on 7/28/07 11:53 AM, Terence Wyse at email@hidden wrote:
>
> 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.
Ah, maybe that's what I misunderstood. Thanks for the clarification.
>
> 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.
This is too bad. I don't have a RevD here so this very useful info. This
reinforces the need to not mix spectros, even from the same family.
>
> 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.
Not surprised here too. Probably even worse when comparing to an X-Rite
device. Why can't all these spectros agree on something! :(
>
>>
>> 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.
>
I certainly hope X-Rite hears this so it ain't just me asking for this
product. Thank iPhone man. :)
--
Dan B. Reid
RPimaging, INC
Color Management Products and Training for Print, Internet, and Motion
Graphics
http://www.rpimaging.com | Toll Free: (866) RGB-CMYK
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