Re: Epson 4900 Calibration
Re: Epson 4900 Calibration
- Subject: Re: Epson 4900 Calibration
- From: Mike Strickler <email@hidden>
- Date: Mon, 04 Apr 2011 12:59:28 -0700
Much ado about very little. Proofing is the more critical application, and for this a 2 minute drying time is already adequate for the Ultrachrome inks. They hardly change after that--small fractions of a dE. These are not press inks, after all. As for calibration, well, this is not always terribly precise (depending on the hardware and software). It can correct fairly substantial amounts of drift. In general it is best to do this before profiling subsequent recalibrations don't actually make things worse.
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> ------------------------------
>
> Message: 5
> Date: Sun, 03 Apr 2011 20:44:25 -0700
> From: Steve Upton <email@hidden>
> Subject: RE: Epson 4900 Calibration
> To: email@hidden
> Message-ID: <p06240830c9beee526cea@[216.254.4.110]>
> Content-Type: text/plain; charset=us-ascii
>
> At 10:25 AM -0700 4/3/11, Matthew H. Owens wrote:
>> Regarding onboard spectro's, what about the cure time that is necessary for
>> the ink to reach a stable density? For example, with the epson inks,
>> generally overnight is sufficient to wait, but according to data from Epson,
>> it takes about six days till full cure. So until that time the colors will
>> shift. This is the reason I do not use an onboard spectro, and would
>> rather let my ICC swatches dry overnight till scanning. I also scan them
>> again after six days of cure time.
>
> Many fine points have been made but I thought I'd add one I haven't heard yet.
>
> The automated measurement hardware doesn't have to create problems with a lack of delay.
>
> One of the benefits of it being automated is not only that it can perform calibration in the middle of the night, but also that (if your software allows it), you could set the delay for drying to 15 min, a hour, whatever.
>
> That said, calibration is indeed very different that profiling and measuring outside the device after a user-handled delay may certainly be most effective for some.
>
> Regards,
>
> Steve
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