On Sun, 16 Jan 2005, Brad Templeton wrote:
On Sun, Jan 16, 2005 at 07:11:42PM -0500, [EMAIL PROTECTED] wrote:As usual, "it depends." The TVOUT of many video cards blows chunks. In order to make the frequencies compatible, a temporal rescaling (read: scanline conversion) must be done. If you don't run with 480 vertical resolution, another scaling is done. From what I understand talking with an nvidia guy, the later nvidia cards/drivers have a "non-scaled" option that quietly kicks in if you request a standard supported resolution (e.g. 720x480). With that, there may not be much advantage. If you're running a tv-weird (e.g. 800x600 or 1024x768) resolution, there's one more layer of scaling that doesn't need to be done.I would love to achieve the same with my SDTV that has component inputs, my questions are:
1) Can this VGA -> Component conversion be done for SDTVs (Not HDTV) and if so is it worth it , in that will there be a significant increase in image quality ?
The jump won't be that big. It may not be much at all if you still are driving it with interlaced signals.
Since you mentioned over/underscanning it sounds like you may not be getting a 1:1 from the card. My experience with "direct" VGA->TV conversion (NOT scanline conversion... just NTSC modulation) has been a *significant* increase in quality. The pseudo-disadvantage is you need to program your modeline exactly. You can still do over/underscanning, but you'll need to compute what to do manually from tweaking the modeline. My TV doesn't even do 480p on the component in so I haven't tried that hard. If it did, I'd be using it.... progressive and full colors are *much* better than S-vid (e.g. xterm text is very readable and useable).
-Cory
************************************************************************* * Cory Papenfuss * * Electrical Engineering candidate Ph.D. graduate student * * Virginia Polytechnic Institute and State University * *************************************************************************
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