Re: Monitor Calibration
Re: Monitor Calibration
- Subject: Re: Monitor Calibration
- From: Klaus Karcher <email@hidden>
- Date: Wed, 18 Nov 2009 22:27:12 +0100
J.Raimar Kuhnen-Burger wrote:
Hallo Klaus,
Hallo :-)
Keep in mind that these have just only be measurements of the white.
Especially for wide gamut units, all colorimeters need a correction. And, as
I´ve wrote, they also need a correction for every other display that does
not match the device manufacturer´s internal standard.
With precise corrections everything is getting better. The Delta between a
DTP94 and a CS2000 drops to 0.001�uv for the whitepoint.
fortunately :-)
Using EDID data is not the right way as the EDID data is in most cases not
identical to the real values. As soon as you change the whitepoint or adjust
the LUT, the xy chromaticity of RGB change and that is not compensated by
the EDID even if it is precise.
At least some of those "smart" displays seem to report fairly reliable
EDID data and they are clever enough to update them when one switches
between built-in presets. I, for one was amazed at the good agreement
between the EDID data of my HP Dreamcolor and my own measurements with
an Eye-One Pro (Argyll driver in high-res mode) -- at least when the
monitor was new. Meanwhile the situation changed for the worse
significantly, but that's anoter story )-:
... and I agree that this positive example can not be generalized.
But I think in general it's a good recommendation to take colorimeter
measurements with a pinch of salt as long as one can't be sure that the
device plays nice with the particular display. At least when it comes to
white point matches between viewing boot and display one should rather
trust one's own eyes in case of doubt IMHO.
Klaus
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