Re: i1 uv/uvcut
Re: i1 uv/uvcut
- Subject: Re: i1 uv/uvcut
- From: Graeme Gill <email@hidden>
- Date: Wed, 25 Mar 2009 09:56:12 +1100
Andrew Rodney wrote:
Here's a start:
http://www.lumita.com/site_media/work/whitepapers/files/xrite-wp-3a.pdf
I think there's a rather large gap between an article that claims
that spectrometers might be inferior to colorimeters, and claiming
that the i1Pro is in fact inferior is most situations to readily
available colorimeters.
There mere fact that most affordable colorimeters need different
calibration matrices for different display technology, is not a good sign
with regard their general accuracy on sources that they are not
specifically "tuned" for. (ie. they are not colorimeters in
the terms of the quoted article, but are a "Pseudo XYZ or RGB Colorimeter")
Several of the most readily available colorimeters also seem
to have noticeable quantization issues in measuring dark colors,
which is not something that the i1Pro suffers from.
(In a series of tests I ran, I would say that the i1Pro gave more
consistent dark value readings than any of the colorimeters
I pitted it against, with the possible exception of the DTP94.)
Even though in theory a colorimeter can economically collect
more light that a spectrometer, typical instruments do not
do so, but use fairly small (cheap) sensors, making their signal
to noise ratio pretty similar to the i1Pro, depending
on the respective integration times used (ie. you can always improve
signal to noise ratio by increasing integration time and/or
averaging multiple readings).
One issue I have come across with the X-Rite driver for the i1Pro
is that it doesn't reliably detect saturation of sharp wavelength peaks,
and I've seen this affect display readings under some circumstances. (My
i1Pro drivers don't happen to suffer from this issue. :-)
Graeme Gill.
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