Digital BW, The Print

Martin,

It sure looks like your graph of my test data.

Note also the name of the new ink.  Then note my message in the B&W Print
forum:
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      From:  "Paul Roark" <paul.roark@v...>
      Date:  Mon Aug 5, 2002  7:43 pm
      Subject:  Re: [Digital BW] PiezoTone-PhotoRag 306 Hr. Fade test




      Richard,

      Sorry for the delayed response, but I've been out of town.

      You wrote:

      >Saturday, July 27, 2002, 8:50:38 AM, Paul Roark wrote:

      >PR> The super inkset, in my view, would be the PT midtones with the
MIS FS
      >PR> black.

      >From reading your charts it seems the MIS FS-N black has less warming
      >and fading than the MIS FS black so why not the PT midtones and the
      >MIS FS-N black? Or are the MIS FN black and MIS FS-N blacks the same
      >(as I think perhaps I had heard here before?)?

      The FS-N, FS, and VM blacks are all the same. If you compare one test
set
      with another, there may be differences in results. The paper makes a
big
      difference. Also, however, there may be minor differences from one
test
      session to another.

      >Also, if one sets up a CFS with the PT midtones and the MIS FS (or
      >FS-N) black would there need to be any adjustments in the drives and
      >curves used? i.e. if I currently use MIS-FS inks with the Piezo
driver
      >(and sometimes with Epson driver/Randall curves) will I also be able
      >to use the same but with the PT midtones inks installed instead of
the
      >MIS-FS midtones?

      I have not directly tried the PT inks, but my impression is that they
may
      have different densities than the original PiezoBW inks. At some point
I
      will probably buy some PT-Selenium cyan and see what it's density is.
If,
      as one test strip I've received suggests, it is denser than the
original
      PiezoBW cyan, I may experiment with diluting it to make it compatible
with
      the FS and original PiezoBW blacks.

      Frankly, I think Cone Editions ought to market a PiezoTone "Museum"
series
      that uses the original PiezoBW black (which I believe is essentially,
if not
      exactly, the same as MIS FS/VM black) and the original densities
(assuming
      the new ones are slightly different -- which is uncertain to me).

      Paul
      http://www.PaulRoark.com


________________
  -----Original Message-----
  From: Martin Wesley [mailto:mwesley250@...]
  Sent: Sunday, September 29, 2002 8:28 PM
  To: DigitalBlackandWhiteThePrint@yahoogroups.com
  Subject: Re: [Digital BW] New EAM


  ----- Original Message -----
  From: "Paul Roark" <paul.roark@...>
  To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
  Sent: Sunday, September 29, 2002 7:54 PM
  Subject: RE: [Digital BW] New EAM


  > Jeff,
  >
  > I read densities on a pile of white paper.  I suspect the differences we
  see
  > in our readings just reflect the inaccuracies of the machines.  As such,
I
  > suspect only relative densities with the same instrument are accurate
  enough
  > to measure the differences we are seeing in the papers.

  Paul,

  This is interesting and may explain some of the differences we have seen
  between your X-Rite Digital Swatchbook and my Spectrocam. The Spectrocam
  came with a ~9x12 black plastic plate and the recommendation to place all
  samples on the plastic with nothing else underneath the sample being read.

  It does make a small difference too. If I place a single sheet on the
plate
  my EAM reads C=0.06, M=0.06, Y=0.00, V=0.06. If I stack sheets up I get
  C=0.05, M=0.04, Y=0.01, V=0.05. In either case this is still
representative
  of the faint blue/blue-cyan tint I usually associate with EAM. The batch I
  have is a couple of months old.

  Martin



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