Path: utzoo!utgpu!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!mailrus!cornell!rochester!rocksanne!rainero
From: rainero@rocksanne.UUCP (Emil Rainero)
Newsgroups: comp.lang.postscript
Subject: Re: what about color laser printers?
Keywords: LaserWriter, PostScript
Message-ID: <627@rocksanne.UUCP>
Date: 19 Dec 88 14:36:09 GMT
References: <1667@valhalla.ee.rochester.edu> <113@adobe.COM>
Reply-To: rainero@rocksanne.UUCP (Emil Rainero)
Organization: Xerox Corp., Webster, NY
Lines: 31

In article <113@adobe.COM> jackson@adobe.UUCP (Curtis Jackson) writes:

>Just a bit of picky education:  There is no such thing as "Color Postscript".
>The Postscript [tm] Language from Adobe has always had full color support
>from Day 1.

THIS IS NOT TRUE. Synthetic graphics (yes fonts too) could use setrgbcolor and
sethsvcolor operators, but there was no way to send color images (jee, maybe 
this is why the new operator is called 'colorimage') to 1.0 PostScript printers.


The extensions for color also include a CMYK color model, color screens,
color transfer functions, and support undercolor removal and black generation.
My main reason for posting this message is to make clear that while it is true 
that color was supported from PostScript's inception, additions were necessary
to claim functional color support. These extensions, as well as other problems
that Apple has introduced, is why we are now seeing device specific PostScript 
masters being generated from Macintosh emitters.


(Emil's Psychic Forecast for 1989)
It is interesting to note that even with 24 or 32 bit color images, there is
no built-in support for compression. (please, no flames about writing it in
PostScript). With the proliferation of compression/decompression chips,
I would expect to see further extensions from Adobe.


-- 
Emil Rainero -- Xerox Webster Research Center
UUCP:           {seismo,allegra,decvax,cmcl2,topaz}!rochester!rocksanne!rainero
Arpa Internet:   Rainero.wbst@xerox.arpa