I have added chart definitions for the Wolf Faust C1 target, Christophe Métairie's Digital TargeT 003 (in its properties somehow comparable to the ColorChecker SG), and for the basic 24 patch ColorChecker target. all definitions are given for D50 and D65 illuminants of the 2 degree observer: http://www.oyranos.org/wiki/index.php?title=Argyll_Chart_Definitions Please, use them as you like. And give feedback if something is not correct. Graeme, you may also include them in future ArgyllCMS distributions if you feel they've been produced correctly. Guy -- Guy K. Kloss Institute of Information and Mathematical Sciences Te Kura Putaiao o Mohiohio me Pangarau Room 2.63, Quad Block A Building Massey University, Auckland, Albany Private Bag 102 904, North Shore Mail Centre voice: +64 9 414-0800 ext. 9585 fax: +64 9 441-8181 eMail: G.Kloss@xxxxxxxxxxxx http://www.massey.ac.nz/~gkloss/