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From: mar@athena.mit.edu (Mark A. Rosenstein)
Newsgroups: comp.fonts,comp.lang.postscript
Subject: Re: METAFONT & PostScript
Summary: postscript can tweek pixels
Message-ID: <7773@bloom-beacon.MIT.EDU>
Date: 1 Nov 88 18:53:15 GMT
References: <902@cps3xx.UUCP> <10417@s.ms.uky.edu> <422@trigraph.UUCP> <3455@pt.cs.cmu.edu>
Sender: daemon@bloom-beacon.MIT.EDU
Reply-To: mar@athena.mit.edu (Mark A. Rosenstein)
Organization: Massachusetts Institute of Technology
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In article <3455@pt.cs.cmu.edu> tgl@zog.cs.cmu.edu (Tom Lane) writes:
>					  In any case, a PostScript font
>designer has no means of specifying resolution-dependent --- as opposed to
>size-dependent --- adjustment of character outlines.  (Correct?  I thought
>that PostScript carefully hides the printer resolution...)

No, it is possible to adjust a postscript path based on the actual
device pixels.  The code fragment
	transform round exch round exch itransform
will take a x,y coordinate in user space and move it to the nearest
pixel in device space.  One could use this to make sure that critical
points in a character outline line up in a reasonable manner on
pixels.
					-Mark