On 5/11/03 5:22 AM, "Gerald Lange" <bieler@...
> used "high-resolution stochiastic screens from polymer plates" to
> print some collages (letterpress) for his book _Silo_.
> Hopefully, Harold will chime in here,
Sorry that I was out of town and unable to respond. I was experimenting two
years ago with stochiastics and had mixed results. I used Jim's method of
creating a diffusion dither after adjusting images' curves while in the
grayscale color mode. Please keep in mind I was not attempting color
work--only black ink. I was trying to make the dot disappear and make the
image seem continuous. I'm late to this thread--has anyone has mentioned the
book that got me started?
It deals with alt photo and not letterpress.
Back to the Silo book...by "high-res" I mean that I used grayscale images of
1200dpi dithered to bitmaps of 1200dpi. This naturally caused severe hot
spots and ink gain, and I made many tests of different curves before
This looks wacky on screen but printed close to target in several instances.
I imagine that different papers and inks would require different curves. If
I had more time to test each image I might have been more successful. The
biggest problem was keeping a broad tonal range in each image--avoiding hot
spots on the one hand and dark, murky images on the other. I would never try
this in color--one channel was difficult enough. Be sure to test a small
Wish I had more time to experiment with this nowadays...
Hope this helps...???
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