. Video cards don't "expect" to be
connected to any specific gamut of monitor.

And again, and again and again where do you see me saying that the
gamut is limited by anything?? I don’t even see the word “gamut” in
my quote!

Well when someone refers to a monitor as being sRGB, ARGB or whatever, they are referring to the color gamut. OK you didn't use the word "gamut", but that is what is inferred.

You have GOT to learn how to read!! You’re just filling in all this
stuff from your head! First of all, where do I mention bit depth in
that quote?? I didn’t say bit depth increased the gamut. CRTs can
divide up the gamut they have into more than 16.7 million choices
because they’re analog...they simply process the voltage levels that
are given to them. That’s what technologies such as Matrox Gigacolor
and ATI’s Avivo do. These graphic cards can output 10 bit data on a
DVI dual link (which the LCD2180WG-LED would like) or a regular
analog signal with more finely divided voltage levels, thus expanding
the palette to a billion colors. But palette does not equal gamut,
which is something you seem to think I keep saying.

OK thank you for the clarification.

-- hide signature --

Will Hollingworth
Manager of OEM Product Design & Development Engineering
NEC Display Solutions of America, Inc.

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