RE: Colorimetric Accuracy in the Field
RE: Colorimetric Accuracy in the Field
- Subject: RE: Colorimetric Accuracy in the Field
- From: Roger Breton <email@hidden>
- Date: Sat, 08 Jun 2013 14:49:54 -0400
Tom,
You think that some day soon (a few years?), i1profiler will incorporate a
spectral imaging model? New, yet to be drafted ICC specs will document the
required color transforms? I suppose X-Rite like Kodak and a few other
manufacturers will boast their "proprietary" spectral imaging
implementations.
2016?
Best / Roger
-----Original Message-----
From: colorsync-users-bounces+graxx=email@hidden
[mailto:colorsync-users-bounces+graxx=email@hidden] On
Behalf Of Thomas Lianza
Sent: Friday, June 7, 2013 11:14 AM
To: Henry Davis; email@hidden
Subject: Re: Colorimetric Accuracy in the Field
Hi to all.
There is a fundamental difference between colorimetry and appearance.
There is also a common problem with colorimetry itself. The standard
observer functions are based on averages, there are 10 degree and 2 degree
models that are different. Naturally there are different
illumination/collection geometries. We often see displays with different
backlight technologies measure exactly the same, but when viewed by a single
observer they appear quite different. We don't have strong science in the
area of adaptation in emissive/reflective environments. Colorimetry and
Spectrophotometry are very good for measuring color, but that doesn't mean
that the result of the measurement tracks the appearance of the objects.
The argument of colorimetric accuracy in the field has very little to do
with the quality of the output with respect to appearance. On the other
hand, you do need some notion of the colorimetry to apply appearance
principles, but those principles modify the "colorimetry" to the point that
the notion of "accuracy" is really not much of a factor.
At the ICC, we are looking at some of these issues to improve the total
color appearance transfer of data from input to output.
http://www.color.org/icclabs.xalter
This effort is aimed at multispectral imaging chains and advanced imaging
work chains that carry multidimensional reflectance models. This work is
going to be an open source effort and we will be building a reference
implementation as well.
Regards,
Tom Lianza
Co Chair ICC .
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