QTR-Quadtone RIP

Alan,
Linearization is done on a per paper basis.

It is the profile used by QTR for that paper.

Based on experimentation and reading here on this forum I arrived at the following 
process;

1) Select an existing profile text file that approximates the paper you want to profile and 
delete the Linearization line at the end of the file and save with a unique name.

2) find the best Dmax by printing 100% black squares with several paper settings i.e. 
Premium Gloss Photo Paper, Premium Luster Photo Paper, etc. at 1440 as well as 2880 
using the file you created in 1 for the curve.

I positioned the ink swatch on the paper by clicking center image off and then setting a 
margin to create a row of swatches at the various setting.

These samples are all printed with No Color Management set in the printer dialog.

This is tedious but important. I let the samples dry for about 2 hours before reading them 
with my Spyder Spectrometer.

3) Once the best Dmax paper, resolution setting is found. use that paper and resolution to 
print the 21 X 4 step wedge using the curve created in 1.

4) Let the test print dry for a minimum 2 hours, over night is optimum, then read it and do 
the linearization.

5) Copy the Linearization line from the text file and paste it into the file you made in 1 
above and save the file as your curve file for the paper.

6) Copy the file into the printer profiles folder and "install the printer".

7) Once the curve is installed I save a preset for QTR that has the paper selection, 
resolution setting and curve. I name the preset to reflect what paper it is to simplify my 
printing.


Trust this helps.

There may be a better way to do this that someone more experienced can offer.

Have fun learning QTR --- the B&W prints it produces are great.

Regards,
David

--- In QuadtoneRIP@yahoogroups.com, "handyman856" <avr@...> wrote:
>
> Is linearization done on a 'per printer' basis, done once with any
> paper for a given printer, or is done 'per paper', and part of the
> profiling process of each paper?
> 
> =Alan R.
>