Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!seismo!rutgers!cbmvax!daveb From: daveb@cbmvax.cbm.UUCP (Dave Berezowski GUEST) Newsgroups: comp.sys.amiga Subject: Re: Getting fonts printed out right (more answers) Message-ID: <1168@cbmvax.cbmvax.cbm.UUCP> Date: Tue, 23-Dec-86 19:10:22 EST Article-I.D.: cbmvax.1168 Posted: Tue Dec 23 19:10:22 1986 Date-Received: Wed, 24-Dec-86 20:46:13 EST References: <1157@cbmvax.cbmvax.cbm.UUCP> <2384@sdcsvax.UCSD.EDU> Reply-To: daveb@cbmvax.UUCP (Dave Berezowski GUEST) Organization: DMB, Inc. Lines: 26 In article <2384@sdcsvax.UCSD.EDU> hutch@sdcsvax.UUCP (Jim Hutchison) writes: >This raises a question in my mind, which way to you push it? 4x4 is 0-16. >On a screen I have always favored the lighter image (which means making >15 and 16 full white). Here in the subtractive world of CYM (Oh no, no >black!), I presume you lean this way since you can't get real black anyway. >Note: CYM mixed is dark grey, not black. 4 bits is 17 distinct values. > >Not to besmearch your driver, I presume your were just glossing over this >common technical problem with the unexpected perversity of powers of 2. > No besmearchment taken. When I wrote the driver I realized that that there were 17 possible combinations but only 16 choices. It works this way: 0 to 14 selects 0(ie. none) to 14 dots in a 4x4 dither pattern, 15 selects 16 (ie. all dots on) in a 4x4 dither pattern. This choice was made as during the development we discovered that the printed pictures tended to be darker than the screen image. Thus (as you suggested) we went for the lighter side of things. >How is the dot pitch? You use an ordered dither, I presume. This will >result in dotted lines for off-tone text/fonts with narrow charastics. > The dot pitch is up to the individual printer driver. The raw color info is fed to the printer dependent drivers and its up to them to decide what do do with it. Regards, David Berezowski