Path: utzoo!attcan!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sdd.hp.com!uakari.primate.wisc.edu!zaphod.mps.ohio-state.edu!tut.cis.ohio-state.edu!ucbvax!gnh-starport.cts.com!scottg From: scottg@gnh-starport.cts.com (Scott Gentry) Newsgroups: comp.sys.apple2 Subject: Re: APPLEFEST IMPRESSIONS Message-ID: Date: 21 Dec 90 11:53:25 GMT Sender: daemon@ucbvax.BERKELEY.EDU Organization: The Internet Lines: 45 X-Unparsable-Date: Thu Dec 20 90 at 10:03:49 (EST) In a recent post, Michael J. Quinn at the University of Tennessee in Chattanooga, Tennessee said, and I quote, "Just a small note about the Vision Plus Video Digitizer... It's NOT 'real time digitization'. It's 'live'.... In other words, it's ALMOST real time, but not quite. It digitizes (at it's fastest rate) at 15 frames per second. If it were real time, it would digitize at 60 frames/second. There's a considerable performance diference between 15 fps and 60 fps... Unless the new company that took control of the old Vision Plus has increased the digitization rate to 60fps, then it's not real time, although it's incredibally fast as far as Apple II digitizers go (and IBM digitizers too!). " I, too, think the term "real time" is a bit misleading, but to set the record straight, the fastest frame rate _anyone_ can get from an NTSC source is 30 frames per second. The actual frame rate of the Enhanced Vision Plus board is 15 frames per second, which is comparable to the frame rate used in films, so it _can_ be called real time. The practical frame rate of the board varies a little throughout its operation as there is a software interface to consider. I tried to write as little code as was practical for monochrome fullscreen digitizing in Allison without totally smashing the rules and still allowing control over things like contrast, brightness, a pause, an escape, and two ways to save the picture. The frame rate of color digitizing is around 4 frames per second, but the practical frame rate in color, fixed palette (NOT QuickColor - I hate QuickColor) digitizing is around 1 frame per second and this is due to the way I reduce the pixelmaps size so a preview display can be used. If you have Allison and use color, calculated palette preview mode, the rate is around 1 frame every 4-8 seconds depending on number of colors in the raw image and whether or not an accelerator board is present and operating. The board is quite zippy, though. I didn't think too much of it while AST had it marketed because the color software was somewhat less than great. As the lead author of Allison, however, I'm going to refrain from qualitative judgements on the current quality of color images. The proof is in the output. Have a happy holiday season, everyone!:) Scott _______________________________________________________________________________ | Scott Gentry * ALPE AFL Scott * I never said that!| | 2051 Mercator Drive * GEnie W.GENTRY * But you never | | Reston, VA 22091 * UUCP: uunet!ingr!ne1300! * know! | | (703) 264-5652 * brnded!scott * Do You? | |_____________________________________________________________________________|