Re: Isis ver dtp-70
Re: Isis ver dtp-70
- Subject: Re: Isis ver dtp-70
- From: Klaus Karcher <email@hidden>
- Date: Sat, 21 Jul 2007 16:05:03 +0200
Klaus Karcher wrote way back:
I'd be very pleased with real-world comparisons between iSis and DTP70.
Even if one can not measure exactly the same target with both
instruments, it should be possible to distinguish between repeatability
errors and systematic differences in the following way:
[see <http://lists.apple.com/archives/colorsync-users/2007/Mar/msg00028.html>]
Derek Lambert wrote:
If someone is more interested I will measure the same target twice in
Isis and in dtp-70 and will post actual results from measure tool.
Derek, if you would be so kind as to take on the printing and
measurement part I will perform the evaluation and post the results.
Derek sent me these files, but I never brought home what I promised. --
only a part of it:
Klaus Karcher wrote in a PM to Derek:
Dear Derek,
you wrote:
I measured all those charts for you.
Many thanks for your effort!
I just want to give you a brief, preliminary résumé of my evaluation
(see attachment), more detailed analyses will follow soon.
[a walloping lie as we know today ;-)]
you can find the attachment mentioned above here:
<http://digitalproof.info/colorsync-users/iSis/resume-1.pdf>
[...] I got enough data to discover some
very interesting and partly astonishing results. Above all the
comparison with the UV-Cut data showed some surprising facts:
- the repeatability of the iSis is excellent (makes i1 Rev A users like
me jealous ;)
- also the short-time repeatability of the EPSON is awesome, even better
than the repeatability of the iSis and much better than the
repeatability of the DTP70 (the difference between the prints nearly
disappears in the noise of the DTP70)
- there are significant differences between the iSis and the DTP70
(mean/max DE00 0.62 / 2.09). Even if you subtract the printer
repeatability error, the remaining differences are remarkable. This
raises the question which of both is closer to the reality ;)
- the differences between the instruments *increases* if you use the UV
Filter! I suspect the UV Filter of the DTP70 of causing systematic color
shifts, but I have to go further into that question.
so long, Klaus
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