Path: utzoo!attcan!uunet!convex!killer!ames!nrl-cmf!cmcl2!rocky8!cucard!ccnysci!alexis
From: alexis@ccnysci.UUCP (Alexis Rosen)
Newsgroups: comp.sys.mac
Subject: Re: Laser printer summary- some corrections.
Message-ID: <1008@ccnysci.UUCP>
Date: 18 Nov 88 12:19:25 GMT
References: <995@ccnysci.UUCP> <7926@megaron.arizona.edu>
Reply-To: alexis@ccnysci.UUCP (Alexis Rosen)
Lines: 38

In article <7926@megaron.arizona.edu> jms@mis.arizona.edu (Joel Snyder) writes:
>Alexis Rosen writes about write-white vs. write-black engines.
>[...] I can say that either of the Apple LaserWriters produce better
>output than the Toshiba 26 ppm write-white engine, when it comes
>to big black areas.  The LaserWriters tend to be much darker,
>but spotty.  The spottiness goes away when you shake the toner
>cartridge (at least at our site it does).  The Toshiba is not nearly
>as dark, but is always even all the way through, barring scratches
>or other miscellaneous debris on the drum.  So, my point is
>that it is NOT true that write-white engines are better or worse
>than write-black engines, but it IS true that some engines are
>better than other engines, particularly in printing large black
>areas. 

Well... Your Toshiba may be running out of toner :-)

Seriously, I didn't say that one was better than the other. Of course all
engines are created UNequal, and it is possible (even easy) to build an
engine of one type that is in all respects worse than some engine of the
other type. But there are two rules of thumb that are _usualy_ applicable:

1) Since write-black engines are effectively painting black onto a white
   background, they will be more likely to exhibit streaking over large
   areas of black.

2) Since write-white engines paint white onto a black background, they are
   more prone to leaving the insides of very small closed outlines (like the
   closed loop at the bottom of a six-point letter 'a') filled in.

Don't post about how _your_ printer isn't like that... These are only
generalities... Also, be aware that the state of your toner cartridge can
have overwhelming effect on the quality of your output.

----
Alexis Rosen                       alexis@dasys1.UUCP  or  alexis@ccnysci.UUCP
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