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The calibration is OK if the target values are confirmed
by the characterization. For instance:
Color temperature 6500K
Somewhat 'bowed' LUT correction curves aren't harmful.
A few levels are lost, but this is normally not observable
The LUT corrections can be forced to almost linear
tone reproduction curves, if the monitor is adjusted by
monitor menues so, that the LUT doesn't have to correct
much. In other words, a pre-adjustment by trial and error
so, that the monitor is almost correct without LUTs.
Whether this is altogether better than a harsh correction
by LUTs is doubtful. But the benefit is this: not color
managed applications are shown reasonably.
After finishing the Calibration and the Characterization,
the result can be tested by patterns:
Either the PDF, which requires correct settings:
Or the HTML doc which works with generic settings:
Best regards --Gernot Hoffmann
Thanks for yr thoughts, the characterization confirm the target values luminance is ok at 90cd/m2, gamma 2.2, colour temp is 5500.
But to get these values, I now have to set the gamma control on the monitor to -40, where as it used to be 0, the range is -40 to +40, the red channel is almost at max, the green and Blue at their mins almost.
Hence my question about ageing.
The screen itself looks ok colour wise, I will check it with yr patterns, but I have to make a trip to see my mother tomorrow, 85 and not well....
On my return I will let you know the results of the pattern check