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- Newsgroups: comp.sys.mac.hardware
- Path: sparky!uunet!cs.utexas.edu!usc!rpi!news.columbia.edu!cunixa.cc.columbia.edu!gmw1
- From: gmw1@cunixa.cc.columbia.edu (Gabe M Wiener)
- Subject: Offset from laser output
- Message-ID: <1992Aug16.003852.9329@news.columbia.edu>
- Sender: usenet@news.columbia.edu (The Network News)
- Nntp-Posting-Host: cunixa.cc.columbia.edu
- Organization: Columbia University
- Date: Sun, 16 Aug 1992 00:38:52 GMT
- Lines: 30
-
- Never having gone from laser to offset before, I'm curious as to the way
- photographs are handled.
-
- Generally, if one were to take a regular b&w photograph and insert it into
- a paste-up for offset, it would need to be halftoned first.
-
- My assumption is that if you were to scan an image on the mac and insert
- it into your favorite DTP package and then output it to a LaserWriter, the
- very process of printing gray on the LW, even if you scanned the image in
- grayscale, would essentially do the same as halftoning, since the LW cannot
- print true gray to begin with.
-
- Several questions:
-
- 1. Is my above assumption correct?
- 2. What is the effect of using the "Photograde" output of a IIf or IIg?
- Or outputting to a Lino? I assume the output process in all cases is
- such that the output needs no further processing.
- 3. Assuming this is true, then at what resolution would an offset press
- no longer be able to reproduce a dithered gray? (i.e. how fine is
- too fine?)
-
- Thanks.
-
-
- --
- Gabe Wiener - Columbia Univ. "This 'telephone' has too many shortcomings
- gmw1@cunixa.cc.columbia.edu to be seriously considered as a means of
- N2GPZ in ham radio circles communication. The device is inherently of
- 72355,1226 on CI$ no value to us." -Western Union memo, 1877
-