Digital BW, The Print

Paul,

Are you willing to share you IJC profiles ?

Txs,

Mike


On 21/10/06, Paul Roark <paul.roark@...> wrote:
>
>   This new non-blended ink approach has sat in my 7500 for 2 weeks now.
> So,
> to see how stable the tones were, I printed a test strip, read the patches
> with the PrintFixPro Spectro and graphed the Lab A and B values with
> Excel.
> I've overlaid the graphs, matching the paper white and black points to
> adjust for spectro reading errors to at least some extent. The results are
> posted at
>
> http://home1.gte.net/res09aij/7500_4K+_PA-N1_B_14_Days.jpg and
>
> http://home1.gte.net/res09aij/7500_4K+_PA-N1_A_14_Days.jpg
>
> I'm very pleased with the results. The deviations shown on the graphs are
> close to the expected random errors from different dry times, the spectro
> and other factors.
>
> So, this is the inkset I'll be using in the 7500 for a while. It gives me
> full Lab A and B controls, and appears to be very stable.
>
> The old 7500, with its relatively large and non-variable dots, does show a
> very fine grained dot structure on test strips when viewed with the
> strongest reading glasses. However, for display prints, I think the
> smoothness is fine. Compared to the blended inkset I was using previously,
> the current one is about 15% less smooth according to the average Standard
> Deviation measures of 1600 dpi scans. Again, the fine grained structure of
> the image is essentially irrelevant to me for display prints. The
> stability
> of the tones and full Lab A and B controls are far more important.
>
> So, I'm very happy with this combination at this point.
>
> For the details of the inkset, see below.
>
> Paul
> www.PaulRoark.com
>
> On October 01, 2006 I wrote:
>
> >I'm trying a new inkset in my 7500 as a way to simplify my
> >life and, hopefully, cure the tone shift problem I've
> >experienced in large format printers running dedicated
> >"blended" B&W inksets.
>
> ...
>
> >This approach will only work with a rip, with QTR and IJC being
> >the logical ones for most B&W printers.
>
> >Currently, this is what I have loaded in the 7500 (source
> >of ink in parentheses), and I think it will for fine for
> >all 7000 and 7600 generation printers:
>
> > 4 k's:
>
> > - MK (MIS - Eboni),
>
> > - PK (now MIS, may be Epson later),
>
> > - LK (MIS),
>
> > - LLK (MIS);
>
> Plus colors:
>
> > - Light Cyan -- 50% MIS Light Cyan, 50% clear base for 7500;
>
> > - LM (Epson UC, may be Epson Archival later).
>
> > There are no blends of more than one type of pigment in any ink.
> > As such, the inkset should be relatively easy to profile and
> > should have the least amount of color drift between printing sessions.
>
> > All inks can be off-the-shelf and from multiple sources. For
> > the 7500, however, I do think the lighter 50% LC ("LLC"?)
> > is worth the effort for smoother highlights. It's an easy
> > 1:1 mix of readily available and compatible cyan pigment and
> > clear base [or Glop]. MIS's cyan pigment appears to be very good.
>
> > With both MK and PK loaded, I can print on either matte or glossy paper.
>
> ...
>
> 
>


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