RE: Measuring "standard IT8.7/4 Random" on iSisXL using ColorPort 2.0
RE: Measuring "standard IT8.7/4 Random" on iSisXL using ColorPort 2.0
- Subject: RE: Measuring "standard IT8.7/4 Random" on iSisXL using ColorPort 2.0
- From: Roger Breton <email@hidden>
- Date: Fri, 21 Jan 2011 20:05:28 -0500
But Marc, I have seen some applications drive the iSis using the visible
spectrum white LED only? And feed that data straight to the host
applications, for reporting to the user. So, I am curious. Of course, that
method cuts the measuring time in half.
Thank's for coming to my rescue / Roger
-----Original Message-----
From: colorsync-users-bounces+graxx=email@hidden
[mailto:colorsync-users-bounces+graxx=email@hidden] On
Behalf Of Marc Levine
Sent: January-21-11 6:02 PM
To: email@hidden
Cc: Breton Roger
Subject: Re: Measuring "standard IT8.7/4 Random" on iSisXL using ColorPort
2.0
Roger,
In ColorPort 2, select "Tabloid" as you page size and set the left margin to
5.5cm. That should do the trick regarding the chart format.
As far as the iSis speed goes, the iSis makes 2 passes by design. The 2 LEDs
(1 capturing only the visible spectrum and the other capturing only a
portion of the UV spectrum) cannot be on at the same time. The 2 spectrums
must be captured independently. I believe that the spectrums are then
mathematically merged in the SDK and then pushed to the application that is
driving the device.
In any event, there's no way to turn both LEDs on a once. I am fairly
confident that this was explored, considering that the iSis was originally
intended to be a market competitor to the DTP70 (before X-Rite acquired
GMB). If it were possible to turn both LEDs on at once - or possibly flash
them at high speed to "weave" the measurements together - then X-Rite would
have done that.
Last note, I find it additionally interesting that not only must the LED and
visible spectrum components be captured independently, but they must also be
captured is the same direction of head-travel. You might notice that the
head sweeps twice before retracting the media to take its second set of UV
readings. And... if you have 1 row left in the chart, the head will always
read the visible, return to home, and then read the UV. Strange, but
important to somebody somewhere.
Whatever the case, the iSis works like it works. The DTP70 used a single
light source to capture either UV-in or UV-ex measurement. The iSis uses 2
light sources, requiring 2 passes if you want UV-in (because the measurement
is built from 2 pieces of data). Like Steve mentioned, the only way to make
the iSis go faster would be to scan in "UVcut" mode, where measurement from
the UV LED is skipped.
Hope this helps,
Marc
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