QTR-Quadtone RIP

I've noticed that I'm getting way too much ink coming down on HPR 308
with the current canned k7 profiles for the newest version of QTR. I
would like to refine the K limit. Anyone have the print definition file?

thanks, Walker Blackwell

Hi Walker,

Im surprised your having too much ink load with PR. I am facing that
issue today with profiling the Crane Portfolio Rag with Sepia K6. I
kept limiting, and limiting, and limiting in QTR until the last two
patches don't reverse. I ended up with limiting 40% in the advanced
adjustments box of QTR. That did it. You can save that as a preset
along with curve created for it.

john



--- In QuadtoneRIP@yahoogroups.com, "Walker Blackwell"
<wblackwell@...> wrote:

>
> I've noticed that I'm getting way too much ink coming down on HPR 308
> with the current canned k7 profiles for the newest version of QTR. I
> would like to refine the K limit. Anyone have the print definition file?
> 
> thanks, Walker Blackwell
>

Yeah. I just built my own k7 profile for QTR with more limiting. The only
problem is that it's now only printing 2 inks in the darkest patches instead
of the 5 or 6 that the Cone profiles have. That's what makes the Cone
profiles great but also somewhat finicky. I'm figuring out a way to do more
underprinting. It might not happen though . . .

Anyone know of a way to do linearization per channel? Basicly I'm trying to
custom curve each channel in order to control exactly what ink goes where.

take care, Walker


[Non-text portions of this message have been removed]

Hi Walker. Try going over to the B&W Print group and search on Paul
Roark. He has a method of inputting curves to QTR b&w ICCs that might
work for you in linearizing. At least, it sounds like that is what you
need. He uses it to linearize custom ink mixes from Photoshop curves.

Regards
Duane


--- In QuadtoneRIP@yahoogroups.com, "Walker Blackwell"
<wblackwell@...> wrote:
>
> Yeah. I just built my own k7 profile for QTR with more limiting. The
only
> problem is that it's now only printing 2 inks in the darkest patches
instead
> of the 5 or 6 that the Cone profiles have. That's what makes the Cone
> profiles great but also somewhat finicky. I'm figuring out a way to
do more
> underprinting. It might not happen though . . .
> 
> Anyone know of a way to do linearization per channel? Basicly I'm
trying to
> custom curve each channel in order to control exactly what ink goes
where.

> 
> take care, Walker
> 
> 
> [Non-text portions of this message have been removed]
>

Hi Walker, something I've always wanted in both QTR and StudioPrint is
access to the partitioning curves. I think the problem is that it's
something most people will simply not need, or if they mess with it
will wind up with unnecessary problems. So I'm sure it's a feature
that would be difficult to include, and wind up becoming a support
problem, just so that one person out of a thousand can make use of it.
You have to hand it to them both, the built-ins work awfully well.
Actually I think there is access for QTR, since Jon and the
MediaStreet Quad developer both made their own. But it's beyond my
limited brain power. I think it involved editing LUTs in Photoshop.

So, I think your best option is IJC, and our friends Scott and Bill
could enlighten you to it's use a great deal. Pretty sure you can
literally draw your own curves.
I keep meaning to try it, let us know of you do.
Tyler


--- In QuadtoneRIP@yahoogroups.com, "Walker Blackwell"
<wblackwell@...> wrote:
>
> Yeah. I just built my own k7 profile for QTR with more limiting. The
only
> problem is that it's now only printing 2 inks in the darkest patches
instead
> of the 5 or 6 that the Cone profiles have. That's what makes the Cone
> profiles great but also somewhat finicky. I'm figuring out a way to
do more
> underprinting. It might not happen though . . .
> 
> Anyone know of a way to do linearization per channel? Basicly I'm
trying to
> custom curve each channel in order to control exactly what ink goes
where.

> 
> take care, Walker
> 
> 
> [Non-text portions of this message have been removed]
>

Walker

Not sure if this is what you mean but I came up with a way of 
controlling each channel separately using .acv curves in qtr.
See
http://www.howardshaw.org/docs/k7-qtr/k7curves.htm

Howard

Walker Blackwell wrote:

> Yeah. I just built my own k7 profile for QTR with more limiting. The only
> problem is that it's now only printing 2 inks in the darkest patches instead
> of the 5 or 6 that the Cone profiles have. That's what makes the Cone
> profiles great but also somewhat finicky. I'm figuring out a way to do more
> underprinting. It might not happen though . . .
> 
> Anyone know of a way to do linearization per channel? Basicly I'm trying to
> custom curve each channel in order to control exactly what ink goes where.
> 
> take care, Walker
> 
> 
> [Non-text portions of this message have been removed]
> 
> 
> 
>  
> Yahoo! Groups Links
> 
> 
> 
>

Good points. I think I'm probably too busy at the moment to bang my  
head against the wall for the next few months drawing curves anyway.

more later, W

hmm, cool, looks like the answer..
Tyler

--- In QuadtoneRIP@...m, Howard Shaw <glassman@...> wrote:
>
> Walker
> 
> Not sure if this is what you mean but I came up with a way of 
> controlling each channel separately using .acv curves in qtr.
> See
> http://www.howardshaw.org/docs/k7-qtr/k7curves.htm
> 
> Howard
> 
> Walker Blackwell wrote:
> > Yeah. I just built my own k7 profile for QTR with more limiting.
The only
> > problem is that it's now only printing 2 inks in the darkest
patches instead
> > of the 5 or 6 that the Cone profiles have. That's what makes the Cone
> > profiles great but also somewhat finicky. I'm figuring out a way
to do more
> > underprinting. It might not happen though . . .
> > 
> > Anyone know of a way to do linearization per channel? Basicly I'm
trying to
> > custom curve each channel in order to control exactly what ink
goes where.

> > 
> > take care, Walker
> > 
> > 
> > [Non-text portions of this message have been removed]
> > 
> > 
> > 
> >  
> > Yahoo! Groups Links
> > 
> > 
> > 
> >
>

Indeed. Thank you Howard.

On May 22, 2007, at 6:11 PM, Tyler Boley wrote:

> hmm, cool, looks like the answer..
> Tyler
>
> --- In QuadtoneRIP@yahoogroups.com, Howard Shaw <glassman@...> wrote:
> >
> > Walker
> >
> > Not sure if this is what you mean but I came up with a way of
> > controlling each channel separately using .acv curves in qtr.
> > See
> > http://www.howardshaw.org/docs/k7-qtr/k7curves.htm
> >
> > Howard
> >
> > Walker Blackwell wrote:
> > > Yeah. I just built my own k7 profile for QTR with more limiting.
> The only
> > > problem is that it's now only printing 2 inks in the darkest
> patches instead
> > > of the 5 or 6 that the Cone profiles have. That's what makes  
> the Cone
> > > profiles great but also somewhat finicky. I'm figuring out a way
> to do more
> > > underprinting. It might not happen though . . .
> > >
> > > Anyone know of a way to do linearization per channel? Basicly I'm
> trying to
> > > custom curve each channel in order to control exactly what ink
> goes where.
> > >
> > > take care, Walker
> > >
> > >
> > > [Non-text portions of this message have been removed]
> > >
> > >
> > >
> > >
> > > Yahoo! Groups Links
> > >
> > >
> > >
> > >
> >
>
>
> 



[Non-text portions of this message have been removed]

OK, I'll bite, what are .acv files and how do you use them?
Steve

On Tue, 22 May 2007 16:11:04 -0700, Tyler Boley <tyler@...>  
wrote:

> hmm, cool, looks like the answer..
> Tyler
>
> --- In QuadtoneRIP@yahoogroups.com, Howard Shaw <glassman@...> wrote:
>>
>> Walker
>>
>> Not sure if this is what you mean but I came up with a way of
>> controlling each channel separately using .acv curves in qtr.
>> See
>> http://www.howardshaw.org/docs/k7-qtr/k7curves.htm
>>
>> Howard


-- 
Using M2, Opera's revolutionary e-mail client: http://www.opera.com/m2/

.acv files are what you get when you save a curve shape in Photoshop.

In QTR, if you select 'Load Curve' against an ink & then click the Curve 
button you can type in the path to your .acv file. That curve will be 
then be used by qtr to control the densities of that channel.

There was a thread on this a few months ago when it was also pointed out 
that linearising such a set of curves could be problematic unless you 
really know what you are doing. Nonetheless, as Tyler pointed out, this 
does seem to be akin to the method of curve generation used in Bowhaus IJC.

regards
Howard

Steve and Ann Taylor wrote:

> OK, I'll bite, what are .acv files and how do you use them?
> Steve
> 
> On Tue, 22 May 2007 16:11:04 -0700, Tyler Boley <tyler@...>  
> wrote:
> 
>> hmm, cool, looks like the answer..
>> Tyler
>>
>> --- In QuadtoneRIP@yahoogroups.com, Howard Shaw <glassman@...> wrote:
>>>
>>> Walker
>>>
>>> Not sure if this is what you mean but I came up with a way of
>>> controlling each channel separately using .acv curves in qtr.
>>> See
>>> http://www.howardshaw.org/docs/k7-qtr/k7curves.htm
>>>
>>> Howard
> 
>

That WAS the answer. Just got it working. Sweet lord! :-)

Walker