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- From: Ladd.Morse@p804.f70.n109.z1.fidonet.org (Ladd Morse)
- Sender: Uucp@blkcat.UUCP
- Path: sparky!uunet!blkcat!Uucp
- Newsgroups: comp.sys.mac.hardware
- Subject: Offset from laser output
- Message-ID: <713991656.F00002@blkcat.UUCP>
- Date: Sun, 16 Aug 1992 10:37:55 -0500
- Lines: 53
-
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- GM> 1. Is my above assumption correct?
-
- Yes. Printing any scanned photo automatically generates a half-tone. Depending
- on the software package you print from, it will either use the printer's default
- screen value or create a screen value of your choosing via some type of user
- selectable specification.
-
-
- GM> 2. What is the effect of using the
- GM> "Photograde" output of a IIf or IIg? Or outputting to a Lino? I
- GM> assume the output process in all cases is such that the output needs
- GM> no further processing.
-
- Using the photograde output will allow you to create a line screen of higher
- frequency. Ex: "regular" laserwriters quality maxes out at about 53 lines per
- inch screen. Photograde capable printers max out at, I'm guessing here, about
- 90 lines per inch screen.
-
- Lino output varies by the model of imagesetter used and will create a superior
- image - even if you output at a lower line screen frequency matching the highest
- that photograde can do.
-
- GM> 3. Assuming this is true, then at what
- GM> resolution would an offset press no longer be able to reproduce a
- GM> dithered gray? (i.e. how fine is too fine?)
-
- This question should be directed to the business that will be doing you
- printing. The preferred line screen you should use depends on what type of
- printer they have and their skill.
-
- As a general guideline, a 90 line screen will give you acceptable results and
- any printer worth his ink should be able to print it. A 120 or 150 line screen
- will give superior results, but will be more expensive to print and may not be
- necessary in your case.
-
- You have done your homework well by asking general questions on the net.
- I cannot state strongly enough that if you are working on a project that you are
- actually interested in and are spending your (or especially someone else's)
- money on, you need to talk to the printer you believe will be doing the job and
- find out what their requirements are.
-
- If you have not selected a printer, then start talking to a few and find out who
- knows the most about the type of computer and software you're using. Keep
- looking until you find someone who goes "sure, I believe I understand what
- you're trying to do - do this, this, this and this, and you'll end up with this.
- Let me show you an example". You will save hours, maybe days of time.
-
- Ladd
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