stereogram: small image of Saturn and its moons

In article <dljar1.770644942@giaeb>, dlj...@giaeb.cc.monash.edu.au (Dwayne Jarvis) writes...
> 
>>3-D space image, make your eyes go cross-eyed, left eye looking at the
>>left "o", right eye on the right "o" at the top of the image.  Saturn
>>and its moons will appear to be closer than the backround stars, and
>>the moons at various depths.
> 
>I dunno. I got the stars -behind- the planets only when I focussed
>outwards. Focussing in the cross-eye'd fashion made the stars apear
>in front of the planets. Weird X-).
> 
    [picture deleted]

You're right!  I just purchased two short books on stereograms and those
type of 3d pictures and it does mention the difference between the two
ways of viewing these images.  It calls them the parallel and the cross-
eyed techniques.  To briefly summarize a section of the book:  Looking
at the image one way (e.g. parallel technique) causes certain parts of the
image to stand out.  When the same image is viewed the other way (i.e. 
cross-eyed technique) the same sections now appear to recede into the image.
Using the wrong technique can cause certain images to appear nonsensical
(e.g. images of actual things rather than shapes or designs or something).
By the way, the cross-eyed technique tends to be easier because we can focus
our eyes in a much broader range when crossing them rather than attempting
to focus out at infinity (the parallel technique).

					-- James Marshall
					157...@ucis.vill.edu

In article <5JU...@cats.ucis.vill.edu>, 157...@cats.ucis.vill.edu (James J. Marshall) writes...
>In article <dljar1.770644942@giaeb>, dlj...@giaeb.cc.monash.edu.au (Dwayne Jarvis) writes...
>> 
>>>3-D space image, make your eyes go cross-eyed, left eye looking at the
>>>left "o", right eye on the right "o" at the top of the image.  Saturn
>>>and its moons will appear to be closer than the backround stars, and
>>>the moons at various depths.
>> 
>>I dunno. I got the stars -behind- the planets only when I focussed
>>outwards. Focussing in the cross-eye'd fashion made the stars apear
>>in front of the planets. Weird X-).
>> 
>    [picture deleted]
> 
>You're right!  I just purchased two short books on stereograms and those
>type of 3d pictures and it does mention the difference between the two
>ways of viewing these images.  It calls them the parallel and the cross-
>eyed techniques.  To briefly summarize a section of the book:  Looking
>at the image one way (e.g. parallel technique) causes certain parts of the
>image to stand out.  When the same image is viewed the other way (i.e. 
>cross-eyed technique) the same sections now appear to recede into the image.
>Using the wrong technique can cause certain images to appear nonsensical
>(e.g. images of actual things rather than shapes or designs or something).
>By the way, the cross-eyed technique tends to be easier because we can focus
>our eyes in a much broader range when crossing them rather than attempting
>to focus out at infinity (the parallel technique).
I almost forgot, using the parallel technique generally makes the picture
appear larger, while the cross-eyed technique generally makes the picture
appear smaller.
> 
>					-- James Marshall
>					157...@ucis.vill.edu

James Marshall:
>By the way, the cross-eyed technique tends to be easier because we can focus
>our eyes in a much broader range when crossing them rather than attempting
>to focus out at infinity (the parallel technique).

Is this really true?  I can't do the cross-eyed technique at all, but
the parallel technique gives me little trouble.  And almost all the
stereograms I've seen are meant to be viewed with the parallel
technique.

Or am I labelling the techniques the wrong way?  Parallel means left
eye looks at left image, right?
--