Re: Levels & Curves

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I think I am going to disagree with you, assuming we are speaking in the
same terms.  What I mean by non-linear, is not that you cannot create
linearity of shading with the right ink and paper mixes, but that to do
so, you cannot use a linear relationship of ink quantities.

The main difference between the response of silver halide printing
technology and inkjet is that the photo print papers have the colors
built in, and the d-max the papers can create is predetermined, no
matter what you do chemically or in exposure.  The inkjet print realm
has two distinct elements which are independent, those being inks and
papers.  The paper and inks do not have the same curves as
exposure/chemistry/photo print paper.  Due to the nature of liquid dyes
or even pigments, as in offset printing, black levels must be thinned as
one approaches darker colors/shadows, or they will block up.  In other
words, the darker end steps are much more sensitive to ink quantities or
saturation levels, requiring cutting back on all ink levels as black is
approached.  Admittedly, the use of well designed inkjet papers can
improve shadow response considerably.

If your posting is speaking about creating linear steps, then I agree
with the correct materials inkjet process can accomplish this (again
with the correct ink curves).

Art


Dave King wrote:

  > From: Arthur Entlich <artistic@ampsc.com>
  >
  >>I think we have hit upon something here.  Inkjet prints cannot be
  >>printed with a linear function of the inks,
  >>
  >
  > Of course they can, but not easily, and not without instrumented
  > measurements of specific conditions, and certain papers and inks etc.
  >
  > -
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