Re: BasICColor and "vcgt" tag
Re: BasICColor and "vcgt" tag
- Subject: Re: BasICColor and "vcgt" tag
- From: bruce fraser <email@hidden>
- Date: Fri, 20 May 2005 08:28:48 -0700
At 11:03 AM +0200 5/20/05, Karl Koch wrote:
basICColor display uses a unique technique in
calibrating monitors. If you have a
"hardware-calibratable" monitor like the EIZO
CG21, display will first measure the tonal
response curve, calculate a correction curve and
load it into the monitor. Then display measures
the corrected values again and iterates until
the deltaE values are as small as possible.
In the case of the CG21, display can only do a
tonal response correction, not a gray balance in
the hardware of the monitor, since the CG21 has
only 1 LUT for all three channels, R,G and B.
The successor, CG210, has 3 LUTs.
If display detects only one LUT, it corrects the
gray balance on the graphics card, in addition
to the tonal response calibration in the
monitor. If it detects 3 LUTs in the monitor,
you will see a straight line in the vcgt and
thus in your video card.
So, it´s not a bug, it´s a feature! basICColor
display generates the most accurate calibration
possible.
I found that my CG21 always had a pink cast until
I used BasICColor. I'd tried Color Navigator with
both the i1 colorimeter and spectro, I'd tried
calibrating with Color Navigator then using
Monaco OPTIX to build the profile, and various
other combinations, but whatever I tried the CG21
was always pink compared to the Arisan sitting
beside it. BasICColor wth the X-Rite instrument
nailed it first try.
It is indeed a feature, and a good one!
--
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