On Dec 2, 2011, at 8:35 AM, Chris Crawford wrote:
> NEC's Spectraview colorimeter doesn't give accurate profiles with non-NEC
> monitors and software; it is a little different than the regular i1
> Display II device.
Thanks, Chris. Very cogent. NEC says their Spectraview puck will work with
regular software, but just to be sure I also used the original puck from before
my Spectraview days. No discernible difference.
> You can't change the CIE xy values, they are the actual color of the
> screen's red, blue, and green pixels. Accurate measurement of them is
> important to making a profile. Monitor calibration is actually two
> separate things. Calibration has you adjust the screen's brightness,
> contrast, and color to as close as it can get to the ideal, then a profile
> is made by measuring the actual values the monitor is producing and
> creating an ICC profile that tells color managed software like Photoshop
> how the screen displays color, so it can adjust the display of images to
> compensate for the slight inaccuracy in the calibration or deficiencies in
> the screen's color gamut.
This I didn't know. The i1 software does have a drop-donj menu that has
several temperature settings, as well as Native, and XY. When you hit XY it
brings up two sliders.I was thinking about setting the sliders for the NEC's xy
values on the MacBook Pro just to see what happens. It's not like i can't
profile again right away. <g> I have noticed that their's a minor glitch in the
software that wants to profile the NEC with the same software used to profile
the MBP. That ain't gonna happen, but it does leave me annoying messages.
> You'll never get the laptop screen to match your NEC screen. The NEC has
> internal lookup tables that allow it to adjust its white point with no
> loss of color gamut, unlike most LCDs, which really cannot change their
> white point (CRTs can, but LCDs cannot because of how they display
> color...the backlight in an LCD is a certain color temperature and you're
> kinds stuck with that on most LCDs).
I figured I wouldn't get them to match just because of the NEC's internal
stuff, but I'd like to get them closer than they are. But, that said, maybe the
actual output won't be as far off as the screens look. I confess I haven't
tried processing a file all the way with just the laptop.
> I believe xrite's software requires you to manually change the screen
> brightness during the calibration steps, it doesn't do it automatically.
> That is probably why your screen is coming out too bright.
It does, and I have, and I get it close, but then even if I profile again
within a few minutes the laptops luminance has bounced back up to nearly 160,
or at least that's what it says. Maybe I'll talk with Apple about this before
my 90 days for free support is up. <g>
Thanks again,
--Bob
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