Re: EIZO ColorNavigator and G7 validation
Re: EIZO ColorNavigator and G7 validation
- Subject: Re: EIZO ColorNavigator and G7 validation
- From: Steve Miller <email@hidden>
- Date: Thu, 12 Feb 2009 09:10:50 -0600
- Thread-topic: EIZO ColorNavigator and G7 validation
It's been my experience that if I set the white pt. to D50, the display does
not look neutral and has a yellow cast.
I have been measuring the paper white of a G7 proof lit by my GTI viewing
booth (with new lamps) with my DTP94. The proof has a paper white DE of .28
compared to GRACoL 7 specs. I measure the viewing conditions and adjust the
brightness of the booth until I get a 120 cd/m2 reading. My display and my
viewing booth are in a dimly lit room. Because the room has dim ambient
lighting, I haven't used the 160cd/m2 spec. When using this method, I end up
with a color temperature of 5500K. Using color navigator I calibrate and
profile the Eizo CG19 display. The results when validating to Gracol 7 are
DE2000 Max 6.3, Ave 1.5, white pt. 1.0. If I use colornavigator to adjust
the white pt. after calibrating and profiling. I can get the white pt. DE
down even lower. I adjust the white pt. until it visually matches the white
pt. of my proof. After adjusting the white pt. ColorNavigator re-profiles
the display. With this method I have a very good match to my GRACoL 7 proof
visually and by the numbers. As good as my display gamut will allow.
Any feed back on this method would be appreciated. Am I way out to lunch or
does this method sound like a good procedure?
Thanks,
Steve
On 2/11/09 6:47 PM, "Roger" <email@hidden> wrote:
> Hello Todd,
>
> As Marco pointed out, ISO-3664 mandates D65 when viewing images in isolation.
> But when viewing images side by side with a desktop viewing booth, D50 is the
> standard, as described in ISO-12646. I realize many list members, over the
> years, have reported good visual matches between their monitors and images
> viewed in their desktop viewing booth at D65, but that has not been my
> personal experience. This needs D50.
>
> Roger Breton
>
>> Todd Shirley wrote:
>>
>>> If I change the white point to D65 (or 5500), that de76 max goes up to
>>> around 20, so clearly D50 matters.
>>
>> If one has a viewing booth sitting next to the monitor, then the white
>> point on the display has to match that in the booth as closely as
>> possible, in both chromaticities and luminance. But if one is working
>> without a viewing booth, I would think that the white point is far less
>> relevant.
>>
>> Whether the display's white point is D50 or D65, and as long as the
>> monitor is the brightest light source in the work environment, the
>> process of chromatic adaptation in the viewer's eyes will discount the
>> illuminant anyway.
>
>
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--
Steve Miller
Norwood Publishing
1000 Highway 4 South
Sleepy Eye, MN 56085
507-794-8203
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