RE: 3D SPEX (and LCS in general)

[P3D John W Roberts <roberts@xxxxxxxxxxxxxxxxx>]

>Date: Thu, 28 Aug 1997 21:05:38 -0500
>From: P3D Andrew Woods <andrew@xxxxxxxxxxxxxxxxxxxxx>
>Subject: RE: 3D SPEX (and LCS in general)

>John Urbanic <URBANIC@xxxxxxxxxxxxxx> wrote:
>>...DON'T USE LOSSY COMPRESSION FOR 3D.

>I can't help but notice some double standards cropping up here.
>First you say that it's OK to use 3D at half the vertical res. of 2D
>images but then you say that you need higher quality images in 3D than
>in 2D...

That was comparing something which (allegedly) doesn't affect *horizontal*
resolution with something which (allegedly) *does* affect horizontal
resolution. The claim (which sounds plausible) is that horizontal
resolution is more important than vertical resolution for depth
perception.

>The advantage with JPEG compession is that the user can dial up the
>amount of compression they need for a particular application.
>If you can afford the disadvantages of large file size (long download,
>more space on you hard drive) then use the maximum quality (least 
>compression).  If you need the image to have a small file size and
>can afford the lower quality, use a higher compression ratio.

Can JPEG be set to preserve more of the information on horizontal
disparities between two images than it would ordinarily do, and still
get a reasonable amount of compression?

John R


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