Hi Steve, Thanks for the response. I'm sure there is variation in how the two spectros calibrate - the tile on the iO table vs. the i1Pro2's tile. And yes, the former does get more dust & needs cleaning fairly frequently. But let me offer a bit more info, maybe this will help clarify my question: For a given media - Epson's Watercolor Radiant White, e.g. - the media WP measured by the original i1Pro *consistently* shows as L*97, and this is across charts measured this year and old ones from as far back as 7 years ago (same WP value even in CMYK profile created for ColorBurst RIP). Measuring the same media last month with my i1Pro2, the media WP reported is L*94. I get similar discrepancies measuring charts on other papers Granted that I haven't had it recertified lately, but it seems like my older spectro is performing pretty consistently, on this single measurement, anyway! My i1Pro2 also seems to be performing as it's supposed to; printing with profiles created with its measurements seems to work as expected. But soft-proofing with those profiles is way off. As I mentioned, I saw another poster on a different list claim that the current version of the software reports WP readings lower than those from same charts, same i1Pro2 spectro, but older version (v.1.3.2?) of i1Profiler. I don't know if this is true, I'm just noticing a problem as above & wonder if anyone else has seen this phenomenon. Oh yes, and both pass i1Diagnostics 4.1.0. Maybe this is unique to my setup, or maybe I'm unique by using both instruments. But it sure looks like more than just standard inter-instrument disagreement... John JWL Images Emeryville, CA On Jul 10, 2014, at 12:00 PM, colorsync-users-request@lists.apple.com wrote:
Message: 3 Date: Wed, 09 Jul 2014 13:16:43 -0700 From: Steve Upton <upton@chromix.com> To: colorsync-users colorsync-users <colorsync-users@lists.apple.com> Subject: Re: White point readings - i1Pro2 vs. original Message-ID: <F25499E0-3A7A-4B01-A26B-D05A1AF0F052@chromix.com> Content-Type: text/plain; charset=us-ascii
On Jul 7, 2014, at 12:41 PM, John Lund <john@jwlimages.com> wrote:
Hello colorsyncers,
I am seeing what looks like a bug in how media white point is reported when driving my i1Pro2 with the current i1Profiler (version1.5.4). Measuring charts of the same paper twice - once with i1Pro2 (MO), then again with my original i1Pro in an iO table - the first reading reports paper white point as L*94, while the second is L*97. This pattern seems to be consistent for the several matte papers I have read lately.
I don't see significant differences in the results of printing with the two profiles, but obviously this effect plays havoc with soft-proofing.
A poster on the Luminous Landscape forums described similar errant readings using an i1Pro2, and claims the problem went away after reverting to i1Profiler v.1.3.
Before I go to that extreme, I wanted to ask here - has anyone else seen this? Is this a bug in the current software? (seems weird that the earlier i1Pro apparently is not affected)
When the i1 is in the iO it uses different calibration patches, is it possible that one of them is really dirty & the instrument is calibrating differently?
regards,
Steve