Re: Monitor calibration software/hardware
Re: Monitor calibration software/hardware
- Subject: Re: Monitor calibration software/hardware
- From: Derrick Brown <email@hidden>
- Date: Thu, 20 Sep 2007 21:39:57 -0400
Andrew writes.........
in providing information
to the user about the so called accuracy or the results they hope
to achieve
from the calibration and profiling process. Its a feel good button.
So if I have your position correct on monitor profile validation,
according to your comment above there is no value in having tools
with a given instrument that can perform the following task...........
If a user has a monitor(simple LCD or CRT, no ddc) and they are
trying to achieve a certain calibration parameter set , lets say a
brightness of 120cd/m2 at a gamma of 2.2 with a white point of
5000kelvin, and they are using a Spyder2 Pro, DTP94, EyeOne Display2
or Eye One Pro as their measurement device.
When the calibration is complete and a validation is executed
(profile validation, not instrument validation) you are left with a
set of values that reflect performance characteristics of the
calibration, like dE values of a set of LAB values put thru the given
profile then measured with that same instrument.
Now lets say those values (only for conversation sake) say that your
lowest black measured has a dE of 2.0, and a white of dE 1.5 all
based on your original target parameters for calibration.
So now you have one data point.
Now you modify two of your parameters , the white point, change that
to 5700kelvin. change the brightness to 110cd/m2. Now without ever
moving the instrument re-calibrate and then again validate.
Your white point error reduces to a dE of 0.5 and dE for black
dropped to a dE .75. Are you saying you didnt learn anything
valuable about your display system? Like maybe if you run this given
display at 5700 k at a slightly lower luminance you may well have
more accurate highlight and shadow detail?
You now have two data points.
Thanks to all.
Derrick Brown
Integrated Color Corporation
81 Rogers Street
N. Billerica, MA 01862
tel: 978-670-1416
email@hidden
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