To custom measure someone's own color matching functions requires special equipment I only seen once in a school of optometry. Roger From: argyllcms-bounce@xxxxxxxxxxxxx [mailto:argyllcms-bounce@xxxxxxxxxxxxx] On Behalf Of Ivan Tsyba Sent: February-12-12 5:28 PM To: argyllcms@xxxxxxxxxxxxx Subject: [argyllcms] Re: Direct matching between two displays 2012/2/12 Roger Breton <graxx@xxxxxxxxxxxx> Ideally, instead of using the 1931 Standard Observer color matching functions, we would be using YOUR very own carefully measured color matching functions. Someone from this mailing list perform color matching experiment to build it own Observer Functions? I think CIE Standard Observer functions is acceptable in most cases in practice. Calibrating to absolute gamma value is helpful in my situation or not? Thanks