Re: Aspect Ratios on video discs etc

From: Freya (email suppressed)
Date: Sun Sep 03 2006 - 02:52:15 PDT

--- Ken Bawcom <email suppressed> wrote:

> Okay, I see what you mean now, using every pixel in
> an anamorphic DVD
> to carry picture content, regardless of aspect
> ratio. Yes, I suppose it
> would be easy enough for a DVD to carry a flag
> noting the size of the
> unsqueeze. The question in my mind, that I don't

Probably just a byte with a number in it. It wouldn't
even need to know anything about the aspect ratio,
just how much unsqueeze to perform.

> have the technical
> knowledge to answer, is, would a digital display
> device designed to
> display things at the 16x9 aspect ratio, as they all
> are, be able to
> handle an unsqueeze that includes no information on
> what to display
> above and below the unsqueezed frame? For a 2.35:1
> 'scope film, that
> would be a lot of space. If that is not a problem
> for displays, yes,

Well, my 4:3 composite monitors have no problem
displaying anamorphic 16:9 content as a letterboxed
16:9 image, so I'm sure that a 16:9 screen could be
given data to output a letterboxed 2.25:1 image.

> certainly they should do it, at least for the most
> common aspect
> ratios, like 1.85:1, and 2.35:1. Perhaps that will
> come, down the road.

I don't see why it shouldn't be for all aspect ratios
(within a certain range). It seems to me it would
actually be harder to implement for specific aspect
ratios than to just make it generic.

> It should be easy to make players that would output
> those other
> unsqueezes to displays unequipped to handle them in
> a form they can
> use. Blu-ray and HD-DVD are in their infancy. Maybe
> later!

It sounds like these formats will handle less aspect
ratios than DVD. So we will have to wait for yet
another format in the future. :(



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