Stereograms for Art Class

In article <2qalna$rf...@mercury.dur.ac.uk> 
N M Miners <N.M...@durham.ac.uk> writes:
>There's a problem here - Stereograms are generally computer generated and 
>as such are probably impossible to recreate using charcoal, chalk and pastel.

Salvador Dali did a stereo pair in oils, so nyaah.
However it might be better and a lot easier to use photograpy if you can
get to do your own colour printing.

-- 
Richard Kirk         Image Processing Group    Crosfield Electronics Ltd. U.K.
ra...@crosfield.co.uk  0442-230000 x3361/3591    Hemel Hempstead, Herts, HP2 7RH

Richard Kirk (ra...@crosfield.co.uk) wrote:
: In article <2qalna$rf...@mercury.dur.ac.uk> 
: N M Miners <N.M...@durham.ac.uk> writes:
: >There's a problem here - Stereograms are generally computer generated and 
: >as such are probably impossible to recreate using charcoal, chalk and pastel.

: Salvador Dali did a stereo pair in oils, so nyaah.
: However it might be better and a lot easier to use photograpy if you can
: get to do your own colour printing.

Have you got a GIF of that? I'd be very interested...

Nick

In article <2qalna$rf...@mercury.dur.ac.uk>, N M Miners
<N.M...@durham.ac.uk> wrote:

> Bryan D Levenson (ble...@magnus.acs.ohio-state.edu) wrote:
> : [snip-o]
> : What I need you brilliant people to help me with is this: what is the idea 
> : behind seeing them or not seeing them. How can I use these media to create
> one 

> There's a problem here - Stereograms are generally computer generated and 
> as such are probably impossible to recreate using charcoal, chalk and pastel.
> 
> To view stereograms takes patience and practice, but the results ARE (or 
> rather CAN BE) impressive.  If you look carefully you'll generallt find a 
> repeated pattern of dots (or whatever the SG is made up from).  You need 
> to `uncross' your eyes (like going crosseyed only in reverse - a bit 
> harder, I have always thought) as if you were looking at something behind 
> the plane of the SG (it helps sometimes to put a pane of glass ov

The concept (i've recently found out) is that of "Hypersight" (ooo, I love
it!, Hyper-anything!)  the ability to 'overextend' your focal vision.  You
stare at your reflection is a pane of glass to help you see twice as far as
the image is from you.  Once you become pretty good at it, you can look at
a plane sheet of paper, or a Usenet article, with one on it and 'force' the
image to pop out. 

Best of luck, they are a pretty cool idea.  Anyone know the source?
-Neil

-- 
::   Neil p Corcoran    :: //  SocioCyber Anthropology    | memetic\.....
<cor...@student.msu.edu>//______________________________| '''''\conduit
 :Guerilla Semiotician:  / "TV is not feeding us what we want; there's no  
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From Felix Lee

  Felix suggested some simplification- starting again from the original,
how's this?

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Wills


Here's the original
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Artist unknown

::::::
:: William "Wills" Towle :  csz...@scs.leeds.ac.uk (csz...@gps.leeds.ac.uk)
::    "Keyboard not responding. Press ENTER to continue" - PC error message

Wills Towl:
>  Felix suggested some simplification- starting again from the original,
>how's this?
	[picture deleted]

Not bad.  I like what you did to the nose.  Making it clear space was
a good idea; it increases the tonal range of the small picture.

Here's something silly I just did.  I took the original Thumper
picture, displayed it in a window, dumped the bitmap, converted it to
a GIF, and then ran it through gifscii, to get a 24-line picture.  The
result is a mess.  Fiddling with the contrast and brightness doesn't
help much.  The picture below was the best I could get.  So much for
my hopes for an automatic pantograph for ascii pictures...

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Here's a second attempt at automatic reduction of the Thumper picture.
This time, I used "xv" to fiddle the GIF of the original ascii
picture, before feeding it to gifscii.

I applied smoothing to blur the ascii characters a bit, then applied a
gamma function to intensity, to normalize the brightness and contrast
of the picture.  (xv gives you more flexibility than gifscii.)

The gifscii results are much better now, but still not as clear as the
manual reductions...

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