Graeme Gill wrote: > I did a simple test using my ColorMunki and a CRT based monitor. > I've had the instrument taped to the one spot, and the display > and instrument powered up for some hours. There was a noticeable > amount of drift over the first hour or two, but after that the > readings were fairly constant. Thanks for testing! I would consider the temperature of a CRT tube as very cool (isolating vacuum), compared to a LCD screen with backlight, so I'm really astonished that even with a CRT there is such a long lasting drift. > Using spotread, the error to a reading taken as a reference once the drifting > had finished remains under 1 delta E, and averages about 0.5 delta E. > The smallest error is less than 0.1 delta E. The smaller temperature difference (room temperature<->CRT) should result in a lower drift, so this does not signify that your ColorMunki is better/less prone to drift, right? > Recalibrating does not seem to affect this. This means that your ColorMunki is also not back to its first readings after a self-calibration? > [I'd guess that the variation in this case is due to the lack of > synchronization between the CRT refresh rate and the instrument integration > time.] This reminds me of the question, if it is possible that the temporal dithering used in panels to gain 10 Bit resolution is jointly responsible for measurement variance? Regards, Juergen