Xref: utzoo comp.sys.mac.hardware:7221 comp.sys.mac.misc:6651 Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!zaphod.mps.ohio-state.edu!sol.ctr.columbia.edu!lll-winken!cert!netnews.upenn.edu!eniac.seas.upenn.edu!jeffe From: jeffe@eniac.seas.upenn.edu (George Jefferson ) Newsgroups: comp.sys.mac.hardware,comp.sys.mac.misc Subject: Re: grayscale on a DeskWriter? Message-ID: <34593@netnews.upenn.edu> Date: 11 Dec 90 23:46:49 GMT References: <1990Dec11.013424.4070@rodan.acs.syr.edu> Sender: news@netnews.upenn.edu Reply-To: jeffe@eniac.seas.upenn.edu (George Jefferson ) Organization: University of Pennsylvania Lines: 35 >If you still aren't convinced that the DeskWriter will do greyscaling (at least >of a sort compared to Postscript), try printing the standard grey patterns from >MacDraw (or even FreeHand, I believe). The deskwriter driver has a 'pallete' of about a dozen standard fill patterns for which it substitutes a fill pattern which gets printed at 300dpi. These substitute fill patterns are designed to approximate the level of grey 'intended' by the standard fill pattern. It turns out they are _not_ the same 1-bit pixel pattern simply scaled by 25% both sets of patterns can be easily modified with res-edit, although I was unable to improve on the defaults (no suprise) the interesting implication is that if you request a 'standard' 50% grey checkerboard pattern you get a very grey looking high resolution fill, but if your fill pattern is 'almost' a checkerboard - say one pixel out of place, you get a faithful 72 (or 75 ?) dpi fill. This also means that you cant create a 72dpi checkerboard even if you want one. (without res-edit or other tricks) All of this only apply's if you are prining a filled region, or shaded line. If you send a bit map I don't beleive any 'modification' takes place. -- -george @sol1.lrsm.upenn.edu