Datacolor User to User Support Group.

John, we reprofile about once every 60 days, or if there's something that
has changed beyond the typical ink cartridge or roll of media, such as a
service call.

This seems to be enough to handle the variation in media lots, ink lots, and
also keeps us in check with the studio temp/humidity.  

My studio is in an old house without air conditioning, and steam heat
radiators.  Even though I use humidifiers in the winter and a floor-standing
air conditioner/dehumidifier, the swing in temp/humidity between winter and
summer is pretty extreme, and definitely affects printer performance.  I'm
envious of anyone that has a nicely controlled environment...  

If you're reading the 729 patch with the PrintFix Pro spectro, it obviously
takes some time, so you might want to adjust your frequency based on the
time you need to do a new profile.

As to multi-sheet patch sets, I would strongly suggest making sure all the
sheets have been allowed to completely dry, maybe even overnight.  Of course
it depends on the media/ink combination, but if you do the first sheet right
out of the printer, and continue from there, you're likely to have some
slightly inaccurate color points  in the profile.

Calibrating your spectro can be done anytime, in theory.  CDTobie can
probably tell you the amount of drift, but I wouldn't think it is enough to
have to recalibrate the spectro between each sheet, I would read the entire
profile just after calibrating the device.  Other than that, there should be
no reason you can't calibrate as often as you want, certainly from day to
day.  

I used to use Kodak Colorflow for building profiles, and when the software
started up it would tell me if it had been over 6 hours, and it wouldn't
proceed without spectro calibration.  I don't know where they got the 6-hour
thing, but is a reference point of some kind.  (this was with X-rite dtp-41)

Just my 2 cents...  your mileage may vary.

-kris


> -----Original Message-----
> From: colorvision_group@yahoogroups.com 
> [mailto:colorvision_group@yahoogroups.com] On Behalf Of John Vitollo
> Sent: Monday, February 27, 2006 10:24 PM
> To: colorvision_group@yahoogroups.com
> Subject: [colorvision_group] Is there a ball park time limit 
> in between calibrations?
> 
> Is there a ball park time limit in between calibrations?
> 
> As an example if I print out the three sheet 729 patch 
> target, is there a accuracy problem measuring the first 
> target and then measuring the next target 10-20 minutes later? 
> 
> Would I need to calibrate the spectro before each target if a 
> reasonable time has past?
> 
> Thanks,
> 
> John V
> 
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