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In Reply to: Re: Svideo Resolution? posted by GPB on January 18, 2001 at 03:30:52:
I have my computer putting out an 800x600 signal to my hdtv (which in theory support up to 1080 vertical resolution) over an svideo cable. I'm figuring that because it looks crisp on my monitor, and I know my tv can deal with an 800x600 resolution, that the reason my picture (text especially) looks crappy on the Tv screen must lie in the method of connecting the two (i.e. the svideo cable). I may be missing something huge here though...I'm a software engineer, and this seems to me a hardware issue =).what do you think?
ryan
Follow Ups:
On HDTV's, there is no support for a high definition signal over an S-Video cable. Keep in mind, a high def signal is not a computer signal UNLESS your graphics card is capable of providing such a signal; your card is surely outputing a standard NTSC which has at the most, about 525 lines of resolution, interlaced.The vertical resolution of your set is probably greater than 1080 (depending on its size), but the HD input for all HD sets is 1080 interlaced (or 720P)...and can normally be fed via component (or RGB) inputs (not S-video or composite). This is all irrelevant to what you are doing however, but thought I'd mention it anyway.
What's happening is the video card is converting a computer signal of 800 x 600 to NTSC interlaced which inherently lowers resolution - combine that with looking at the image on a presumably much larger display and you have an inferior picture. The quality of your internal line doubler in the HD set may also be a bit of an issue. Bottom line - it's probably as good as it can get.
-- Greg
Well resolution in monitors is somewhat different than in TV sets. Here is where confusion becomes.
Your TV present resolution can be at any point higher or lower than comp picture you are about to transfer. If resolution does not match you will get worse picture no matter how does not match, as higher or lower.When your comp change resolution from 800x600 to 1024x768 it is not just resolution of the picture that is sent to monitor, but also monitor adjusts it's resolution to this same numbers. And so what, you may ask??? OK.
Your TV has fixed resolution, and your video card (or other external converter) probably assumes you have 625(PAL) or 525(NTSC) TV. And here is the mismatch. When your card try to adjust resolution to TV's resolution, cause TV can not adjust itself, the picture loses some of the lines and some of the lines are filled with same line to match the same resolution. This degrades picture big time. Second is a TV tube. Even if you have HDTV it is not even close to the quality of monitor tube. This will also add big problems to small caracters.
You should check to what format your card converts the signal, and try to get converter or card that is capable of HDTV hook up. Not just the hook up but resolution 1080 support as well. This will give you much better picture.
If your card/converter supports only NTSC or PAL, an HDTV will not give you anything better.
As a result of all this conversions, a picture 800x600 will apear on TV similar to 500x400 on NTSC. This is hardly enough to read from the screen.
n/p
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