I had never heard of ArgyllCMS until two days ago, so am absolutely a newbie. The task I'm trying to achieve is to measure watercolour paint samples to update an artist's colour wheel but on the CIECAM02 Jab model shown at <http://www.handprint.com/HP/WCL/cwheel06.html>. I have a GretagMacbeth Spectrolino, the white calibrating chip, and Windows software but want to use it on Ubuntu 14.04 LTS Trusty, hence ArgyllCMS. I looked up "watercolor" in the list archive but all of the posts related to digitally photographing watercolour paintings, and attempting to reproduce them in print as well as could be done, in some cases using the same paper as the original painting was on. My task is simple: to record measurements for each colour paint, and convert them to colour angle and saturation percentage to plot a colour wheel with sample spots as shown at the Handprint site. Graeme Gill kindly pointed me to spotread and xicclu as the commands to use. But I'm totally bewildered by all the options because I have very little knowledge of colour science. Some questions to be answered: - Should I calibrate the instrument using the white chip or using the Arches paper on which the samples will be painted, it being the one I use for all my paintings? - What options should I set for spotread to get the correct output to the log file? (Graeme has advised me how to edit the log file to retain just the data needed.) - What options should be set for xicclu? (Graeme has advised me to use the lab2lab profile.) Regards, Hedley -- Helping Senator George Brandis <https://mail.google.com/mail/?view=cm&fs=1&tf=1&to=senator.brandis@xxxxxxxxxx> , Malcolm Turnbull <malcolm.turnbull.mp@xxxxxxxxxx> , Bill Shorten <bill.shorten.mp@xxxxxxxxxx>, and Jason Clare <%3Cjason.clare.mp@xxxxxxxxxx%3E> collect our metadata. Won't you join all of us? Just C.C. < senator.brandis@xxxxxxxxxx <https://mail.google.com/mail/?view=cm&fs=1&tf=1&to=senator.brandis@xxxxxxxxxx> > , <malcolm.turnbull.mp@xxxxxxxxxx> , <bill.shorten.mp@xxxxxxxxxx>, and <jason.clare.mp@xxxxxxxxxx> on every outgoing email. The Australian government and spineless opposition are going to spend $400 million to record all our incoming and outgoing call numbers, email addresses, and browsing destinations for "security". What an invasion of privacy and a misuse of money! 1/17 Glyndon Road, Camberwell VIC 3124, Australia hedley.finger@xxxxxxxxx Telephone 03 9836 4635 Mobile 0412 461 558 LinuxCounter.net registered computer 576484 (course there are more Linux users than that!)