RE: Apple ADC24 uniformity test
RE: Apple ADC24 uniformity test
- Subject: RE: Apple ADC24 uniformity test
- From: Roger <email@hidden>
- Date: Sat, 05 Dec 2009 12:02:16 -0500
Bob,
Firstly, at 80 cd/m2, one could say you're literally working in a cave (as
some list members often comment on), for 80 is roughly the level old CRTs'
calibrated luminance when aiming for ISO-12646 D50 chromaticities, for
screen to proof comparisons (remember Kodak's old Matchprint Virtual when it
shipped with the SONY Artisan CRTs; they had that black drape around the
viewing station to make sure the observer was adapted to the screen white
point, they no longer need to do that given LCD's "higher" luminances).
ISO-12646 Section 4.8 states: "The luminance level should be as high as
practical but shall be at least 80 cd/m2 and should be at least 120 cd/m2."
But I'll agree that 80 is very sweet on the eyes, it could never cause any
eye strain or fatigue whatsoever. The only potential side effects, arguably,
could come in the form of lower perceived contrast.
Secondly, sadly, 80 cd/m2 falls quite shy of IDEAlliance's 160 cd/m2
luminance requirement for monitor certification.
So, yes, on the one hand, I agree it makes economical sense to drive those
prohibitively expensive monitors at luminance levels that extend their
backlit/front panel life as much as possible to enjoy their warranties to
the fullest. On the other hand, the lower the calibrated luminance level, in
my experience, at least, the lower the surrounding lights have to be brought
down in order to obtain a brightness "match" between the light falling on a
proof and the light emitted by the screen. At some point, you have have
already found this out, Bob, the illuminance of those convenient desktop
viewing booths cannot be brought down any further, and even at those low
iluminance level, at a little less than 500 Lux, a proof illuminated by a
D50 simulator still appears way brighter than the corresponding screen
version. So, for working in "isolation", where no match to a hardcopy is
required, I agree that 80 or even less is plenty for doing useful work and
would allow one to enjoy an LCD monitor's warranty to its fullest. But for
working with hardcopy proofs, I don't know, what do you think?
Best / Roger
> So none of them is suitable for 140cd/m2 you mention, and I use my
> CG210 and
> 211 at 80, as recommended. I'm typing this in a daylight illuminated
> room
> with the monitor at 80 - no problems. I do partially darken the room
> when
> doing color work.
>
> Bob Frost.
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