Path: utzoo!utgpu!news-server.csri.toronto.edu!bonnie.concordia.ca!uunet!ogicse!qiclab!techbook!waynekn From: waynekn@techbook.com (Wayne Knapp) Newsgroups: comp.sys.amiga.advocacy Subject: Re: AMIGA Message-ID: <1991May13.001943.23307@techbook.com> Date: 13 May 91 00:19:43 GMT References: <1991May6.115535.8982@sugar.hackercorp.com> <1991May6.164821.8807@cunixf.cc.columbia.edu> <937@cns.SanDiego.NCR.COM> <1991May8.062658.14796@cunixf.cc.columbia.edu> Organization: TECHbooks of Beaverton Oregon - Public Access Unix Lines: 32 mykes@amiga0.SF-Bay.ORG (Mike Schwartz) writes: >ANIM format is quite good because of XOR compression from frame to frame. >ANIM format is NOT good if you are using digitized HAM images (due to noise >created during the digitizing process). In fact, HAM images, which require >48K for low res and 96K for 320x400 (recommended) don't compress well at all >using standard techniques (LZH et al). The most impressive animations I have >seen running from hard disk aren't full screen in size (but still are very >impressive none the less). Actually, while XOR is supported in the Anim format, almost no one uses it. Almost all the full screen ANIMs are a straight replace the changes mode. This is know as the commom OP5 format. Anim brushes do sometimes use the XOR format, ala DPIII. Anyway, I know about that because I modified the ANIM code to work with DPIII ANIM brushes for the Commodore Point Sale demo. (The one that is AmigaVision based and works with a laser disk.) As far as HAM goes, the rule of thumb is that HAM sucks for animation. The ramping though bogus colors to get to the right colors generates noise no matter how the frames were produced. Now this isn't 100% true, because if you are clever, and use only red, blue, green shades and only 13 other colors, HAM can look great. But it is very hard to produce an animation in HAM without some HAM noise. Wayne Knapp Consultanting Associate Hash Enterprises -- waynekn@techbook.COM ...!{tektronix!nosun,uunet}techbook!waynekn Public Access UNIX at (503) 644-8135 (1200/2400) Voice: +1 503 646-8257 Public Access User --- Not affiliated with TECHbooks