[comp.fonts] Write white vs. write black laser printers

josephs@ttidca.TTI.COM (Bill Josephs) (06/15/88)

It seems to me that there is a difference between characters printed
on a "write white" laser printer vs. those printerd on a "write black"
unit.  When I print on my Okidata (write white, I think), characters
appear less bold and often have some strange "jiggles" (the arms of a
capital M in garamond, for instance, are wavy).  On a LaserJet II
(write black), this doesn't seem to happen (and I've never read any
comment to indicate that other prople are suffering "wavy arms").  Has
anyone investigated this further (all Ricoh engines are write white, I
believe) and are their versions of the same font for the different
laser engines?


Bill Josephs
Citicorp/TTI
3100 Ocean Park Blvd.
Santa Monica, Ca. 90405

guido@cwi.nl (Guido van Rossum) (06/21/88)

The industry is certainly aware of this problem (my brother is getting a
summer job patching up fonts for a company producing white-writing laser
printers), but I believe there are quite a few LW clones on the market
which, for obvious reasons, don't address the problem.
Perhaps Adobe's PostScript font-producing algorithms are tuned for
black-writing, which may be one of the reasons output from black-writing
LW's looks better.
--
Guido van Rossum, Centre for Mathematics and Computer Science (CWI), Amsterdam
guido@piring.cwi.nl or mcvax!piring!guido or guido%piring.cwi.nl@uunet.uu.net

bts@sas.UUCP (Brian T. Schellenberger) (06/26/88)

Not only PostScript output looks better in write-black.  The TeX METAFONT
fonts tend to, as well.  Even fonts that are built-in look much better on
out write-black LaserJets and LaserWriters than our write-white Imagen.

I personally suspect that this may be because writing was developed on
write-black systems.  Pen and ink is write-black; so is traditional
printing and the Linotype process.  Is offset printing more analogous to
write-white or write-black?
-- 
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