QTR-Quadtone RIP

Hi David,

The only way to get specific ratios of two inks is to mix the inks by
hand and load the
mixture into one of the ink carts.  The printers only output up to 3
different ink drop sizes
so the printer itself can't do what you are asking for.  Inkjet
printers in general use dithering
to get multiple levels -- your eye does the averaging of a larger area
than one ink drop.

QTR doesn't have a way to correlate positioning of different inks.  In
fact the idea is just
the opposite -- eliminate dot patterns by more randomness of dot placement.

Roy


On Wed, Nov 25, 2009 at 10:00 AM, David <dkfreed@...> wrote:
> Thanks again Joost.
>
> I have already tried the rastus plugin, but didn't get the results I needed. There is another program called Icefields, but it is only for Mac. I'm looking into whether I can run it on my PC using Mac emulator software.
>
> Getting back to my original question, I'd still like to know the settings/curves in QTR, so that each dot of ink laid down is a certain mix of two color inks, say magenta and yellow, or cyan and magenta; so if I printed a bit mapped image the dots of ink would be this color combination, bit the spaces in between would be blank.
>
> Best, David.
>
>
> --- In QuadtoneRIP@yahoogroups.com, "horstenj" <j.h.j.h@...> wrote:
>>
>> David,
>>
>> I use the Andromeda "screens" filter. I notice they changed their website at the expense of a decent explanation. This link:
>>
>> http://www.andromeda.com/main/screengall_screens.php
>>
>> gives some idea. I guess it's the same filter as your call "mezzotint". I use it to create an aquatint-like dithering, which is noticably different than a stochastic dithering. Given the same resolution the aquatint has a coarser, but more natural/artistic feel then a stochastic dithering.
>>
>> If you want stochastic dithering indeed, there are several (free) photoshop plugins that do that.
>>
>> Joost
>>
>>
>> --- In QuadtoneRIP@yahoogroups.com, "David" <dkfreed@> wrote:
>> >
>> > Joost, which Andromeda filter did you use? Is it the mezzotint? I asked them about this, and they said a filter to do what I want is soon to be released, but not available right now. Maybe they don't understand what I want.
>> >
>> > Best, David.
>> >
>> > >
>> > > --- In QuadtoneRIP@yahoogroups.com, "horstenj" <j.h.j.h@> wrote:
>> > > >
>> > > > Hi david,
>> > > >
>> > > > I've made digital positives for photopolymer intaglio prints with QTR with good success.
>> > > >
>> > > >I use andromeda screen filter for this. The result should be a black and white image (no gray tones). The dots are formed in Photoshop, not QTR. Any consideration with respect to percentage coverage of the dithering pattern is to be handled in photoshop, again not in QTR.
>> >
>>
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