Digital BW, The Print

"Terry" <TerryGls@...> wrote:

> Paul, if I understand, looking at the 100% QTR Ink Separation Page for Epson Ultra Premium Luster printed with my R1800 at 2880, uni-directional my "max visual PK black" is at the 60% ink limit.
> 
> So, are you suggesting I use 60% for my PK Ink Limit?...then for Black Boost 65 or 70%?

If the actual dmax is at 70 but the slope of the curve is very low between 60 and 70 -- that is, they are barely separated -- then I'd use 60 as the K limit and put 70 in the black boost box.  (Note that there may be other factors like pizza wheel issues, but I'm not considering that at the moment.)  

One thing I've noticed when I use the boost is that when the relative densities are based on the lower K limit, here 60, the resulting partitioning gives a more linear pre-linearization curve.  

In general, I also tend not to set the limits of the midtones all the way to their max density either.  I use a loupe to see when the bleed starts to become an issue, and I also don't want there to be too much ink particularly on glossy papers.  Frankly, my glossy printing is now black only with HP PK on a 1400.  Drier glossy printing results in fewer pizza wheel issues and reflective artifacts, though the HP PK prints do still show some bronzing.


 
> I've been linearizing using ChartThrob ...

I've never used it.  So, my comments relate only to QTR.

Paul
www.PaulRoark.com