QTR-Quadtone RIP

I was wondering if you could use QTR to create a profile that would
only use one ink (black, yellow, magenta, whatever).

I am not necessarily thinking along the lines of "black-only" printing
(although "magenta-only" might be interesting), but rather as a way to
purge a particular ink without having to purge all inks.

If it can be done, does anyone have any suggestions on how to do it?
Thanks.

The least error prone way of doing this from photoshop is to use the calibration image and 
the calibration mode for printing.

What I usually do is just make a large rectangle of the color(s) I want to purge.  Use the 
color sampler to pick the color off the calibration target,  then do a fill of the rectangle 
with  that color. Often you want the color from the 80%  density.  On cheap paper you 
might need less ink,  say 50%.  Finally print using the calibration setting in the QTR driver 
panel.

The only thing to be careful about is to be sure that the color space of  the file you create 
exactly matches that of the calibration image. You don't want any color conversions when 
you fill with the calibration color.

I've had good luck with this method. Hope it helps.

ccolbertbw

--- In QuadtoneRIP@...m, "momoinu_dc" <LotusM50@...> wrote:

>
> I was wondering if you could use QTR to create a profile that would
> only use one ink (black, yellow, magenta, whatever).
> 
> I am not necessarily thinking along the lines of "black-only" printing
> (although "magenta-only" might be interesting), but rather as a way to
> purge a particular ink without having to purge all inks.
> 
> If it can be done, does anyone have any suggestions on how to do it?
> Thanks.
>

>I was wondering if you could use QTR to create a profile 
> that would only use one ink (black, yellow, magenta, whatever).

In the Curve Creator (Tools>Curve Creation), I go to the "color" I'm
interested in, use the drop-down menu and click on Load Curve.  Then click
on the Curve button that is in what was the Density column.  In the box that
appears, click on the Point List tab.  I then make a straight line curve
from 0 to 100 simply by entering the coordinates (0, 0) as the first pair
and then (100, 100) as the second point. If you preview the curve you'll see
a straight line between those points.  Set the ink limit to 100.

I make these for black as well as whatever color I'm interested in.  I
usually name them, for example, K-0-100. 

Then to purge that color, simply print a block of 100% black.

I use these with 21-step test files to see the density range of particular
inks without having to wait for an entire Calibration mode print to be made.

Paul
www.PaulRoark.com