Re: A metameric match between display and print?
Re: A metameric match between display and print?
- Subject: Re: A metameric match between display and print?
- From: Karl Koch <email@hidden>
- Date: Thu, 13 May 2010 11:23:22 +0200
… and then: forget all and any attempts to calibrate/profile this
thing! In reflective mode it will be 100% dependent from the kind of
light source _ daylight, tungsten, fluorescent, you name it. In 100%
transmissive mode OR under 100% D50 (not in mixed mode, though, as
long as the backlight isn´t the SAME "D50" as well) lighting profiling
would be viable, but who is to control that?
If anybody on the list should think that there is only ONE D50, I´m
prepared to explain further ;-)
Karl Koch
Am 13.05.2010 um 04:55 schrieb Graeme Gill:
Marco Ugolini wrote:
Though I don't want to jump to possibly incorrect or hasty
conclusions, I am
questioning the very usefulness and need for this type of displays.
I'm not saying they
are useless, because I don't know enough to say so, but I'd like to
be told clearly and
precisely why and in which ways they represent a technological
advance.
In principle a CMY based filter display technology could be quite
useful. As the
IEEE article points out, there are no perfect portable device
displays at the
moment. LCD is very power inefficient (because each pixel filters
2/3 of
the light out and has polarisation losses), and is poor in bright
sunlight
because it depends on the backlight.
Digital ink displays are slow, not terribly reflective and do color
poorly. Ideally a display would be flexible.
A CMY filter based display could have reasonable color, low power
(because
its best case transmissive/reflectiveness is 100%), and could operate
well in sunlight in reflective mode,just like print or photographic
transparencies. Note though that it can suffer from the same gamut
limitations
as print if it is used in reflective mode or with a backlight that is
broadband rather than RGB narrow band. But a practical electronic
CMY filter
display is up against some problems. By it's nature it has to layer
the
active elements one on top of each other, and this tends to create
multiple
optical surfaces. If each filter is not 100% transparent in the
"off" state,
then the lack of transmittance is compounded with 3 layers. The
choice of
CMY colorants have similar issues to print in terms of how well they
complement
each other (black point and black density) vs. how saturated colors
can be
with broadband incident or reflected lights source. And then there
are the
electronic issues such as speed of operation (can it do animation ?),
contrast ratio, proportionality (does it do grey levels well ?), power
consumption of the filters, addressing/driving issues, manufacturing
costs, etc.
Graeme Gill.
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