Re: LaCie, Blue Eye and luminance value
Re: LaCie, Blue Eye and luminance value
- Subject: Re: LaCie, Blue Eye and luminance value
- From: neil snape <email@hidden>
- 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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