Re: [Dvdauthor-users] Widescreen question

[Scott T. S. <sc...@ge...>]

On Tue, 2004-02-24 at 09:02, Steven M. Schultz wrote:
> On Mon, 23 Feb 2004, Scott T. Smith wrote:
> 
> > you need to tell your picture editting software the correct dpi.
> > 
> > for 4:3:
> > NTSC, create a 720x480 image with 81x72dpi
> > PAL, create a 720x576 image with 75x80dpi
> > 
> > for 16:9:
> > NTSC, create a 720x480 image with 81x96dpi
> > PAL, create a 720x576 image with 45x64dpi
> 
> 	That's one way to do it.  
> 
> 	The other method which I've been using is to create the graphics
> 	files at  (some manuals/books talk about creating images at 720x534
> 	instead of 720x540 - something about D1 NTSC vs DV NTSC - sigh):
> 
> 	NTSC     Size
> 	----     ----
> 	4:3      720x540
> 	16:9     854x480
> 
> 	PAL      Size
> 	---	 ----
> 	4:3	 768x576
> 	16:9	1024x576
> 
> 	and then resize to 720x480 (NTSC) or 720x576 (PAL) after DESELECTING
> 	the 'constrain aspect ratio' checkbox (or unlocking the aspect tracking
> 	feature).
> 
> 	For 4/3 NTSC if you're using graphics with thin lines it is better to
> 	create the image at 640x480 and resize to 720x480.   Why?   Because
> 	that way the image is only changed horizontally and not downscaled
> 	vertically (540 -> 480) which makes thin lines even thinner and could
> 	run into flicker to do interlacing.

that's exactly why I use the dpi option on The Gimp.  That way I have
full control over what each pixel looks like, and it is truly WYSIWYG.

	Scott