Re: Colorimetric Accuracy in the Field
Re: Colorimetric Accuracy in the Field
- Subject: Re: Colorimetric Accuracy in the Field
- From: Thomas Lianza <email@hidden>
- Date: Sat, 08 Jun 2013 20:22:18 +0000
- Thread-topic: Colorimetric Accuracy in the Field
I am desperately trying to keep this work Open source with a reference
implementation for developers to use. There will be a presentation next
week by Max D. who is doing most of the spectral work. One of our X-rite
team is working on the appearance aspects.I think we will open the project
up before the end of the year. I really am pushing to keep the
"proprietary" stuf to a minimum. This is so complex that it needs real
working examples. The documentation will probably take a year, but it has
already started. I will come back with a report after the ICC meeting
next week.
On 6/8/13 2:49 PM, "Roger Breton" <email@hidden> wrote:
>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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