QTR-Quadtone RIP

--- In QuadtoneRIP@yahoogroups.com, "Tyler Boley" <tyler@...> wrote:
>
> Unless you are making your own ink setups and profiles for 1440, and
> directly comparing to your results from your own ink setups and
> profiles made similarly at 2880, results won't mean much.
> Only 2880 curves were provided, while using them at 1440 may work, 
but
> it will undoubtedly not be linearized optimally.
> Tyler
> 
> --- In QuadtoneRIP@yahoogroups.com, "Kathleen Duxbury" <kd@> wrote:
> >
> > Yes, you are right, As I am new to the Piezo inks I will need to 
do 
> > more tests.
> > But I did see a difference with more detail in the highlighted 
areas 
> > using the 2880. 
> > Thank you.
> > Kathleen
> > 
> > --- In QuadtoneRIP@yahoogroups.com, "c1asia" <c1asia@> wrote:
> > >
> > > --- In QuadtoneRIP@yahoogroups.com, "Kathleen Duxbury" <kd@> 
wrote:
> > > >
> > > > Roy & Richard, 
> > > > This is also something that that I too would like to 
understand 
> > > > better.  
> > > > Just this week I've started using the Piezography K7 Selenium 
> > inks 
> > > > with the Hahnemuhle Photo Rag paper on an Epson 2200.
> > > >   Tests with 1440 super and 2880, on close inspection, did 
show 
> > > more 
> > > > detail in the highlights with the 2880.
> > > > Because of the number of prints I need at this time and the 
$$ 
> > of 
> > > > ink I chose to use the 1440 super setting.
> > > >   For future use would you make suggestions as to INK LIMITS, 
> > how 
> > > > would I know what adjustments, settings to make? 
> > > > 
> > > > Thank you and best regards.
> > > > Kathleen    
> > > > 
> > > 
> > > i've read somewhere that one advantage to 2880 is a higher dmax 
> > with 
> > > more ink in the shadow areas.  don't know if that principle 
only 
> > > applies to certain papers and inks and if piezo k7 selenium 
would 
> > > respond or not but it sounds like a reasonable hypothesis.  you 
> > just 
> > > need to do some testing, i guess.
> > >
> >
>



that's an interesting point, tyler.  thanks.  hadn't occurred to me 
that curves would be different for the two output resolutions.  makes 
sense.  does that also mean that any other changes to settings would 
require custom curves as well (e.g., rendering intent, 
unidirectional, gray gamma, etc.)?  or are we splitting hairs on some 
of these?  i guess i should ask, which settings are the sensitive 
ones that requires a custom curve?  the canned profiles provided by 
paper manufacturers, are most of these 1440 or 2880?  i guess there's 
no way of knowing what settings they're using when they developed 
these, huh?