QTR-Quadtone RIP

A good approach would be to purchase a unit with a calibration plaque
included. Even better would be to get one with a calibration plate that is
still current. Mine came with 2 plates (for reflective measurement) and a
film for transmissive measurement. All the calibration items were past their
expiry dates. I've used them anyway and I've been happy with the results.

If you get a unit without calibration plate you can buy one from xrite. I
don't remember the price other than they're fairly expensive. The reflective
calibration plates are metal with what looks like an enamel surface. They
have a data sheet giving their measurement values used in the calibration
process. Although there is a gray patch, only the black and white are used
for the calibration. If you're thinking of a do-it-yourself calibration
strip, you'll need to measure the strip with a device known to be
calibrated. The strip would then have to be stable over time and sturdy
enough to survive repeated use.

As a more flexible alternative buying an 810 and a patch, you might want to
consider the PrintfixPRO package. It does everything the 810 does as far as
supporting QTR is concerned, plus it also measures colour, creates ICCs for
colour ink sets and calibrates your monitor too. Of course PrintFIX doesn't
do transmission densitometry.

Tom Moore

> -----Original Message-----
> From: QuadtoneRIP@yahoogroups.com [mailto:QuadtoneRIP@yahoogroups.com] On
> Behalf Of Mike Dawson
> Sent: Sunday, January 21, 2007 10:49 PM
> To: QuadtoneRIP@yahoogroups.com
> Subject: [QuadtoneRIP] X-Rite 810 densitometer
> 
> I'm looking to purchase the x-rite 810 densitometer to aid in creating
> paper/ink profiles for QTR.  My question has to do with the
> calibration strips that come with the unit.
> 
> If I find a good looking unit but it doesn't have the calibration
> strips, especially the reflective strip, how do I calibrate the unit?
>  Is there a simple standard that can be obtained elsewhere?  From what
> I have seen the 810 calibrates for reflectance based on a "black", a
> "white", and a "gray" patch.  Seems like these might be easy to come by.
> 
> Mike
> 
> 
> 
> 
> Yahoo! Groups Links
> 
> 
>