Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!usc!wuarchive!decwrl!fernwood!oracle!news From: pnakada@oracle.com (Paul Nakada) Newsgroups: comp.sys.apple2 Subject: Re: Monitor Moire Patterns (was Re: SCSI cards) Message-ID: Date: 15 Oct 90 05:46:32 GMT References: <9010142019.AA20262@apple.com> <1990Oct15.004324.20441@nntp-server.caltech.edu> <1990Oct15.020907.17900@ux1.cso.uiuc.edu> Sender: news@oracle.com Organization: Oracle Corporation, Belmont, CA Lines: 38 In article <1990Oct15.020907.17900@ux1.cso.uiuc.edu> jb10320@uxa.cso.uiuc.edu (Desdinova) writes: In article <1990Oct15.004324.20441@nntp-server.caltech.edu> toddpw@tybalt.caltech.edu (Todd P. Whitesel) writes: >> >>I am pretty convinced that the problem has to do with the fine resolution of >>640 mode and the dithered color 'beating' (in the same sense as an amplitude >>modulated sine wave beats) with the dot pitch on the color monitor. Monitors >>with a better dot pitch should reduce this phenomenon. >> >>My solution is to use a desktop picture and don't bother with the pattern >>at all. > Eek. Hardly a solution. The thing that bugs me about this is that with >identical monitors hooked up to two identical GSs, one exhibits this behavior >and one doesn't. >Besides, I like my desktop a dithered purple. :-) If it makes you feel any better, I've got a ~$2000 16 inch sony monitor and it exhibits the same behavior.. My feeling is that even the slightest variance in dot pitch across a scan line will cause the "moire" behavior... a few suggestions... a) use a desktop picture b) use a much coarser pattern (don't know if this will help) c) use a solid color... the reason that the desktop is usually a pattern is that the original Mac had no grey scale, so it used a pattern to dither a grey... With a color monitor I think you should probably use a solid color instead.. -Paul Nakada -- Paul Nakada | Oracle Corporation | pnakada@oracle.com