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=videotron.ca@lists.apple.com [mailto:colorsync-users-bounces+graxx=videotron.ca@lists.apple.com] On Behalf Of Thomas Lianza Sent: Friday, June 7, 2013 11:14 AM To: Henry Davis; colorsync-users@lists.apple.com 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 .