AW: AW: colorsync-users digest, Vol 3 #759 - 12 msgs
AW: AW: colorsync-users digest, Vol 3 #759 - 12 msgs
- Subject: AW: AW: colorsync-users digest, Vol 3 #759 - 12 msgs
- From: Dietmar Wüller <email@hidden>
- Date: Thu, 24 Apr 2003 08:57:40 +0200
The Luther condition basicly says that a reproduction system which
represents the spectral sensitivity of the human eye leads to a perfect
color reproduction.
This is obvious but he defined the scientific basis for that in a paper
published in 1927. The official reference for the paper is "R. Luther,
Aus dem Gebiet der Farbreizmetrik (Colormetric), Zeitschrift f|r
technische Physik, 1927 Pages 540 - 558.
The paper unfortunately is in german. I always wanted to translate it
but never took the time...
Although there is no english translation as far as I know it is
referenced in a large number of papers at color conferences.
For those who are interested in the document I just put it on our
website www.image-engineering.de.
Dietmar
Image Engineering Dietmar Wueller
Dietmar Wueller
Augustinusstr. 11e
50226 Frechen
Germany
Phone +49 2234 965620
Fax +49 2234 965611
e-mail email@hidden
www www.image-engineering.de
>
-----Urspr|ngliche Nachricht-----
>
Von: Roger Breton [mailto:email@hidden]
>
Gesendet: Mittwoch, 23. April 2003 19:20
>
An: Dietmar W|ller; email@hidden
>
Betreff: Re: AW: colorsync-users digest, Vol 3 #759 - 12 msgs
>
>
>> The ideal digital photography technique for fine art reproduction
is
>
>> "multi-spectral imaging". For the moment, these are only lab-type
>
> digital
>
>> cameras fitted with a filter wheel of six or seven color filters
that
>
> are
>
>> used in the field by a limited few. A picture is taken through each
>
> filter
>
>> and later recombined in the computer. That's the technique being
used
>
> at
>
>> the
>
>> London Art Gallery and more and more around the world. Even though
>
>> constant
>
>> progress is being made in this field -- there was a whole symposium
on
>
>> multi-spectral imaging at RIT this spring -- it's going to take a
>
> while
>
>> before the Kodak, Canons and Nikons of this world bring to market a
>
>> digital
>
>> camera employing this technique.
>
>>
>
>> But it sure is the way to the future. Well beyond ICC and any
camera
>
>> profiling scheme...
>
>>
>
>> Roger Breton
>
>> Laval, Canada
>
>> graxx@videotron
>
>
>
> I agree with Roger that multi-spectral images provide a lot more
>
> information about a scene but in most cases there is no need for
this
>
> information.
>
> It would be easier if the sensor manufacturers would improve the
>
> spectral sensitivities of their sensors to match the Luther
condition. A
>
> soon as a camera achieves the spectral sensitivity of the human eye
the
>
> color reproduction problems in digital photography for fine art
imaging
>
> would be solved.
>
> We started testing digital cameras in 1997 and found that the
>
> sensitivity of the actual sensors is a hell of a lot better than it
was
>
> a couple of years ago.
>
>
>
> Dietmar Wueller
>
>
>
>
Which begs the question : what is the "Luther" condition?
>
>
Regards,
>
>
Roger Breton
>
Laval, Canada
>
email@hidden
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