DEAR PETER, When training in Photo Science at RIT we used the CIE system CHEERS! BOB _____ From: pure-silver-bounce@xxxxxxxxxxxxx [mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of Peter Badcock Sent: Wednesday, November 11, 2009 8:02 AM To: pure-silver@xxxxxxxxxxxxx Subject: [pure-silver] Re: OT: Color IQ Test Thanks Bob and Jean-David for your real life examples requiring top notch colour acuity. Jean-David, was it impractical to have the (chips from the) Munsell <http://en.wikipedia.org/wiki/Munsell_color_system> Book of Color on hand when studying the picture coding for digital TV transmissions. Fancy having to memorise 4000 different colour chips ! rgds Peter 2009/11/10 Jean-David Beyer <jeandavid8@xxxxxxxxxxx> It took me and my fellow trained observers several months to learn the 4000 or so color chips in the Munsell Book of Color. And we were retested about once a week, IIRC.