Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!seismo!cmcl2!yale!husc6!mit-eddie!genrad!decvax!ucbvax!sdcsvax!hutch From: hutch@sdcsvax.UCSD.EDU (Jim Hutchison) Newsgroups: comp.sys.amiga Subject: Re: Getting fonts printed out right Message-ID: <2384@sdcsvax.UCSD.EDU> Date: Tue, 23-Dec-86 07:26:29 EST Article-I.D.: sdcsvax.2384 Posted: Tue Dec 23 07:26:29 1986 Date-Received: Tue, 23-Dec-86 21:44:25 EST References: <1157@cbmvax.cbmvax.cbm.UUCP> Reply-To: hutch@sdcsvax.UUCP (Jim Hutchison) Organization: UCSD EMU Project (Educational Microcomputer Unix) Lines: 28 In article <1157@cbmvax.cbm.UUCP> daveb@cbmvax.UUCP (Dave Berezowski) writes: > The dithering works on a 4x4 dither matrix which produces 16 >possible shades per base color (yellow, magenta, cyan, and black (maybe)). > (Your printer doesn't have black, so black isn't used). > These base colors are then mixed to produce 16 possible shades of > red (y+m), green(y+c), blue(m+c). Since the Amiga's colors have > 16 intensity levels (0-15), the translation works very smothly. 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. 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. Have you considered applying a clamping algorythm to your dither for cases where people refuse to loose the fine detail, and would rather loose some of the color replication? It's just a thought. -- Jim Hutchison UUCP: {dcdwest,ucbvax}!sdcsvax!hutch ARPA: Hutch@sdcsvax.ucsd.edu "The more you drive, the less intelligent you are." - "Repo Man"