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From: mark@lakesys.UUCP (Mark Storin)
Newsgroups: comp.lang.postscript,comp.text.desktop
Subject: Re: Publishing laserset material (and printer "resolution")
Message-ID: <315@lakesys.UUCP>
Date: 24 Jan 89 14:46:05 GMT
References: <10322@gryphon.COM> <88@sopwith.UUCP> <10844@gryphon.COM> <13747@ico.ISC.COM> <2535@daisy.UUCP>
Reply-To: mark@lakesys.UUCP (Mark Storin)
Distribution: na
Organization: Lake Systems - Milwaukee, Wisconsin
Lines: 33

In article <2535@daisy.UUCP> cplai@daisy.UUCP (Chung-Pang Lai) writes:
>In article <10844@gryphon.COM>, richard@gryphon.COM (Richard Sexton)
>replied to a comment about using the printer's full resolution:
>
>> Huh ?  300 dpi is 300 dpi.
>
	I missed the original posting so don't know if this is relevant,
but... It is sometimes possible to increase the apparent resolution of a
laser printer, beyond 300dpi, using a technique called half-bitting or
dentation.  From "Digital Typography" by Richard Rubinstein;

	"Because of the way in which toner goes onto paper, usually an
	isolated pixel will not produce a spot on the paper. That location
	will take on the color of the pixels that surround it.  By
	intentionally creating certain kinds of ragged edges and including
	voids in letterforms, the toner can be coerced into occupying
	positions intermediate to the resolution increments. ... Thus a 300
	dpi printer may produce letterforms with greater positioning accuracy
	than 1/300-inch.  The size of the effect depends on the
	characteristics of the particular printer.  The result for a
	particular printer could be the equivalent of 1/450-inch feature
	dimensions for the affected parts of the letterforms."



-- 
Mark A. Storin
Lake Systems, Milw., WI
mark@lakesys.lakesys.COM
-- 
Mark A. Storin
Lake Systems, Milw., WI
mark@lakesys.lakesys.COM