Hi - THANKS to those of you who have responded to my earlier message. I am interested in continuing the discussion directly with others who are interested. In particular, I am interested in exploring camera profiles and the set of colors used to improve the accurate of specific cameras. I must admit that I have not actaully done the math when I mentioned that the colors of the ColorChecker were not close to the colors commonly found in our documents. My immediate interest is in working with the Library and contractor staff who are directly involved in imaging our collection materials. So I simply import a color set (as Lab values) into ColorThink and display the colors, a gamut boundry, and the ColorChecker colors. Thus, by "distant" I am referring to the visual distance between color points in the ColorThink plots. I find this presentation is immediately comprehended - and usable! - by the staff. Unfortunately, almost any use of math and deltas tends to turn them off. The Library has an extremely large "production" conversion operation going. The Internet Archive currently has a ongoing "mass" conversion effort focused on materials from our general collection. They apparently operate on a "good enough" imaging model and considering they produce millions of images a year, the results are quite good and usable. Down the hill, the National Gallery of Art does almost "one-of-a-kind" imaging of their valuable artwork. We are in the middle. We still use scanners for large objects such as maps and posters, but most frequently we use PhaseOne P65+ backs and even two new Aptus II (80 mp) backs with production rates of a few dozen an hour from each camera. I am looking for a simple way to improve color accuracy without reducing production - or increasing costs! So I would like references, documentation, best practices, even hints and suggestions that will help me select color sets for profiling, determine what are reasonable expectations for improved color, and design experiments to test color sets against expectations. Thanks, -barry F. Barry Wheeler, Digital Projects Coordinator, Office of Strategic Initiatives, The Library of Congress Washington, DC 20540 bwhe@loc.gov 202 707 8581