QTR-Quadtone RIP

I have an X-Rite 810 that I bought off Ebay. I paid about $150 for it about
a year ago. That included several alignment step tablets. They may be
cheaper today.

I also have an Epson 2400 scanner and a Fauste IT-8 calibration chart. With
Vuescan I can calibrate the scanner using the IT-8 chart.

I have tried making curves with the scanner and using the densitometer.
Aside from the convenience of being able to import density values directly
into a spreadsheet from the densitometer (important if you do a lot and
value your time), the scanner seems to lack precision near the ends of the
greyscale. The dark patches in particular don't measure the same when
measured with the scanner as they do when measure with the densitometer. 

Perhaps I didn't work at it enough. I know Paul Roark's web site (see the
BlackandWhitethePrint list) has a procedure for "calibrating" your scanner
that might be applicable to those using one to build QTR curves.

The possible benefits that Profile Prism might provide would be
1.	better calibration of the scanner
2.	automation of entry of step density values into a file in a form
usable by QTR

As a densitometer, the X-Rite 810 only measures the L axis. It doesn't
provide any useful a and b axis information (in Lab terms). Using PP might
be a cheap way to get tone information into ICC profiles created by QTR - as
opposed to the Eye-1 at $800.

Tom Moore