Re: LaCie, Blue Eye and luminance value
Re: LaCie, Blue Eye and luminance value
- Subject: Re: LaCie, Blue Eye and luminance value
- From: "amadou diallo" <email@hidden>
- Date: Thu, 10 Jun 2004 07:13:44 -0400
Set at D65 with a 2.2 gamma, I'm getting a 91.46 luminance value after
calibration. I'm not sure how to determine a "black bias of .2-.3". How do I
check this?
>From: neil snape <email@hidden>
>To: amadou diallo <email@hidden>,
<email@hidden>
>Subject: Re: LaCie, Blue Eye and luminance value
>Date: Thu, 10 Jun 2004 06:39:50 +0200
>
>on 10/06/2004 6:15, amadou diallo wrote :
>
> > Does anyone the unit of measure for the "luminance"
value the Blue Eye
> > software gives after calibration? Is it lamberts? I'm trying to
get a feel
> > for how much life the CRT has left. Gradients still look good, but
as the
> > guns deteriorate I figure the luminance (set to maximum in the
software)
> > will gradually decline. How low can the luminance value, as
reported in Blue
> > Eye, reach before it's time for a new monitor?
>
>It's a bit more complicated than that. The black point setting greatly
>influences the maximum attainable white balance and luminosity. What
this
>says is that as the monitor ages you can increase the relative
luminosity by
>having a weaker black. This is a reduced range and possibly the gamma
will
>start to become quite non-linear. What I have seen in aged monitors are
a
>changed hue angle of the chromocities that affect saturated colors even
with
>the best calibrations and profiling. That said an old monitor may be
>acceptable for lower gamut imaging that fits within the aged phosphor
set.
>Not ideal but still usable.
>Blue Eye X shows candela/square metre cd/m2 and the results are of
>course subject to your presets. At D65 you'll get up to +120 cd/m2 on a
new
>monitor. If you make a reasonable preset you should maintain a 85cd/m2 L
>with a black bias of around 0.2-0.3 for many years without problems on a
>22".
>
>Neil Snape nsnape @ noos.fr neil_snape @ mac.com
>
http://mapage.noos.fr/nsnape
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