P3D Re: JPS format

["Ian Walker" <dimension.three@xxxxxxxxxx>]

>Somehow, I got the idea that it was nothing more than a
>pair of cross-eyed JPG images saved with a JPS extension. I've tried
>this with some of my images--it works to some extent--but they have
>nowhere near the quality of those on the VRex web site. Basically,
>all the images I create have seven horizontal banding, which I
>don't see in the images VRex has.

I have used the JPS format a lot on my web site.  My understanding
is that you are right - It is basically just two JPG format shots side by
side.
You can optionally add some header information which I don't believe will
effect the quality at all.  (I got a dos based utility from VREX which adds
this
information - some of the pictures on my site have it, some don't - the ones
that don't will give a warning in Depthcharge until you tell Depthcharge you
don't
want to see the warning).  I am not clear what additional use the header is
but
suspect that it identifies in some way the means of storage (side by side
being
the default)
I found that I got absolutely no loss of quality using JPS compared to JPG -
You
might be aware that the quality of a JPG format can be adjusted in relation
to the
size of the resulting image - The larger the file the higher the quality.
This will hold
true for the resulting JPS image.
When I started using JPS I used Paint Shop Pro and simply pasted two images
together.  Dan Shelly recommended 3d Stereo Image factory to me which is an
excellent package available from Softreet
( http://members.aol.com/threedr ).
I have a review of this package on my web site
( http://freespace.virgin.net\dimension.three ) if you would like more info.




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