QTR-Quadtone RIP

Howard,
It is my understanding from reading the material that the Ink Separation calibration is a 
printer specific, not paper specific calibration.

I did that calibration before starting the per paper profiling I described.

It is important to remember that that has to be accomplished as well. Thanks for pointing 
it out.

What drove me to doing the detailed profiling I described here is the lack of Dmax with 
the default matte paper selection even after doing the Separation calibration.

Regards,
David


--- In QuadtoneRIP@yahoogroups.com, Howard Shaw <glassman@...> wrote:
>
> This method may work if the best black ink density for the new paper 
> matches that of the paper whose existing profile you use.
> 
> However a better way to optimise dmax and take out some of the guesswork 
> is to standardise on one paper setting & resolution and print one of the 
> ink separation tifs in calibration mode. See the file 'QuadToneRIP User 
> Guide.pdf' in the qtr folder for more details.
> 
> Howard
> 
> 
> dmwket wrote:
> > 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.
> >>
> > 
> > 
> > 
> > 
> > 
> >  
> > Yahoo! Groups Links
> > 
> > 
> > 
> >
>