Path: chuka.playstation.co.uk!news From: "Rad" Newsgroups: scee.yaroze.programming.2d_graphics Subject: Re: PAL & NTSC resolutions Date: Sun, 6 Jun 1999 13:31:09 +0100 Organization: PlayStation Net Yaroze (SCEE) Lines: 62 Message-ID: <7jdpn4$49v3@chuka.playstation.co.uk> References: <7hrf3p$4u56@chuka.playstation.co.uk> <7jb4ve$9666@chuka.playstation.co.uk> NNTP-Posting-Host: vil-77.village.gre.ac.uk X-Newsreader: Microsoft Outlook Express 4.72.3110.5 X-MimeOLE: Produced By Microsoft MimeOLE V4.72.3110.3 Alex Herbert wrote in message <7jb4ve$9666@chuka.playstation.co.uk>... > >Rad wrote in message <7hrf3p$4u56@chuka.playstation.co.uk>... >>Can anyone explain the relationships between the screen resolutions and the >>output signal? >> >>For example 320x240 is an NTSC resolution but I use it with PAL and it >still >>works, although I know you get (16?) unused lines at the bottom. >> >>I use 320x240 because it's a 1:1 ratio but having thought about it I'm not >>sure it is with a PAL screen. If not what about 320x256? >> >>Thanks, >> >>Rad. >>rad@cyberdude.com >>http://www.netyaroze-europe.com/~radpsx >> >> > >Hi Rad, > >320x240 has a 1:1 pixel aspect ratio ONLY when displayed in NTSC. The PAL >standard uses more lines than NTSC, so the resulting display ends up >vertically squashed. > >Using 320x256 will allow the display of 16 more lines, but this does NOT >affect the pixel aspect ratio. But, 256 lines still does not fill a PAL >picture, so there are black lines at the top/bottom of the screen. The PS >can be made to display the full 288 lines, but I wouldn't recommend it. >(It's not standard, and it doesn't fit into VRAM very nicely.) > >Theoretically, a horizontal resolution of 384 pixels should give a 1:1 pixel >aspect ratio in PAL. In practice though, it's still not perfect - don't >know why. > >BTW, the pixel aspect ratio only really matters for 2D stuff like sprites. >The 3D functions include aspect ratio correction, so no worries there. > >Hope this helps, > > >Herbs > Wow what can I say, except thanks very much Herbs. ALL my questions answered with EXACTLY what I wanted to know. But what took you so long! ;¬) (just kidding!) Thanks again, mate. Rad. rad@cyberdude.com http://www.netyaroze-europe.com/~radpsx BTW Is it just me or have all the other posts in 2d_graphics disappeared?