QTR-Quadtone RIP

Paul

I must admit my first attempt was not quite correct and I was amused to note that K (Eboni) did smear a lot when I ran the Spyderprint along it!

I am using the Cyan Position Neutral Cool Photo Black to set the initial ink limit and am using the Light Cyan, Neutral Cool Light Black as the grey (I am currently trying to profile for the Cool tone and will move onto warm next, if there ever is a next!).  I am using Dave Goldenberg's ink descriptor files as a template.

As mentioned I have set the DEFAULT_INK_LIMIT= to values from 70% down to 45%, each and every time I get the same result at the linearisation stage, approx 90% gives the highest density (actually from 2.19 to 2.38 depending on ink limit settings) and 95% and 100% are declining values.

I am wondering whether or not this paper is actually too good at accepting high saturation levels of ink and therefore giving me too high a default ink limit for practical purposes.  Dave's files have an ink limit setting of 32 on Ilford Gold Fibre Silk, which is much lower than indicated by the inkseparation6 prints I am making.  At ink limit 35% I get a density reading of 1.83 for 100% black.  So far with this paper I am getting readings of up to 2.60 on highly saturated steps.

--- In QuadtoneRIP@yahoogroups.com, Paul Roark  wrote:
>
> rossfmj  wrote:
> 
> > **
> >
> >
> > I am having a big problem trying to create a profile for Epson Premium
> > Photo Gloss.
> >
> > Every time I set an ink limit, regardless of value, when it comes to
> > measure a 21 step wedge for linearisation, I find that the last two
> > (darkest value) steps appear to have lower density values than the lighter
> > steps. ...
> >
> Be sure to read http://www.paulroark.com/BW-Info/UT14.pdf
> 
> Note that the K position is matte black, not glossy photo black.
> 
> The C and M inks are types of PK.  They are what you are going to use to
> generate the black, not the MK that is in the K position.
> 
> I'm guessing that is what is going on.
> 
> The LC and LM are Lk-density inks.
> 
> To the extent it is consistent with the tones you want to achieve, use C,
> M, LC and LM.  You can make a cool and a warm profile and mix them with the
> sliders.
> 
> I hope this helps.
> 
> Paul
> www.PaulRoark.com
> 
> 
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>