Re: X-Rite iSis and dual measurements
Re: X-Rite iSis and dual measurements
- Subject: Re: X-Rite iSis and dual measurements
- From: Terence Wyse <email@hidden>
- Date: Sat, 28 Jul 2007 11:53:24 -0700
On Saturday, July 28, 2007, at 11:43AM, "Dan Reid" <email@hidden> wrote:
>on 7/27/07 11:05 AM, Jim Rich at email@hidden wrote:>
>The HP DesignJet z-series uses the same technology as iSis UV cut
>measurements. Jim is correct that the rev. D is also using the new LED
>illumination too.
I beg to differ Dan-O. I believe the RevD i1 still uses tungsten illumination just like the older RevA-C. It MAY use the same sensor technology as the iSis but the illumination is the same as before if you believe that the info on GMB's website is current. I was also told by a reliable source that the i1 RevD and iSis use the same "chip set" but it doesn't appear that this includes th illumination.
Furthermore, I've been doing some comparing this past week with a RevA i1 UVcut, RevD i1 No Filter and iSis in both No Filter and UVcut modes and can confirm that there is NO similarity in the meausurements between these three units, in particular between the RevD i1 and the iSis in no filter mode where you might expect them to agree if in fact they use the same illumination. The difference is not subtle either. Measuring some ink primaries from an inkjet printer, the difference is up to about 3 dE, especially on the cyan ink. Even the paper white values do not agree within a reasonable tolerance.
I'm also on press this week using my NetProfiler-certified SpectroEye and comparing these measurements to the iSis. Again, not much agreement between the two (I trust my SpectroEye more than anything else) to the point that the iSis is a bit suspect in my mind. I want to do some further investigating before I draw any conclusions but right now I'm not inclined to believe 100% what the iSis is telling me.
>
>Just to makes things more interesting the HP z-series printers measure at
>20nm increments while the rev A-C (not sure about rev D) measure in 10nm
>increments. Also interesting to note GretagMacbeth devices always measured
>in 10nm increments while X-Rite choose 20nm increments for their legacy
>devices. And if you are following all of this then you might be interested
>to know the sampling of HP z-series is 400-700nm unlike the i1 which is
>380-730nm.
GMB still states 10nm for the RevD i1.
>
>I have been pushing for many moons to get NetProfiler revised to handle
>X-Rite and GretagMacbeth device calibration and certification onsite. Man it
>would be sweet to get the customer's spectrodensitometer to agree with mine!
>I'll ask Santa Claus again this year. . . .. I have been really good!
NetProfiler is an awesome tool and something that X-Rite should be all over in getting all their instruments to support it. I'm using in on my SpectroEye and it's gone a long way to install confidence in what I'm doing on press.
Regards,
Terry
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