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From: johnl@esegue.segue.boston.ma.us (John R. Levine)
Newsgroups: comp.graphics,comp.sys.ibm.pc
Subject: Re: Print a 75 ppi image on a 300 ppi laserprinter
Summary: RTFM, the printer does all the work
Message-ID: <1989Sep30.062340.6859@esegue.segue.boston.ma.us>
Date: 30 Sep 89 06:23:40 GMT
References: <814@dukempd.phy.duke.edu>
Reply-To: johnl@esegue.segue.boston.ma.us (John R. Levine)
Distribution: usa
Organization: Segue Software, Cambridge MA
Lines: 17

In article <814@dukempd.phy.duke.edu> fang@dukempd.phy.duke.edu (Fang Zhong) writes:
>We want to print the [75 dpi] images on a HP series II laserprinter with the
>resolution of 300 pixel per inch.  ...
>	We were told that we needed to buy additional memory expansion module
>for the HP series II laserprinter in order to print 300x300 images.  ...

If you read the manual that came with your printer, you'll find that
Laserjets can print at 300, 150, 100, or 75 DPI.  At coarser
resolutions it uses blocks of 300 dpi dots to represent each logical
dot.  The printer buffers the logical dots, so that at 75 dpi, even
the original Laserjet I could print a full page bit image.  It's no big
deal to program; I wrote a little program to dump 100 dpi screen
images in an afternoon.
-- 
John R. Levine, Segue Software, POB 349, Cambridge MA 02238, +1 617 492 3869
johnl@esegue.segue.boston.ma.us, {ima|lotus}!esegue!johnl, Levine@YALE.edu
Massachusetts has 64 licensed drivers who are over 100 years old.  -The Globe