Re: Eizo CG 21 and Eye-One
Re: Eizo CG 21 and Eye-One
- Subject: Re: Eizo CG 21 and Eye-One
- From: Dan Reid <email@hidden>
- Date: 23 Apr 2005 15:56:42 -0700
- Date: Sat, 23 Apr 2005 15:49:56 -0700
on 4/23/05 10:53 AM, Chris Murphy at email@hidden wrote:
>
> On Apr 23, 2005, at 10:59 AM, Roger Breton wrote:
>
>>> Rather, this is done internal to the display itself.
>>
>> I have to disagree here, Chris. CN does NOT gray balance the Eizo in
>> any
>> way, shape or form. It merely sets the gamma of each channel but does
>> NOT
>> gray balance them, as basICcolor Display v3+ does. Which is why, in my
>> view,
>> CN software has limited valued.
>
> It's a question of method rather than whether it is or is not done
> internally. It is done internally but the methods differ. Theoretically
> if you set white and black point for each channel correctly, the same
> gamma for each channel should produce gray (assuming the primaries are
> properly paired up to do that). The basICColor and ColorEyes gray
> balance method is iterative, and allows for separate tone correction
> for each channel.
>
> But something else I've noticed is that these table-based display
> profiles that are supposedly better, cause profile induced
> posterization and gray balance crossovers. I won't see it in a
> non-color managed gradient, but will see it in a color managed one,
> when using table-based profiles, but not in matrix-based ones.
>
> I can see how the secondary colors would be more accurate with a
> table-based profile, so if that's more important to you than smooth
> neutrals, then that's the way to go. Otherwise, stick with matrix-based
> display profiles.
>
>
The Eizo CG21 does all it's calibration internally which is why
ColorNavigator uses Matrix-based profiles. Checking gray balance in
PhotoChop with a 11 step LAB neutral gradient looks ideal. I am pretty sure
the ColorEyes Display also addresses the internal LUT tables of the CG21 but
uses a LUT profile to include more information for color characterizing. The
ColorEyes Display L* calibrated profiles show TRC with 1. The B2A1 (LAB-RGB
Colormetric) is a 33 CLUT grid. That's a lot of precision.
Obviously LUT profiles will be more data rich than simple TRC of a
matrix. I've also noticed very slight neutrality imbalance with the
ColorEyes Display compared to the ColorNavigator profiles. Pretty minor.
Even still I think I'll take a v4 compliant monitor LUT profile over a
matrix even with a minor hit in neutrality.
I attribute this to the old thing of too much data is sometimes worse than
less data, similar to printer profiling. A 33 CLUT grid is in IMO too much
precision. A 17 or 9 CLUT precision could potentially smooth out the slight
neutrality hit. Frankly they shouldn't need that much precision if the
calibration is solid in Eizo internal LUTs. Oh well, thanks Chris.
--
Dan B. Reid
RENAISSANCE PHOTOGRAPHIC IMAGING
Color Management Products & Training for Print, Internet, & Motion Graphics
http://www.rpimaging.com | Toll Free: (866) RGB-CMYK
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Colorsync-users mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden