Re: Ambient light adjustment of monitor calibration
Re: Ambient light adjustment of monitor calibration
- Subject: Re: Ambient light adjustment of monitor calibration
- From: Koch Karl <email@hidden>
- Date: Tue, 31 Jul 2007 11:29:13 +0200
Hi Roger,
it´s actually 2 relevant standards that need to be taken into
consideration: ISO 3664 and ISO 12642.
If you interpret both, you end up with the following suggestions:
Ambient light below 64 lux, best below 32 lux
Monitor luminance ABSOLUTELY above 80 cd/sqm, better above 120 cd/sqm
Viewing light 500 lux ± 125 lux
If you now want your monitor to match the viewing booth, it should be
set to 160 ± 40 cd/sqm (= 120 to 200 cd/sqm). basICColor display
takes this into account when calibrating the monitor and JUST color
communicator2 (basICColor diLIGHT). The brightness of the viewing
booth is being adpted to the calibrated luminance of the monitor. A
traffic light will show if you meet or exceed any of the 2 standards,
also for any other viewing booth that cannot be automatically
calibrated but which can be manually dimmed.
The conclusion is that there is not much variance allowed in the
ambient light and thus no necessity to "dynamically" calibrate to
varying conditions. To do so would mean shooting at moving targets.
All the "solutions" I have seen so far, check ambient light in
shorter or longer intervals. If ambient light changes during these
intervals, you have a sudden change of monitor characteristics when
your correction kicks in. Do I need say more?
Regards,
Karl
Am 28.07.2007 um 22:35 schrieb Roger Breton:
Dear Markus,
what is the general opinion here about ambient light correction that
some monitor calibration systems are offering?
I admit I have not seen one of these "smart" monitors in action. So
it's
unknown to me the degree of adjustment they can modify the monitor
luminance
with respect to ambient lighting. But it does not seem to me like a
useful
feature. To me, monitor calibration should be done for a certain
viewing
conditions and remain fixed from that point on. Usually, people are
after a
viewing booth setup that matches their monitor in luminance. Once
they found
it, I don't see why they would want a smart circuitry inside the
monitor to
alter the screen luminance to reflect ambiant lighing changes.
Sure it ensures, that
one is always able to distinguish between (0 0 0) and (1 1 1) but
then I am not able to distinguish between (0 0 0) and (1 1 1), as
defined in the output space, on a lot of printed material,
particularly on photographic material without illuminating it from
the back.
See above.
Are there any norms for this ambient light correction
The only "norm" I know with respect to ambient lighting in the
graphic arts
or photography is ISO-3664.
or is it
different from software to software?
Maybe the folks at basICcolor have a different idea?
Best,
Markus
Roger Breton
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