Path: utzoo!attcan!uunet!know!zaphod.mps.ohio-state.edu!maverick.ksu.ksu.edu!rutgers!gatech!mcnc!rti!dg-rtp!bigben!bigben!philip From: philip@beeblebrox.dle.dg.com (Philip Gladstone) Newsgroups: comp.lang.postscript Subject: Re: Halftoning Algorithm Message-ID: Date: 19 Nov 90 16:56:47 GMT References: <3245@isaak.isa.de> <1990Nov18.225043.680@julius.cs.uiuc.edu> Sender: usenet@dle.dg.com (Net News) Organization: Data General, Development Lab Europe Lines: 16 In-Reply-To: nelson@melodian.cs.uiuc.edu's message of 18 Nov 90 22:50:43 GMT Can someone explain if it would be possible to add (say) Floyd-Steinberg to a Postscript printer to provide greyscale support rather than halftoning via a screen? My experiments in printing greyscale images using F-S look *really* nice although you have to tune various aspects of the algorithm for each particular printer. [It is also really slow as I compute each device pixel on the host and then squirt it down a 9k6 bps line to the printer!] It is unclear if it would go any faster if run on the printer itself (if written in postscript) as it involves quite a lot of manipulation for each pixel. -- Philip Gladstone Development Lab Europe Data General, Cambridge England. +44 223-67600