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- Newsgroups: comp.lang.postscript
- Path: sparky!uunet!charon.amdahl.com!pacbell.com!sgiblab!sdd.hp.com!decwrl!adobe!delahunt
- From: delahunt@adobe.com (Jim DeLaHunt)
- Subject: Re: Postscript Font Scaling & Reduction
- Message-ID: <1992Nov18.181137.25836@adobe.com>
- Sender: usenet@adobe.com (USENET NEWS)
- Organization: Adobe Systems Incorporated
- References: <1992Nov18.045514.4005@oucsace.cs.ohiou.edu>
- Distribution: na
- Date: Wed, 18 Nov 1992 18:11:37 GMT
- Lines: 45
-
- In article <1992Nov18.045514.4005@oucsace.cs.ohiou.edu>
- carlip@oucsace.cs.ohiou.edu (Walter C3arlip) writes:
-
- >... As I understand it, a given style of type will
- >have a different design depending upon the point size it is to be printed
- >at, e.g., Times Roman at 12pt will have lines that are wider and darker
- >relative to the hight of the letter than Times Roman at 20pt.
-
- In the good old days of cold lead type (and maybe hot lead type, I don't know)
- this was true. A 'font' consisted of a certain typeface at a certain size,
- so a different mold or type slug was used for each different size.
- This in turn allowed the design to be varied among sizes in the way you
- describe.
-
- When the industry switched to phototypesetters, this variation was lost.
- The 'font' was then a collection of transparent masks at a single size, and
- optics scaled the mask linearly to the desired size.
-
- PostScript technology preserved this linear scaling. The glyph outline
- is described in bezier curves, and the PostScript interpreter scales the
- outline linearly to the desired size. Therefore, most PostScript typefaces
- have a single design which is used for all sizes.
-
- I say *most*, because Multiple Master font technology returns the
- flexibility type designers had with hot lead. A Multiple Master typeface
- contains two or more 'master designs', and you can create 'font instances'
- which are a mixture of the two master designs. If the designers choose,
- they can make masters with two different 'design sizes'. Adobe's Minion
- Multiple Master typeface contains masters with optical sizes ranging from
- (I think) 6 points to 72 points.
-
- I don't claim to be Adobe's expert on type, but the above is a rough
- explanation, and may show why you got two opposite answers to your question.
-
- To give a practical answer to your practical question, I'd say that
- printing at a larger size with lower resolution and then photo-reducing
- down has always worked pretty well for me. But then, I'm an engineer, not
- a designer.
-
- >_____________________________________________________________________________
- >Walter C3arlip **** carlip@ace.cs.ohiou.edu ****
- >(the "3" is silent)
-
- --Jim DeLaHunt, Developer Support, Adobe Systems Incorporated
- delahunt@mv.us.adobe.com ...!{apple,decwrl}!adobe!delahunt +1-415-962-3790
-