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- From: mkant+@cs.cmu.edu (Mark Kantrowitz)
- Newsgroups: comp.lang.postscript
- Subject: Re: Postscript Font Scaling & Reduction
- Message-ID: <By3ssn.CBJ.1@cs.cmu.edu>
- Date: 22 Nov 92 06:02:39 GMT
- Article-I.D.: cs.By3ssn.CBJ.1
- References: <1992Nov18.181137.25836@adobe.com> <4007@ecicrl.ocunix.on.ca> <1992Nov19.174800.23493@adobe.com>
- Sender: news@cs.cmu.edu (Usenet News System)
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- Organization: School of Computer Science, Carnegie Mellon
- Lines: 15
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- In article <1992Nov19.174800.23493@adobe.com> delahunt@adobe.com (Jim DeLaHunt) writes:
- >The hints make adjustments based on the number of device pixel spanned by
- >the scaled outline, not based on the point size per se. Hinting will have
- >the same effect on a 10-point font on a 300 dpi device as on a 5-point font
- >on a 600 dpi device.
-
- More precisely, hints make adjustments based on the number of lines to
- the em square. A 12 point font on a 300 dpi device will have
- 12 points x 1 inch / 72 points x 300 dpi = 50 lines
- (Strictly speaking, that 72 should be 72.289, but lets not nitpick.)
-
- Most intelligent scan conversion algorithms do not work well below
- about 24 lines (though I've seen Bitstream's fontware work well on
- Helvetica at 6 lines). That's why most systems that generate screen
- fonts use canned bitmaps below 18 point.
-