Article View: comp.lang.postscript
Article #7899Re: Bitmap decompression in PostScript?
From: Jef Poskanzer
Date: Mon, 30 Jan 1989 08:55
Date: Mon, 30 Jan 1989 08:55
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In the referenced message, wcs@skep2.UUCP (Bill.Stewart) wrote:
>Does anyone have a Postscript program that can be downloaded to a
>Postscript printer to uncompress bitmaps?
The pbmtops filter in recent versions of the PBM package does run-length
encoding. However, for all but the slowest printer links, this is slightly
slower than sending the raw bitmap. The decrease in transmission time
is slightly more than compensated for by the increase in processing time.
Perhaps the decoding routine I wrote is suboptimal; perhaps the slowness
of current PostScript interpreters makes it a hard problem. As far as I
know, everyone who has tried this compression trick has come up with the
same slight increase in time. But if anyone wants to prove me wrong and
send me a faster decoding routine, I'll be glad to use it.
---
Jef
Jef Poskanzer jef@helios.ee.lbl.gov ...well!pokey
There is no substitute for good manners, except, perhaps, fast reflexes.
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!iuvax!rutgers!apple!well!pokey From: pokey@well.UUCP (Jef Poskanzer) Newsgroups: comp.lang.postscript Subject: Re: Bitmap decompression in PostScript? Message-ID: <10529@well.UUCP> Date: 30 Jan 89 08:55:36 GMT References: <432@skep2.ATT.COM> Reply-To: Jef Poskanzer <jef@helios.ee.lbl.gov> Organization: Paratheo-Anametamystikhood Of Eris Esoteric, Ada Lovelace Cabal Lines: 19