[mythtv-users] OT: 1080i question

Gordon Rimac gordon.rimac at gmail.com
Tue Dec 28 13:56:33 UTC 2004

An nvidia card can display any of those resolutions.  Here is a guide
to setting up custom resolutions using a Windows utility called
Powerstrip.  Once you get the image tweaked you can export a Linux
modeline directly from Powerstrip.  You can try other peoples
modelines but my experience has been you need to generate the modeline
yourself using your TV in order to get optimum picture quality.


On Tue, 28 Dec 2004 06:58:22 -0600, Michael J. Lynch <mlynch at gcom.com> wrote:
> If anyone can shed light on this it would be appreciated.  As I understand
> it, resolution for 16:9 with a 1080i monitor is 1920x1080 where 1920 can
> be calculated by:
> 1920 = (1080 / 9) * 16
> Does this hold true for 4:3 also.  E.G.  Is horizontal resolution for 4:3
> aspect ratio with 1080 lines of vertical resolution 1440?
> 1440 = (1080 / 3) * 4
> If both of these are true, is it possible, and is there a video card
> that will
> produce 1920x1080i and/or 1440x1080i?  If so, does anyone have
> modelines for each these?
> Are the h and v sync timing, pulse widths, porches, etc the same for both
> or are they different?
> I have a 16:9 aspect HD monitor and when I watch a 4:3 aspect program
> on a digital channel, I get vertical black bars to the right and left of the
> active video.  E.G.  The picture is centered in the screen.  Does anyone
> know if this is done by adjustment of the porch widths or is it done by
> filling the extra 480 pixels with whatever (black seems to be the choice)?
> --
> Michael J. Lynch
> What if the hokey pokey IS what it's all about -- author unknown
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