Re: EIZO ColorNavigator and G7 validation
Re: EIZO ColorNavigator and G7 validation
- Subject: Re: EIZO ColorNavigator and G7 validation
- From: Dan Reid <email@hidden>
- Date: Sat, 07 Feb 2009 16:56:00 -0700
- Thread-topic: EIZO ColorNavigator and G7 validation
on 2/7/09 3:02 AM, Klaus Karcher at email@hidden wrote:
> Todd Shirley wrote:
>> I've always known that
>> cyan can't be accurately produced on a monitor so it makes me wonder
>> what the point of this validation routine is.
>
> I guess the point is to make one feel like buying one of those fancy new
> wide-gamut displays ;-)
>
>> It also makes me wonder
>> how soft proofing systems can be "certified" to GRACoL
>> (http://www.swop.org/certification/monitorList.asp ). I guess cyan and
>> cyan heavy greens don't matter?
>
> AFAIK the tolerance for primaries and secondaries is Delta E 2000 < 7.
>
>> Anybody else try to validate to GRACoL? Is my monitor way out of line?
>
> max Delta E > 20 seems to be somewhat high to me, but Delta E's > 10 are
> quite usual on "normal"-Gamut displays. I get DE76 =15.8 / DE00 = 6.3
> for 100% Cyan on an EIZO CG210.
>
> Klaus Karcher
>
I did the test again using D50 instead of D65, L*, 140 cd/m2 on my Eizo
CG241W.
The 100% cyan dropped from 12.5 CIE76 in D65 white point to 1.8 CIE76 when
calibrated to D50 instead of D65. The worst patch, 100% yellow, measured 5.5
CIE76 but was an acceptable 1.4 CIE2000 visually. This validation was done
with the default ColorNavigator preferences.
Switching the measurement device's compensation table to "none" in the
ColorNavigator preferences resulted in an improvement in match to GRACoL
data. The worst patch, green overprint (100,0,100,0), measured 3.7 CIE76
(1.3 CIE2000). The blue overprint (100,100,0,0) measured 3.1 CIE76 (2.0
CIE2000).
So it definitely looks like calibrating a Eizo CG241 for D50 instead of D65
is better if you want to proof GRACoL data. Switching the Eizo
ColorNavigator measurement device's compensation setting preference to none
for validation improves the supposed accuracy to GRACoL data.
I also tried increasing the contrast ratio too. When I increased the
illuminance from 140 cd/m2 to 180 cd/m2 the 100% yellow patch dropped
another 0.50 CIE76 but the next worst patch dropped below 3.0 CEI76.
So cranking up the contrast ratio (dynamic range) of the monitor helps too.
--
Dan B. Reid
RPimaging, INC
Color Management Products and Training for Print, Internet, and Motion
Graphics
http://www.rpimaging.com | Toll Free: (866) RGB-CMYK
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