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: Ernst Dinkla <email@hidden>
- Date: Fri, 14 May 2010 12:23:19 +0200
Prior Art written here, in case someone likes to apply for patents.
CMY(K) displays
Reflective case. Suppose you have a viewing booth with a clear
electrowetting display and a proof print next to it both illuminated by
one and the same D50 or switchable light source like used in good
viewing booths. Suppose you slip several sheets of the same paper or
just one, all unprinted, underneath the clear display and a small
vacuumpump pulls the black board underneath the paper sheet against the
clear back of the electrowetting display so the paper gets a tight
contact with the display,. Several conditions are equal but the
transparency of the electrowetting display will show. Add an ND
transparant plate of the same character on the proof print and intensify
the viewing light. Or reduce the viewing light strength that shines on
the proof paper accordingly without influencing its spectral output.
Both display and print proof need calibration and profiling but that can
be created with a standard neutral paper quality and may
not need to be done per paper used. Both display and ND glass have to be
transmissive for UV light.
Another system, hopelessly more complex. Use the "transreflective"
electrowetting display, give it a minimal output LED backlight or two
different output illumination foils that can simulate a range of paper
whiteness choices in D50 etc conditions: simulation of FWAs, natural
white papers, TiO2 loaded ones, whatever + slightly more light coming
from it to compensate the light loss of the electrowetting display build
up. Put a neutral white opal foil in between, like teflon, that will
act neutral to any light coming from back or front, Balance the
reflection/transmissive properties of that foil to get the proof paper
whiteness at the front of the panel, both proof paper and display
getting the rest of the illumination from the viewing booth light
source so in reflective mode. The total a kind of dynamic white
calibration. On top of that calibration and profiling of the
electrowetting CMY display, special extra neutral sheet inserted instead
of a paper. Soft proof calls synchronise with the backlight paper white
simulations. In case paper white spectral data is needed I just added a
page + a tool with about 100 paper white spectral plots:of inkjet
papers to my pages.
http://www.pigment-print.com/spectralplots/spectrumviz_1.htm
Transmissive case, Calibration + profiling like transmissive RGB
displays. You need other drivers, software, profiling software, etc
possibly other videocards and face the same metameric issues that play a
role with what exists already between displays and viewing booths. The
subtractive mixing may correspond more to the "subtractive" mixing of
printing inks and the CMY hues may correspond more but that are the only
possible advantages.
--
Met vriendelijke groeten, Ernst
Try: http://groups.yahoo.com/group/Wide_Inkjet_Printers/
| Dinkla Grafische Techniek |
| www.pigment-print.com |
| ( unvollendet ) |
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