From: Kees Brandenburg (info@co-web.org)
Date: 11/09/01-07:17:05 AM Z
Did you see a relation between the resolution of the original file
and the amount of posterisation? The cone piezoBW plugin interpolates
the file to achive a higher printed resolution. I have the
impression, but did not do any testing yet, that posterisation may be
higher with prints from lowres scans (200-360 ppi) and less with high
res scans (720 ppi and above). I saw posterisation in mid and high
tones in (positive) piezo prints on paper from ~ 200ppi files.
Did you use non-kryloned prints too? Were they still sticky as is
often seen with transparency media?
thanks,
kees
>Joe Smieglitz (on this list) had sent me some sample density step
>digital negatives he made using Pictorico OHP film, an Epson
>1160, and Cone Quad ink products which was subsequently coated with a
>layer of Krylon acrylic.
>
>I made Pt/Pd prints using these negatives and concluded that more effort
>would be needed. Some of my observations follow:
>
>Texture from the Krylon did not seem to be easily detected in the
>print. However, there was some distinct banding, likely from the inkjet
>printer. This banding could be seen in the negative and showed in the
>print.
>
>There also seems to be posterization in what should be the "continuous"
>band. Posterization was not noticed in the darker values, and is very
>noticeable in the mid through upper values of the print without
>magnification.
>
>The densest ink (100%) seems to be able to produce a paper white (in the
>print) when given an exposure to produce maximum black with the blank
>substrate.
>
>My conclusion at this point is that the posterization issue has yet to
>be resolved to make a Pt/Pd print comparable with that from a film
>negative. This does not mean that it can not be accomplished, but these
>equipment and materials have not demonstrated a capability to do so.
>
>--
>Jeffrey D. Mathias
>http://home.att.net/~jeffrey.d.mathias/
--
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