Graeme, I'm not so sure that an aging display can be recalibrated with a measurement made on a new one. And the problem is that it is precisely people who do prepress who are going to age a display by running it 10 hours a day, and will refuse to throw it away after a year. Edmund With the scheme above, all you need is for someone with a spectrometer > to measure the display, and then everyone else with any colorimeter > that uses this scheme can use the measurement to create a n accurate > correction matrix for their particular colorimeter. That reduces the > scope of the problem considerably. > > Graeme Gill. > >