Path: utzoo!utgpu!news-server.csri.toronto.edu!bonnie.concordia.ca!uunet!elroy.jpl.nasa.gov!ncar!gatech!taco!hobbes.catt.ncsu.edu!kdarling From: kdarling@hobbes.catt.ncsu.edu (Kevin Darling) Newsgroups: comp.sys.amiga.advocacy Subject: Re: CDTV News Message-ID: <1991Jun15.064022.27467@ncsu.edu> Date: 15 Jun 91 06:40:22 GMT References: <1991Jun12.205030.4401@news.iastate.edu> <1991Jun14.181002.28902@news.iastate.edu> <1991Jun15.003044.7479@mintaka.lcs.mit.edu> Sender: news@ncsu.edu (USENET News System) Organization: North Carolina State University Lines: 37 rjc@wookumz.gnu.ai.mit.edu (Ray Cromwell) writes: > > Marc, CD-I is not 24-bit color, nor 24-bit palette, nor 15 bit. WRONG. No it doesn't have 24-bit color (altho DYUV is pseudo-24-bit, just as HAM is pseudo-12-bit). But CD-I does have a 24-bit palette for its CLUT modes, and it also has a 15-bit/pixel RGB direct mode. >CD-I is DYUV encoded just like DCTV. This means it is limited to >composite (same limitations the Toaster has). WRONG. The output is always RGB, which is then converted to composite. However, I never mentioned this before. But thanks for asking first :-). And DYUV is just one the video modes. I've told you THAT many times. >It also means CD-I will be interlaced on normal-tv's unless it doesn't >have >200 lines. HUH? Of course it has interlaced modes! What do you think a consumer interactive-TV unit would output, anyway? VGA frequencies? >BTW, DYUV encoding has some of the same draw backs that HAM has. >You can't change colors quick enough (I think you can change >intensity every pixel, but color can only be changed every few pixels) Not quite. Color DATA can only change every two pixels; luminance every pixel. But those two adjacent pixel colors are _also_ interpolated via hardware. In addition, the DYUV range of 16 million colors, and the better luminance control, beats the pants off the far more limited 4096 color HAM mode. You're correct that except for prerecorded animations, neither DYUV nor HAM are great for realtime anim calculations. But that's obvious. [ An incredible 20 lines' worth of signatures deleted] Please don't even bother responding, Ray. It's very apparent that you've not been paying attention all these months. I'll be posting some articles later on, which you should obviously read. - kev