Re: dtp70 is dead
Re: dtp70 is dead
- Subject: Re: dtp70 is dead
- From: Derek Lambert <email@hidden>
- Date: Mon, 5 Mar 2007 08:14:57 -0500
This is what I received from Xrite support few days ago. It's from
Mexico, so the english is not perfect:
"Dear Derek,
Inside, we use LED technology for illuminating surfaces instead of
using tungsten or any other lamps. These were done due to the very
short splash time and extremely long life time (as an outcome –
device measure pretty fast).
To obtain inter instrument agreement with EyeOne Pro, iSis uses two
types of LED.
To get NO data within EyeOne Pro (and to be comparable) we have to
use UV-cut data + part of spectrum which adds UV zone in iSis (NO
settings there). Only in this case we will get the whole visual range
and also lights which are influence on our visual impression.
Thats why we have to measure two times instead of one on each patch.
The general idea is that iSis measures twice same field that why it
takes longer. Also we cannot multiply time simply by 2 (instead of 8
seconds iSis measures 16 seconds), the software has to be control
exact positioning each time of measuring. This also takes some
seconds, ets."
-------------------------
Derek Lambert
Director of Prepress Services,
Color and Information Technologies
On Mar 3, 2007, at 1:40 PM, Roger Breton wrote:
Klaus,
Thank's for your most informative reply.
http://www.gretagmacbeth.com/downloads/i1_isis_brochure-en.pdf :
"In a single chart measurement cycle you can read both UV-cut and
measurements with no filter."
I was under the impression that the instrument required an extra
piece of
optics to be installed by the manufacturer to allow UV-filtered
measurements. That takes care of that.
http://en.wikipedia.org/wiki/LED#Ultraviolet.2C_Blue_and_white_LEDs :
"If the active quantum well layers are GaN [...] the device will emit
near-ultraviolet light with wavelengths around 350-370 nm."
Which begs the question; exactly which LEDs are used in the iSis?
http://en.wikipedia.org/wiki/Aluminum_gallium_nitride :
"AlGaN is used to manufacture light-emitting diodes operating in
blue to
ultraviolet region, where wavelengths down to 250 nm (far UV) were
achieved."
Wow. I didn't know.
Regards, Klaus
Roger Breton | Laval, Canada | email@hidden
http://pages.infinit.net/graxx
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