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it's very important to calibrate the screen.Jack, as an aside, re my post of a few weeks ago,
We are probably all viewing the images on screens with differing white points.
My screen is fully colour and white point calibrated with a Spyder.
Calibrating with the screens built in system will only give an approximation and needs to be done in conjunction with a calibration chart.
At the very least it should adjusted to see from pure black to pure white (or as near as possible) .