Hi Graeme,
thank you for answering. I have to pay for borrowing this instrument.
Therefore I'm interested whether I can use it meaningful to improve
monitor calibration/profiling with this (huge?) difference in luminance
measurement. Advice therefore is welcome.
Here are the differences measured as a series:
A B C diff
356 286 70 20%
320 258 62 19%
286 230 56 20%
250 202 48 19%
216 174 42 19%
180 145 35 19%
144 116 28 19%
108 87 21 19%
73 59 14 19%
35 29 6 17%
17 14 3 18%
Is there a way to create a correction matrix being useful for
the xrite 1Display Pro? Can I trust the measurements of
the GretagMacbeth device?
Best regards
Andreas Mock
-----Ursprüngliche Nachricht-----
Von: argyllcms-bounce@xxxxxxxxxxxxx [mailto:argyllcms-
bounce@xxxxxxxxxxxxx] Im Auftrag von Graeme Gill
Gesendet: Montag, 21. September 2015 01:48
An: argyllcms@xxxxxxxxxxxxx
Betreff: [argyllcms] Re: Big differences in measuring display luminance
Andreas Mock wrote:
Hi,
Now I have the problem that the measured display luminance whilecalibrating
the monitor seems to be really wrong. It is about 20 - 30 cd/m2 lessthan
what I measure with the x-rite.
You don't say what percentage this is.
Can someone give advice how to handle this problem? Is it possible thatthis
old device can't measure precise anymore?
In my experience, the light level absolute calibration of different
instruments is fairly loose. This may be partly due to the difficulty
of establishing absolute measurements and standards accurately.
I think there has been a slight (i.e. about 10% or so) shift in the
standard
X-Rite use for setting up the i1pro Rev E instrument compared to the
previous
Rev A-D instruments, bringing it more in to line with everything else.
I wouldn't expect the difference in absolute calibration level to have
much bearing on the color accuracy though.
[ Ideally there would be an option in ccxxmake to do create a calibration
matrix without changing the Y calibration. ]
Graeme Gill.
