Original Usenet thread from alt.ascii-art, started 28 Sep 2002.
making hidden ascii stereograms
alt.ascii-art
· 2 messages · 28 Sep 2002 - 28 Sep 2002
.............................................
A Method of creating Hidden Ascii Stereograms
.............................................
Ohex@ X Ohex@ X Ohex@ X Ohex@ X Ohex@ X Ohex@
O @ X O @ X O @ X O @ X O @ X O
O @ X O @ X O @ X O @ X O @ X O @
O @ X O @ X O @ X O @ X O @ X O
X O @ X O @ X O @ X O @ X O @ X O @
X O @ X O @ X O @ X O @ X O @ X O @
X O @ X O @ X O @ X O @ X O @ X O @
X O @ X O @ X O @ X O @ X O @ X O @
X O @ X O @ X O @ X O @ X O @ X O @
X O @ X O @ X O @ X O @ X O @ X O @
X O @ X O @ X O @ X O @ X O @ X O @
X O @ X O @ X O @ X O @ X O @ X O @
X O @ X O @ X O @ X O @ X O @ X O @
X O @ X O @ X O @ X O @ X O @ X O @
X O @ X O @ X O @ X O @ X O @ X O @
X O @ X O @ X O @ X O @ X O @ X O @
X O @ X O @ X O @ X O @ X O @ X O @
X O @ X O @ X O @ X O @ X O @ X O @
O @ X O @ X O @ X O @ X O @ X O
X O @ X O @ X O @ X O @ X O @ X O
O @ X O @ X O @ X O @ X O @ X O
XmjlO @ XmjlO @ XmjlO @ XmjlO @ XmjlO @ XmjlO
-----------------------------------------------------------------
The first step is to create a template. I use 3 distinct characters
each separated by 3 spaces:
g e m g e m g e m g e m g e m
g e m g e m g e m g e m g e m
g e m g e m g e m g e m g e m
From here we can either raise characters against the background, or
cause them to recede. I will describe how to make them raise.
-----------------------------------------------------------------
To bring a group of 3 adjacent characters forward is easy. It is just
a case of removing a space in the required place:
I have inserted a '<' where the space will be deleted:
x * @ x * @
g e m g e m g e < m g e m g e m
The result:
x * @ x * @
g e m g e m g e m g e m g e m
This should make the letters m, g and e move forward when viewed
stereoscopically. The symbols above the letters help to make
this clearer.
-----------------------------------------------------------------
The next step is to raise single characters. There is a technique for
doing this. I will show 2 methods (which are basically
the same) - method A and method B. First is method A.
Start with the template:
* *
g e m g e m g e m g e m g e m
I want to raise the letters marked '*' by bringing them closer
together. The result we are trying to achieve is this:
* *
g e m g e m g e m g e m g e m
In the following examples '<' will indicate deleting a space and '+'
will indicate adding a space:
Again.., starting with the template:
g e m g e m g e m g e m g e m
next..
1) g e m g e m g < e m g e m g e m
#) g e m g e m g e m g e m g e m
2) g e m g e m g e + m g e m g e m
#) g e m g e m g e m g e m g e m
Notice that step 2 creates a receding "shadow 'e' " (3 places to the
right of the raised one). We need to fix it:
3) g e m g e m g e m g < e + m g e m
#) g e m g e m g e m g e m g e m
The offending shadow has moved along another 3 places.. So repeat the
process until it disappears:
4) g e m g e m g e m g e m g < e + m
#) g e m g e m g e m g e m g e m
Giving the result shown at the beginning of this example.
-----------------------------------------------------------------
There is another way of getting much the same result - by moving in
the opposite direction. This is method B...
g e m g e m g e m g e m g e m
+ <
g e m g e m g e m g e m g e m
+ <
g e m g e m g e m g e m g e m
Like so. Now to compare the 2 results:
* *
g e m g e m g e m g e m g e m
method A: g e m g e m g e m g e m g e m
method B: g e m g e m g e m g e m g e m
Notice that the 'e's are not quite in the same position. Method B has
given a raised 'e' slightly further to the right. This
can be fixed by simply removing a character....
method B: g e m g e m g e m g e m g e m
<
method B: e m g e m g e m g e m g e m
method A: g e m g e m g e m g e m g e m
-----------------------------------------------------------------
Using methods A and B in conjunction ( e.g. alternating between the
two) can help in creating more balanced or symmetrical stereograms.
To make characters recede is the same methods but in reverse..
Have fun :)
--------------------------------------------------------------------
/|\ /|\ /|\ /|\ /|\ /|\
Michael Michael Michael Michael Michael Michael
< 002 > < 002 > < 002 > < 002 > < 002 > < 002 >
Michael Michael Michael Michael Michael Michael
\|/ \|/ \|/ \|/ \|/ \|/
e m g e m g e m g e m g e m g e m g
e m g e m g e m g e m g e m g e m g
e m g e m g e m g e m g e m g e m g
e m g e m g e m g e m g e m g e m g
e m g e m g e m g e m g e m g e m g
e m g e m g e m g e m g e m g e m g
e m g e m g e m g e m g e m g e m g
e m g e m g e m g e m g e m g e m g
magic3d magic3d magic3d magic3d magic3d magic3d
[Snip : anagrams] *weeps* Buhuhuuu .. I hate anagrams ! *sulk*
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__ . . __ (o.\ \/ /.o) \__\/\/__/ /O /==\ O\ (;O/ \/ \O;)
_______ |.-----.| || jgs || ||_ _|| `--)-(--` __[=== o]___ |:::::::::::|\ `-=========-`()
,sSSs ,SSSS_/ ,_ sS/`))\// sS//|_(_/ _, SS\\\ `""-.-'` / sSS` jgs-==-'`'-._\
___________ | _______ | | | | | | | | | | | | | | |_______| | |___________|
//O\\
|\/\/\/| | | | | | (o)(o) C _) | ,___| | / /____\
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