QTR-Quadtone RIP

Just for curiosity: I assume QTR's settings for stock Epson K3 inks incorporate less color ink than the Epson ABW driver does. Is this the case? And is there a way to say how much less, eg "none" under certain conditions? 

Related, is there any assessment of the longevity of the QTR/Epson K3 print, vs the Epson ABW print, vs Piezography neutral K7 inks?  Thanks!

 No doubt this has been covered somewhere/sometime in the past, so apologies if the topic is exhausted. Some searching here and on the qtr site and I couldn't find a specific answer.

all you have to do is drag the curves you use into QTR-CurveView, and you will see the exact content of each color. Usually, people designing curves for QTR tend to make the "warm" curve out of only the black and light black inks, then introduce whatever color is required or desired to make the other more tinted curves.
Tyler

--- In QuadtoneRIP@yahoogroups.com, "jespes" <jesse.pesta@...> wrote:

>
> Just for curiosity: I assume QTR's settings for stock Epson K3 inks incorporate less color ink than the Epson ABW driver does. Is this the case? And is there a way to say how much less, eg "none" under certain conditions? 
> 
> Related, is there any assessment of the longevity of the QTR/Epson K3 print, vs the Epson ABW print, vs Piezography neutral K7 inks?  Thanks!
> 
>  No doubt this has been covered somewhere/sometime in the past, so apologies if the topic is exhausted. Some searching here and on the qtr site and I couldn't find a specific answer.
>

From an older discussion here I recall that the 2400 ABW mode still used quite some yellow that in turn had to be compensated by extra amounts of cyan and magenta. Paul Roark addressed that point. In the QTR curves yellow is usually avoided altogether. As Tyler points out, QTR warm curves are carbon only. Cool (and selenium) curves contain some cyan and magenta.  

Joost

--- In QuadtoneRIP@yahoogroups.com, "jespes" <jesse.pesta@...> wrote:

>
> Just for curiosity: I assume QTR's settings for stock Epson K3 inks incorporate less color ink than the Epson ABW driver does. Is this the case? And is there a way to say how much less, eg "none" under certain conditions? 
> 
> Related, is there any assessment of the longevity of the QTR/Epson K3 print, vs the Epson ABW print, vs Piezography neutral K7 inks?  Thanks!
> 
>  No doubt this has been covered somewhere/sometime in the past, so apologies if the topic is exhausted. Some searching here and on the qtr site and I couldn't find a specific answer.
>

"horstenj" <j.h.j.h@...> wrote:
>
> ... the 2400 ABW mode still used quite some yellow that in turn had to be compensated by extra amounts of cyan and magenta. Paul Roark addressed that point. In the QTR curves yellow is usually avoided altogether. As Tyler points out, QTR warm curves are carbon only. Cool (and selenium) curves contain some cyan and magenta.  ...

Both the Epson ABW and HP neutral PK & gray inks use a cocktail of carbon, C,M and Y.  One could argue that Epson puts in the Y for smoothness.  I speculated initially that they may also be using it for a "counter shift" strategy, similar to what I did with the original MIS FSN.  The concept is to put in a little fast-fading yellow to offset the warm shift.  Yellow has a unique characteristic that it is high gamut, but low density.  So, its fading has less impact on the density reduction than on color.

Now that the HP ink is also doing the same thing as Epson ABW and the Aardenburg-Imaging fade tests are giving me the data to more clearly see how the OEM inks fade, I think it's rather certain that the yellow is in there, in part with Epson and 100% with HP, as part of a counter-shift strategy. 

So, with the yellow in there, the OEM B&W or neutral images often actually get a bit cooler as they fade -- initially.  The net result is that they will initially warm less than a QTR print that omits the yellow.  How long this will happen is unknown.  Ultimately, the QTR print will fade less and the OEM ABW will be just as warm.  That is, the yellow counter fade strategy only works until the yellow is rather depleted.  The OEMs simply calculate that this is long enough that no one will care that the alternative of no yellow ultimately wins.  They may be right.

Paul
www.PaulRoark.com

Paul,

Back to question fo the topic starter: do you have any insight in the AMOUNT of color ink vs gray ink used by EPSON in their ABW setting?

Joost

depends on the ABW settings :) ... but at neutral quite a bit of yellow and
magenta to warm up the ink. Easiest way to see what's happening is to scan a
print. Mike

2010/1/18 horstenj <j.h.j.h@...>

>
>
>
> Paul,
>
> Back to question fo the topic starter: do you have any insight in the
> AMOUNT of color ink vs gray ink used by EPSON in their ABW setting?
>
> Joost
>
>  
>


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