Digital BW, The Print

Howdy All!

I am trying to convert a .acv curve to QTR curve.


I've gotten as far as creating the raw 16 bit file with the .acv curve
applied, and I understand the basics of the example in the getting
started file:

eg:  qacvraw   cmyk-16.raw  2  >magenta.out

here are my questions:
1. do you run this for each channel?
2. what happens next, where/when do I reassemble the four new channel
files into one curve to select in the dropdown list..?

in general, is anyone having success yet with QTR and a 2000P?

Thanks, 
Tom De Carlo

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Tom " <pouty_bob@y...> 
wrote:
> Howdy All!
> 
> I am trying to convert a .acv curve to QTR curve.
> 
> 
> I've gotten as far as creating the raw 16 bit file with the .acv curve
> applied, and I understand the basics of the example in the getting
> started file:
> 
> eg:  qacvraw   cmyk-16.raw  2  >magenta.out
> 
> here are my questions:
> 1. do you run this for each channel?
> 2. what happens next, where/when do I reassemble the four new channel
> files into one curve to select in the dropdown list..?
> 
> in general, is anyone having success yet with QTR and a 2000P?
> 
> Thanks, 
> Tom De Carlo

Hi Tom,

It looks like you are getting down into the guts of putting curves together.
If what you want to do is completely do all the curve design that is fine.  The
disadvantage is that you bypass all the other features in the profile generator.

So to answer your questions:
1) Yes, you need to make a curve for each separate ink channel.  With a 4 ink
printer one cmyk.raw file will do.  With more channels I'd suggest one cmyk
for the dark inks and one for the light inks.

2) Once you have individual files for each of the channels you need to merge
them together with qmerge to make a full curve set (i.e. a .quad file) and
place it into the correct CurveDropBox subfolder and run the install curves script.

All this is a bit tedious so its best done in a shell script.  If this is at least
somewhat familiar you should check out the quadprofile script in /usr/local/bin
and see an example of how this is done.

Roy

Howdy Roy!

I should have guessed that 'qmerge' made the most sense!!!

so I guess I missed something about the profile generator, because I
thought converting existing curves that I know work well would be a
quick solution compared to starting from scratch.

I will go back and look for what I missed!

Thanks,

Tom



--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Roy Harrington"
<roy@h...> wrote:
> --- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Tom "
<pouty_bob@y...> 
> wrote:
> > Howdy All!
> > 
> > I am trying to convert a .acv curve to QTR curve.
> > 
> > 
> > I've gotten as far as creating the raw 16 bit file with the .acv curve
> > applied, and I understand the basics of the example in the getting
> > started file:
> > 
> > eg:  qacvraw   cmyk-16.raw  2  >magenta.out
> > 
> > here are my questions:
> > 1. do you run this for each channel?
> > 2. what happens next, where/when do I reassemble the four new channel
> > files into one curve to select in the dropdown list..?
> > 
> > in general, is anyone having success yet with QTR and a 2000P?
> > 
> > Thanks, 
> > Tom De Carlo
> 
> Hi Tom,
> 
> It looks like you are getting down into the guts of putting curves
together.
> If what you want to do is completely do all the curve design that is
fine.  The
> disadvantage is that you bypass all the other features in the
profile generator.
> 
> So to answer your questions:
> 1) Yes, you need to make a curve for each separate ink channel. 
With a 4 ink
> printer one cmyk.raw file will do.  With more channels I'd suggest
one cmyk
> for the dark inks and one for the light inks.
> 
> 2) Once you have individual files for each of the channels you need
to merge
> them together with qmerge to make a full curve set (i.e. a .quad
file) and
> place it into the correct CurveDropBox subfolder and run the install
curves script.
> 
> All this is a bit tedious so its best done in a shell script.  If
this is at least
> somewhat familiar you should check out the quadprofile script in
/usr/local/bin

> and see an example of how this is done.
> 
> Roy

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Tom " <pouty_bob@y...> 
wrote:
> Howdy Roy!
> 
> I should have guessed that 'qmerge' made the most sense!!!
> 
> so I guess I missed something about the profile generator, because I
> thought converting existing curves that I know work well would be a
> quick solution compared to starting from scratch.
> 
> I will go back and look for what I missed!
> 
> Thanks,
> 
> Tom
> 

Tom,

If you're thinking of using existing curves from version 1.1, they
probably won't be good for 2.0.  The 2.0 system runs at a much
lower raw level that affords more accurate control but that also
means that it's different.

Roy