I love these discussions, Graeme und Gerard :-) / Roger -----Original Message----- From: argyllcms-bounce@xxxxxxxxxxxxx [mailto:argyllcms-bounce@xxxxxxxxxxxxx] On Behalf Of Graeme Gill Sent: 26 ao├╗t 2014 19:44 To: argyllcms@xxxxxxxxxxxxx Subject: [argyllcms] Re: Fwd: Question about M1 measurements Roger Breton wrote: > Isn't the "target" illuminant always D50 in an ICC profile? For interoperable ICC profiles, yes. But note that traditionally the "D50" that most instruments produce is M0 based, not M1, so mixing M0 and M1 based D50 PCS profiles will have problems. For the business of getting better visual matches in the face of FWA/OBE, then it's desirable to create non-standard ICC profiles for the actual viewing illuminant, rather than D50. Graeme Gill.