Re: LCD's and Room Illumination
Re: LCD's and Room Illumination
- Subject: Re: LCD's and Room Illumination
- From: Klaus Karcher <email@hidden>
- Date: Sun, 11 Nov 2007 11:37:18 +0100
Russell Proulx wrote:
On 10 Nov 2007 at 12:03, Andrew Rodney wrote:
In fact, the recommendation I got for calibration of my
NEC 2690 was 150 cd/m2 when I was going to try to hit 120
cd/m2. Why? 120 cd/m2 is just at the lower limit of what
the (brand new) display can adjust itself to using the
backlight alone.
I've seen some *very bright* LCDs that have problems getting much below
200 cd/m2. And some recent models brag about 1000:1 contrast ratios
(certainly not by making blacks blacker..) which will make it even harder to
get them to perform well with their backlights set to minimum.
I'd like to ask the manufacturers of such LCDs why their products are
incapable of getting below 200 cd/m2 and if it's advisable to use them
at home or in a professional (office or image editing) environment from
an ergonomic point of view. I don't think it's good for one's health to
use them in a dim environment.
I just wonder if we're going to have to find a new way of thinking about
monitor brightness and ambient light illumination as don't think the old CRT
way of thinking works with very bright LCDs.
It's no problem to take the ambient conditions into account when
profiling a display -- Color Appearance Models are made to deal with it.
Take argyllcms as an example (see
<http://www.argyllcms.com/doc7/Scenarios.html#PM4> and
<http://www.argyllcms.com/doc7/profile.html>): you can use one of tree
predefined viewing conditions for monitors:
mt - Monitor in typical work environment (La = 22 cd/m2 <=> 350 lx)
mb - Monitor in bright work environment (La = 42 cd/m2 <=> 660 lx)
md - Monitor in darkened work environment (La = 4 cd/m2 <=> 64 lx)
or use your own when building a LUT based monitor profile.
Different viewing conditions are settled when using perceptual or
saturation transforms. Unfortunately Photoshop always uses the
colorimetric intent for display transforms AFAIK where the compensation
does not apply.
Klaus Karcher
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