Re: Eizo Calibration/basICColor with GAMMA L*
Re: Eizo Calibration/basICColor with GAMMA L*
- Subject: Re: Eizo Calibration/basICColor with GAMMA L*
- From: Andrew Rodney <email@hidden>
- Date: Tue, 17 May 2005 16:56:08 -0600
On 5/17/05 3:55 PM, "Marco Ugolini" wrote:
> When it comes to measuring a display's white point, it does not matter what
> the luminance is, or the contrast, or what profile is driving the display:
> the white point remains the same.
Not quite. The white point is a measure of the color of white. We can try
and define it, adjust to some white point we prefer etc. With LCDs one
usually measures it and since there isn't anything we can really do to
adjust it (at least "physically" as we could with a CRT), we leave it alone
and record what it is. The luminance is how bright this is but it's separate
from the color of white. So a display at 120 cd/m2 versus one at 110 cd/m2
is the intensity separate from the color. Does this mean that as one changes
the intensity, the white point might change? I guess it could be that's not
something we need to be concerned with since the profiling software should
be looking for and recording these values.
> Or are we talking here of an uncalibrated and unprofiled white point such as
> what appears at the beginning of a calibration/profiling routine? (That
> would be the "native" white point, I guess, with perfectly linear LUT curves
> in the vcgt tab)
The term Native white point is usually used to describe the white point of
the display "as is". In many software products, setting this is saying
"record the white point, leave it alone since (with an LCD) there isn't
anything we can really do with it). Of course you can ask the software to
attempt to calibrate to a CCT like 6500K or better an actual color such as
D65 and an adjustment has to take place, usually at the graphic card which
many want to avoid.
Andrew Rodney
www.digitaldog.net
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