In a message dated 4/27/09 2:50 AM, NGW32 wrote:
> I am due to replace my ageing (4.5 yrs) NEC Spectraview 2180. I have
> narrowed my choice to an Eizo Coloredge CG242W, Spectraview 2690, or
> Samsung XL24 - I have limited info users experience on this model.
> I note that several experienced NEC 2690, and 3090 owners, are
> recommending luminance values at a minimum of 140 cd/m2. Eizo are
> still steering users towards using lower values at a sweet spot of
> 'around' 80 cd/m2.
> For several years I have driven my Spectra at 90 cd/m2 in cave
> conditions, gradually towards 120 cd/m2 in the last year, as a result
> of raising the ambient light slightly for a better working
> environment. I still prefer viewing images at 90 cd/m2. Soft proofing
> at 90cd/m2 for repro, in cave conditions, hasn't caused me any major
> repro scares.
> On the 2690 Is it true that at 140 cd/m2, and lower, the luminance is
> no longer adjusted via its hardware but artificially through the image
> control resulting in part of the contrast being lost?
By "image control", do you mean the OSD (On-Screen-Display) controls in many
of today's LCD monitors?
Some profiling packages (like the one I use, basICColor display) will let
you set an aimpoint for the contrast ratio, along with a user-selected
luminance value for either the white point or the black point.
> 120 cd/m2 is as bright as I would want to go, is anyone running the
> 2690 below at or below 120 cd/m2 with good results?
I cannot answer that specific question, but, in essence, the choice of
luminance depends on what you will use the monitor for. I don't think there
is any one answer that will work for everyone.
If what you do, for example, is retouching work or fine art imaging, and
mostly want the image on screen to look as it should according to the
assigned profile, then a high luminance will work better for you. The human
vision system's chromatic adaptation and ability to adjust for brightness
will do the rest. (At the very least, one must make sure not to sit facing a
bright window or bright artificial lights, and not to have sunlight or
strong artificial lighting falling directly on your display, and things
should be fine. A high luminance, by the way, will greatly *reduce*
interference caused by reflections off the work environment on the display's
surface [in a manner similar to a Signal-to-Noise Ratio in audio].)
On the other hand, if you do prepress work -- using a color-correct light
booth next to your display and soft-proofing on screen to your chosen output
destination -- then you are working within much stricter tolerances, and a
lower luminance will be better for you (80-100cd/m2). Your work environment
will also need to be strictly controlled (dark neutral walls, dark clothing,
no reflections, etc.)
Only prepress-oriented work (with small tolerances for soft-proofing) will
*demand* the lower luminance advised by Eizo. The rest of us will do quite
alright with brighter aimpoints (120 cd/m2 and higher) in non-cavelike work
environments -- provided that common-sense precautions like the ones
indicated above are being observed.
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