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: Marc Levine <email@hidden>
- Date: Fri, 21 Jan 2011 20:17:48 -0500
Yes. If UVcut data is good for you (which is what you get from the white LED), then that would certainly speed things up. It's when you additionally want the UV portion of the spectrum that you have to pay the time penalty.
Marc
On Jan 21, 2011, at 8:05 PM, Roger Breton wrote:
> 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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