Re: Colorimeters and third-party developer support (Tom Lianza)
Re: Colorimeters and third-party developer support (Tom Lianza)
- Subject: Re: Colorimeters and third-party developer support (Tom Lianza)
- From: Bob Frost <email@hidden>
- Date: Sat, 20 Aug 2011 18:24:27 +0100
- Importance: Normal
Here are Karl Lang's thoughts on that subject -
http://www.lumita.com/site_media/work/whitepapers/files/xrite-wp-3a.pdf
"In all the cases above we have been discussing expensive instruments that
are
designed to measure "any" light source. In the unique case of display
calibration we
often know exactly what kinds of spectra we are going to measure. As an
example,
let's say we know we are going to measure a Sony CRT. All Sony CRTs use the
same
three phosphors (one red, one green and one blue) known collectively as the
P-22
phosphor set. Variation of the spectra from these phosphors is slight. If we
use these
spectra at the factory when we calibrate our colorimeter, the colorimeter
will have
incredible accuracy measuring a Sony display, far better than any
spectroradiometer
at 10X the price.
An interesting advantage of this kind of "purpose built" colorimeter is it
does not
need to have filters that are near perfect XYZ simulators. All you need are
simple RGB
filters that can discriminate very well between the three primary phosphors.
If you know the source primaries you are going to measure, you can build a
very accurate device for an extremely small amount of money. I have worked
with colorimeters that cost less than $100 to build that rival the accuracy
of a $20,000 spectroradiometer when used on the display they were designed
for.
When a colorimeter is calibrated to the source primaries of a display with a
calibration matrix. The accuracy of the colorimeter on that type of display
is greatly increased. The worst case accuracy of this type of purpose built
colorimeter can not be matched with a spectroradiometer anywhere near the
price. In fact you would have to spend 100 times as much to achieve this
accuracy with a spectroradiometer."
Eizo actually give some figures in their comparison of their built-in
colorimeter with two unnamed colorimeters and a spectrophotometer. -
http://www.eizo.co.uk/accuracy_and_advantages_of_the_coloredge_cg245w
tables and graphs on pages 6,7, and 8.
Bob Frost
--------------------------------------------------
From: "Derek Lambert" <email@hidden>
Really. How much better result will you get with custom device that you
can use with only one monitor?
5%? 10%? 50%?
Or how many delta e?
Maybe it is just a marketing hype from NEC or HP? Do you have a scientific
results that your custom device is way better than retail device with
basiccolor or coloreyes?
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