Dear Graeme, I was going to ask this for some time. Creating a profile with command line like colprof -qm -am AA55hVFAI00100_ARW where AA55hVFAI00100_ARW is in fact AA55hVFAI00100_ARW.ti3 and colprof is of version 1.5.1 results in a profile with gamma of approx. 1.078125 You can see the ti3 in targ of the http://s3.amazonaws.com/IliahBorg/AA55hVFAI00100_ARW.icc.zip If I use -aG, resulting gamma is the same 1.07, which makes -am mode sort of redundant. -- Best regards, Iliah Borg