QTR-Quadtone RIP

--- In QuadtoneRIP@yahoogroups.com, "Paul Roark" <paul.roark@...> wrote:
>
> 
> > > The workflow that I think is easiest for people to start with is the
> > > Epson driver. ...
> 
> > This is very easy to use, ...
> > ... I wondered how to warm up the print or cool it down. 
> 
> > ... if I wanted to "cool" the b&w tone, would I raise the 
> > "Cyan" slider on the epson driver up to achieve this? 
> 
> The sliders have some control, but I think they are rather
ineffective and
> often result in poor linearity of the output.  I recommend Photoshop
curves,
> dropped into ICCs as the best way to control print tones with the Epson
> driver.  I've provided some curves for this that should work for
most matte
> papers. You can see the range of tones these curves cover on page 6 of
> http://www.paulroark.com/BW-Info/UT14.pdf 
> 
> To make the ICCs, see
> http://www.paulroark.com/BW-Info/Embedding_Photoshop_Curves_in_ICCs.pdf 
> 
> Of course, QTR rip could also be used to accomplish the same thing.
 It's
> just a matter of which workflow you're most comfortable with.
> 
> > My other confusion is to how the yellow channel works. 
> >I know in the yellow position there is GLOP. I am aware 
> > that I use Ultra Premium Pres Matte paper at all time 
> > (or watercolor), but how do I tell the driver to use glop/yellow?
> 
> For matte papers the Glop is largely irrelevant and not used --
except to
> turn on the black ink.  (Actually, I do use it some in the warm curve
> because it does warm matte papers a bit.)  In RGB curves in PS, the
black
> ink is turned on as all the curve approach 100%.  So, you'll see the
blue
> curve moving sharply toward the black point at that end of the graph.
> 
> The Blue curve in the PS curves controls the yellow ink.  You have
to think
> in complementary colors: Red curve controls cyan ink position, Green -
> Magenta, Blue - Yellow.
> 
> > if I want to use glossy paper then my thinking is I
> > need to use the ICC profiles (which I have no issue with).
> > But that again brings me to the point of using the Photoshop curves. 
> > Do I just apply the curve to the grayscale photo, then click on 
> > print with No color adjustments for a glossy print? Or do I use 
> > the ICC profile?
> 
> You can apply the curves directly to an RGB version of the grayscale
file.
> The ICCs are essentially doing this.  When you print a grayscale
file with
> one of these ICCs, they convert it to RGB and apply the curve. 
However, the
> ICCs also do some other important things.  They linearize the output and
> make the output match the monitor.
> 
> > ... I have a calibrated monitor, and use ICC profiles for every
paper ...
> 
> Being able to make your own ICCs is a real plus.  Once you've made a few
> with QTR, you'll find they are very easy.  It makes an excellent
workflow.  
> 
> Paul
> www.PaulRoark.com
>

I don't have a scanner or any other device to use to measure with,
will I still be able to drop the curves into the ICC's? I have never
heard of doing this so forgive my questions. I actually use some of
the papers that have profiles already.

I could always print the test strip out and send it to someone to
measure for me ;)