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ASG/Text

This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.

Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.

Tape/disk: Home » Personal collection » Acorn ADFS disks » Electron » EUG_submission_2.ADF
Filename: ASG/Text
Read OK: ✔
File size: 2156 bytes
Load address: 54204556
Exec address: D747865
Duplicates

There is 1 duplicate copy of this file in the archive:

File contents
�.........*.......*.......*.......*.......*.......*.......*.......*.......*.<
                        Autostereogram Generator

       An autostereogram is a repeating pattern of dots which reveals a
convincing 3-dimensional illusion if viewed correctly. They have become
popularly known as "Magic Eye" pictures after the recent series of books,
and can also be found on posters in art shops. They are generated using
computer programs, so I set about writing a program to produce them on the
Electron.
       I found a simple routine to do this, in the New Scientist magazine
last year, written in the "C" programming language, and understood enough
of it to write a version in BASIC. Unfortunately, this took over 4 hours
to run, and was only capable of producing images of very simple shapes, so
it soon became evident that a machine code version was needed. I have now
written a version which can produce virtually any image, and  never takes
more than 45 minutes to run (it will often run in under 10). I admit this
is still slow - the program is held up by needing to use BASIC's  RND
function to generate random numbers.
       To produce an autostereogram, you will need a picture, to supply
the 3-D image that you will see. This can be a screen file in any graphics
mode (0,1,2,4,5), but must have a very clear outline, particularly on the
first one you try. The colours of the picture are used to tell the program
how far in front of the page each part of the image will appear - so don't
use them to make the picture look pretty or realistic. There is no concept
of colour in the illusions themselves.
       If the picture is fairly simple, you can draw it just using BASIC's
grapics commands, and PLOT 85 to fill areas with colour, then save it
using "*SAVE <filename> 3000 8000" for a MODE 0,1 or 2 screen, or "*SAVE
<filename> 5800 8000" for a MODE 4 or 5 screen. However, it is probably
easier to use an art program such as Elkpaint (Electon User, October
1989). You will find a copy of this on the disc, with a couple of minor
improvements made to the load/save routine. The keys are as follows:
       Z,X,*,? : Move cursor        S : Store screen in memory
           0-3 : Choose colour      U : Swap to stored screen
   SHIFT + 1-6 : Choose speed       T : Text
             B : Rubberband       Q+W : Clear screen
             C : Circle             K : Save screen
             E : Ellipse            L : Load screen
             R : Rectangle          M : Magnify (cursors scroll view)
    A then 1-5 : Brush mode         F : Fill
             P : Cut + paste ( use space bar to fix area to cut, drag box 
                                to new position, press Return, then:
                               Space for a normal copy
                               H for a horizontal flip
                               V for a vertical flip
                               R to rotate (Z and X rotate about bottom
                                left corner, then space to fix)
         Space : Confirm/fix/draw in brush and magnify modes
        Return : Exit brush/magnify modes

       When you have a picture ready, run the autostereogram generator.
You will first need to enter the filename of the source picture, and its
mode (this will be 5 if you used Elkpaint). Next, enter the filename you
wish to save the autostereogram under, and its mode (0 or 4). The dot
resolution in mode 0 is twice that in mode 4, but in my opinion, the
images are easier to see in mode 4. They are also much quicker to produce
in mode 4.
      Next you must enter the "eye separation". This will be the distance
between the repeating patterns on the page, and hence relates to the
amount you have to cross your eyes to see the illusion (if you use my
small screen dump, this will be in millimetres). I find it easiest to see
the images if I use an eye separation of about 20, though this is much
less than in most commercial autostereograms.
      Next, you will be asked to enter an "elevation number" for each
logical colour used in the source picture. This is a measure of how far in
front of the page each part of the image will appear. The higher the
number, the more the illusion stands out, so you should enter 0 for the
background colour. I use a value of 4 for most images, though you can vary
this from about 2 to 10 to get a good 3-D effect. It is important that you
remember which logical colours you used for which parts of the picture. If
you use mode 0, you should double the values mentioned above (which refer
to mode 4). Similarly, if you alter the eye separation, you should change
the elevation numbers in approximately the same ratio.
       Finally, you will be asked if you want a printed copy. I have
written my own single-shade screen dump for this purpose. This must be
saved in the same directory as the autostereogram generator, under the
filename "ScrDump" (sorry about the total lack of meaningful labels and
variable names in this program!). You may prefer to use the dump from
"Diagram", which I have also improved. This is twice as fast as mine, and
the same shape, but is 50% wider, filling the full width of the carriage.
This machine code program is saved as  "UCODE". There is an option to
select between these two dumps (small and large respectively).
       Now just sit back and wait for the result. This could take up to 45
minutes if you are using mode 0, so be patient if the computer appears to
be doing nothing for a long period.
       All these parameters will sound rather complicated if you have
never actually seen an autostereogram before, but don't worry - just use
my suggested values to get you started. Then you can try varying them
later, one at a time, to see the effects.
       You may be able to see the effect on your TV/monitor screen if it
is not too flickery, though it is generally easier on paper. My preferred
method is to stare blankly at the page, and slowly refocus my eyes until
two columns of the repeating pattern appear to merge into one. Then, if
you can hold your focus long enough on the merged pattern, the image
should lift out.
       Other people prefer the following method: Hold the paper against
your face, and stare through it blankly. Slowly move the paper away from
your face without altering your focus, until the image appears, then wait
until it becomes clear. You will have to concentrate very hard to prevent
yourself from refocusing on the image as it appears.
       Another method is to place a reflective surface over  the page, and
focus on your reflection (a TV/monitor screen might also work). I have
never found this method useful myself.
       You will probably find that you have to stare at them for a long
time before you see the effect for the first time (it took me several
hours), but it is well worth the wait. If you still can't see them, don't
worry - apparently an estimated 10% of the population can never see them.
       The autostereograms produced by this program are not as effective
as the commercial ones (though they may be easier to see). This is partly
because they are black and white, and the patterns are not attractive in
themselves, as they are generated randomly. However, another serious
limitation is that the images you see are always parallel to the paper -
they can never slope towards or away from you. I have tried to make
sloping surfaces using a "staircase" effect - several narrow bands of mode
2 colours, with consecutive elevation numbers. However, the resolution of
mode 0 graphics was not really enough to make this successful.
       You may wish to produce an autostereogram of a word, or short
phrase. If so, I have sent in a  program to print large text on the
screen. This is based on the Banner Printing program from Electron User
(June 1989), and is described elsewhere on the disc.
       If you produce an impressive image, send it in! Perhaps this could
be the basis of a future competition, (i.e "What object is shown in this
autostereogram?", with the source picture included on the following disc)
       I have included an example of an autostereogram on the disc. The
source picture is also there, but you may prefer not to see this until you
have had a go at seeing the image. Good luck!
                                                   Matthew Ford.

00000000  81 2e 2e 2e 2e 2e 2e 2e  2e 2e 2a 2e 2e 2e 2e 2e  |..........*.....|
00000010  2e 2e 2a 2e 2e 2e 2e 2e  2e 2e 2a 2e 2e 2e 2e 2e  |..*.......*.....|
*
00000040  2e 2e 2a 2e 2e 2e 2e 2e  2e 2e 2a 2e 3c 0d 20 20  |..*.......*.<.  |
00000050  20 20 20 20 20 20 20 20  20 20 20 20 20 20 20 20  |                |
00000060  20 20 20 20 20 20 41 75  74 6f 73 74 65 72 65 6f  |      Autostereo|
00000070  67 72 61 6d 20 47 65 6e  65 72 61 74 6f 72 0d 0d  |gram Generator..|
00000080  20 20 20 20 20 20 20 41  6e 20 61 75 74 6f 73 74  |       An autost|
00000090  65 72 65 6f 67 72 61 6d  20 69 73 20 61 20 72 65  |ereogram is a re|
000000a0  70 65 61 74 69 6e 67 1a  20 70 61 74 74 65 72 6e  |peating. pattern|
000000b0  1a 20 6f 66 1a 20 64 6f  74 73 20 77 68 69 63 68  |. of. dots which|
000000c0  20 72 65 76 65 61 6c 73  20 61 0d 63 6f 6e 76 69  | reveals a.convi|
000000d0  6e 63 69 6e 67 1a 20 33  2d 64 69 6d 65 6e 73 69  |ncing. 3-dimensi|
000000e0  6f 6e 61 6c 1a 20 69 6c  6c 75 73 69 6f 6e 1a 20  |onal. illusion. |
000000f0  69 66 20 76 69 65 77 65  64 20 63 6f 72 72 65 63  |if viewed correc|
00000100  74 6c 79 2e 20 54 68 65  79 20 68 61 76 65 20 62  |tly. They have b|
00000110  65 63 6f 6d 65 0d 70 6f  70 75 6c 61 72 6c 79 20  |ecome.popularly |
00000120  6b 6e 6f 77 6e 20 61 73  20 22 4d 61 67 69 63 1a  |known as "Magic.|
00000130  20 45 79 65 22 20 70 69  63 74 75 72 65 73 20 61  | Eye" pictures a|
00000140  66 74 65 72 20 74 68 65  20 72 65 63 65 6e 74 20  |fter the recent |
00000150  73 65 72 69 65 73 20 6f  66 20 62 6f 6f 6b 73 2c  |series of books,|
00000160  0d 61 6e 64 20 63 61 6e  20 61 6c 73 6f 20 62 65  |.and can also be|
00000170  20 66 6f 75 6e 64 1a 20  6f 6e 1a 20 70 6f 73 74  | found. on. post|
00000180  65 72 73 1a 20 69 6e 20  61 72 74 20 73 68 6f 70  |ers. in art shop|
00000190  73 2e 20 54 68 65 79 20  61 72 65 20 67 65 6e 65  |s. They are gene|
000001a0  72 61 74 65 64 20 75 73  69 6e 67 0d 63 6f 6d 70  |rated using.comp|
000001b0  75 74 65 72 20 70 72 6f  67 72 61 6d 73 2c 20 73  |uter programs, s|
000001c0  6f 20 49 20 73 65 74 20  61 62 6f 75 74 20 77 72  |o I set about wr|
000001d0  69 74 69 6e 67 20 61 20  70 72 6f 67 72 61 6d 20  |iting a program |
000001e0  74 6f 20 70 72 6f 64 75  63 65 20 74 68 65 6d 20  |to produce them |
000001f0  6f 6e 20 74 68 65 0d 45  6c 65 63 74 72 6f 6e 2e  |on the.Electron.|
00000200  0d 20 20 20 20 20 20 20  49 20 66 6f 75 6e 64 20  |.       I found |
00000210  61 20 73 69 6d 70 6c 65  20 72 6f 75 74 69 6e 65  |a simple routine|
00000220  1a 20 74 6f 20 64 6f 20  74 68 69 73 2c 20 69 6e  |. to do this, in|
00000230  20 74 68 65 20 4e 65 77  20 53 63 69 65 6e 74 69  | the New Scienti|
00000240  73 74 20 6d 61 67 61 7a  69 6e 65 0d 6c 61 73 74  |st magazine.last|
00000250  20 79 65 61 72 2c 20 77  72 69 74 74 65 6e 20 69  | year, written i|
00000260  6e 20 74 68 65 20 22 43  22 1a 20 70 72 6f 67 72  |n the "C". progr|
00000270  61 6d 6d 69 6e 67 20 6c  61 6e 67 75 61 67 65 2c  |amming language,|
00000280  20 61 6e 64 20 75 6e 64  65 72 73 74 6f 6f 64 20  | and understood |
00000290  65 6e 6f 75 67 68 0d 6f  66 20 69 74 20 74 6f 20  |enough.of it to |
000002a0  77 72 69 74 65 20 61 20  76 65 72 73 69 6f 6e 20  |write a version |
000002b0  69 6e 1a 20 42 41 53 49  43 2e 1a 20 55 6e 66 6f  |in. BASIC.. Unfo|
000002c0  72 74 75 6e 61 74 65 6c  79 2c 20 74 68 69 73 20  |rtunately, this |
000002d0  74 6f 6f 6b 20 6f 76 65  72 20 34 20 68 6f 75 72  |took over 4 hour|
000002e0  73 0d 74 6f 20 72 75 6e  2c 20 61 6e 64 20 77 61  |s.to run, and wa|
000002f0  73 20 6f 6e 6c 79 20 63  61 70 61 62 6c 65 20 6f  |s only capable o|
00000300  66 20 70 72 6f 64 75 63  69 6e 67 20 69 6d 61 67  |f producing imag|
00000310  65 73 20 6f 66 20 76 65  72 79 20 73 69 6d 70 6c  |es of very simpl|
00000320  65 20 73 68 61 70 65 73  2c 20 73 6f 0d 69 74 20  |e shapes, so.it |
00000330  73 6f 6f 6e 20 62 65 63  61 6d 65 20 65 76 69 64  |soon became evid|
00000340  65 6e 74 20 74 68 61 74  20 61 20 6d 61 63 68 69  |ent that a machi|
00000350  6e 65 20 63 6f 64 65 20  76 65 72 73 69 6f 6e 1a  |ne code version.|
00000360  20 77 61 73 20 6e 65 65  64 65 64 2e 20 49 20 68  | was needed. I h|
00000370  61 76 65 20 6e 6f 77 0d  77 72 69 74 74 65 6e 20  |ave now.written |
00000380  61 20 76 65 72 73 69 6f  6e 20 77 68 69 63 68 20  |a version which |
00000390  63 61 6e 20 70 72 6f 64  75 63 65 20 76 69 72 74  |can produce virt|
000003a0  75 61 6c 6c 79 20 61 6e  79 20 69 6d 61 67 65 2c  |ually any image,|
000003b0  20 61 6e 64 1a 20 20 6e  65 76 65 72 20 74 61 6b  | and.  never tak|
000003c0  65 73 0d 6d 6f 72 65 20  74 68 61 6e 20 34 35 20  |es.more than 45 |
000003d0  6d 69 6e 75 74 65 73 20  74 6f 20 72 75 6e 20 28  |minutes to run (|
000003e0  69 74 20 77 69 6c 6c 20  6f 66 74 65 6e 20 72 75  |it will often ru|
000003f0  6e 20 69 6e 1a 20 75 6e  64 65 72 20 31 30 29 2e  |n in. under 10).|
00000400  20 49 20 61 64 6d 69 74  20 74 68 69 73 0d 69 73  | I admit this.is|
00000410  1a 20 73 74 69 6c 6c 1a  20 73 6c 6f 77 20 2d 20  |. still. slow - |
00000420  74 68 65 20 70 72 6f 67  72 61 6d 20 69 73 20 68  |the program is h|
00000430  65 6c 64 20 75 70 20 62  79 20 6e 65 65 64 69 6e  |eld up by needin|
00000440  67 20 74 6f 1a 20 75 73  65 1a 20 42 41 53 49 43  |g to. use. BASIC|
00000450  27 73 1a 20 20 52 4e 44  0d 66 75 6e 63 74 69 6f  |'s.  RND.functio|
00000460  6e 20 74 6f 20 67 65 6e  65 72 61 74 65 20 72 61  |n to generate ra|
00000470  6e 64 6f 6d 20 6e 75 6d  62 65 72 73 2e 0d 20 20  |ndom numbers..  |
00000480  20 20 20 20 20 54 6f 20  70 72 6f 64 75 63 65 20  |     To produce |
00000490  61 6e 20 61 75 74 6f 73  74 65 72 65 6f 67 72 61  |an autostereogra|
000004a0  6d 2c 20 79 6f 75 1a 20  77 69 6c 6c 1a 20 6e 65  |m, you. will. ne|
000004b0  65 64 1a 20 61 20 70 69  63 74 75 72 65 2c 20 74  |ed. a picture, t|
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000004d0  20 69 6d 61 67 65 20 74  68 61 74 20 79 6f 75 20  | image that you |
000004e0  77 69 6c 6c 20 73 65 65  2e 20 54 68 69 73 20 63  |will see. This c|
000004f0  61 6e 20 62 65 20 61 20  73 63 72 65 65 6e 20 66  |an be a screen f|
00000500  69 6c 65 20 69 6e 20 61  6e 79 20 67 72 61 70 68  |ile in any graph|
00000510  69 63 73 0d 6d 6f 64 65  20 28 30 2c 31 2c 32 2c  |ics.mode (0,1,2,|
00000520  34 2c 35 29 2c 20 62 75  74 20 6d 75 73 74 20 68  |4,5), but must h|
00000530  61 76 65 20 61 20 76 65  72 79 20 63 6c 65 61 72  |ave a very clear|
00000540  1a 20 6f 75 74 6c 69 6e  65 2c 20 70 61 72 74 69  |. outline, parti|
00000550  63 75 6c 61 72 6c 79 20  6f 6e 20 74 68 65 0d 66  |cularly on the.f|
00000560  69 72 73 74 20 6f 6e 65  20 79 6f 75 20 74 72 79  |irst one you try|
00000570  2e 20 54 68 65 20 63 6f  6c 6f 75 72 73 20 6f 66  |. The colours of|
00000580  20 74 68 65 20 70 69 63  74 75 72 65 20 61 72 65  | the picture are|
00000590  20 75 73 65 64 20 74 6f  20 74 65 6c 6c 20 74 68  | used to tell th|
000005a0  65 20 70 72 6f 67 72 61  6d 0d 68 6f 77 20 66 61  |e program.how fa|
000005b0  72 20 69 6e 20 66 72 6f  6e 74 20 6f 66 20 74 68  |r in front of th|
000005c0  65 20 70 61 67 65 20 65  61 63 68 20 70 61 72 74  |e page each part|
000005d0  20 6f 66 20 74 68 65 20  69 6d 61 67 65 20 77 69  | of the image wi|
000005e0  6c 6c 20 61 70 70 65 61  72 20 2d 20 73 6f 20 64  |ll appear - so d|
000005f0  6f 6e 27 74 0d 75 73 65  20 74 68 65 6d 20 74 6f  |on't.use them to|
00000600  20 6d 61 6b 65 20 74 68  65 20 70 69 63 74 75 72  | make the pictur|
00000610  65 20 6c 6f 6f 6b 20 70  72 65 74 74 79 20 6f 72  |e look pretty or|
00000620  20 72 65 61 6c 69 73 74  69 63 2e 20 54 68 65 72  | realistic. Ther|
00000630  65 20 69 73 20 6e 6f 20  63 6f 6e 63 65 70 74 0d  |e is no concept.|
00000640  6f 66 20 63 6f 6c 6f 75  72 20 69 6e 20 74 68 65  |of colour in the|
00000650  20 69 6c 6c 75 73 69 6f  6e 73 20 74 68 65 6d 73  | illusions thems|
00000660  65 6c 76 65 73 2e 0d 20  20 20 20 20 20 20 49 66  |elves..       If|
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00000690  6f 75 20 63 61 6e 20 64  72 61 77 20 69 74 20 6a  |ou can draw it j|
000006a0  75 73 74 20 75 73 69 6e  67 20 42 41 53 49 43 27  |ust using BASIC'|
000006b0  73 0d 67 72 61 70 69 63  73 20 63 6f 6d 6d 61 6e  |s.grapics comman|
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000006d0  20 74 6f 1a 20 66 69 6c  6c 1a 20 61 72 65 61 73  | to. fill. areas|
000006e0  1a 20 77 69 74 68 1a 20  63 6f 6c 6f 75 72 2c 20  |. with. colour, |
000006f0  74 68 65 6e 20 73 61 76  65 20 69 74 0d 75 73 69  |then save it.usi|
00000700  6e 67 20 22 2a 53 41 56  45 20 3c 66 69 6c 65 6e  |ng "*SAVE <filen|
00000710  61 6d 65 3e 20 33 30 30  30 20 38 30 30 30 22 20  |ame> 3000 8000" |
00000720  66 6f 72 20 61 20 4d 4f  44 45 20 30 2c 31 20 6f  |for a MODE 0,1 o|
00000730  72 1a 20 32 1a 20 73 63  72 65 65 6e 2c 20 6f 72  |r. 2. screen, or|
00000740  20 22 2a 53 41 56 45 0d  3c 66 69 6c 65 6e 61 6d  | "*SAVE.<filenam|
00000750  65 3e 1a 20 35 38 30 30  20 38 30 30 30 22 20 66  |e>. 5800 8000" f|
00000760  6f 72 20 61 20 4d 4f 44  45 20 34 20 6f 72 20 35  |or a MODE 4 or 5|
00000770  20 73 63 72 65 65 6e 2e  20 48 6f 77 65 76 65 72  | screen. However|
00000780  2c 20 69 74 1a 20 69 73  1a 20 70 72 6f 62 61 62  |, it. is. probab|
00000790  6c 79 0d 65 61 73 69 65  72 20 74 6f 1a 20 75 73  |ly.easier to. us|
000007a0  65 1a 20 61 6e 1a 20 61  72 74 1a 20 70 72 6f 67  |e. an. art. prog|
000007b0  72 61 6d 1a 20 73 75 63  68 1a 20 61 73 20 45 6c  |ram. such. as El|
000007c0  6b 70 61 69 6e 74 20 28  45 6c 65 63 74 6f 6e 20  |kpaint (Electon |
000007d0  55 73 65 72 2c 20 4f 63  74 6f 62 65 72 0d 31 39  |User, October.19|
000007e0  38 39 29 2e 20 59 6f 75  20 77 69 6c 6c 20 66 69  |89). You will fi|
000007f0  6e 64 20 61 20 63 6f 70  79 20 6f 66 20 74 68 69  |nd a copy of thi|
00000800  73 1a 20 6f 6e 1a 20 74  68 65 1a 20 64 69 73 63  |s. on. the. disc|
00000810  2c 20 77 69 74 68 20 61  20 63 6f 75 70 6c 65 20  |, with a couple |
00000820  6f 66 20 6d 69 6e 6f 72  0d 69 6d 70 72 6f 76 65  |of minor.improve|
00000830  6d 65 6e 74 73 20 6d 61  64 65 20 74 6f 20 74 68  |ments made to th|
00000840  65 20 6c 6f 61 64 2f 73  61 76 65 20 72 6f 75 74  |e load/save rout|
00000850  69 6e 65 2e 20 54 68 65  20 6b 65 79 73 20 61 72  |ine. The keys ar|
00000860  65 20 61 73 20 66 6f 6c  6c 6f 77 73 3a 0d 20 20  |e as follows:.  |
00000870  20 20 20 20 20 5a 2c 58  2c 2a 2c 3f 20 3a 20 4d  |     Z,X,*,? : M|
00000880  6f 76 65 20 63 75 72 73  6f 72 20 20 20 20 20 20  |ove cursor      |
00000890  20 20 53 20 3a 20 53 74  6f 72 65 20 73 63 72 65  |  S : Store scre|
000008a0  65 6e 20 69 6e 20 6d 65  6d 6f 72 79 0d 20 20 20  |en in memory.   |
000008b0  20 20 20 20 20 20 20 20  30 2d 33 20 3a 20 43 68  |        0-3 : Ch|
000008c0  6f 6f 73 65 20 63 6f 6c  6f 75 72 20 20 20 20 20  |oose colour     |
000008d0  20 55 20 3a 20 53 77 61  70 20 74 6f 20 73 74 6f  | U : Swap to sto|
000008e0  72 65 64 20 73 63 72 65  65 6e 0d 20 20 20 53 48  |red screen.   SH|
000008f0  49 46 54 20 2b 20 31 2d  36 20 3a 20 43 68 6f 6f  |IFT + 1-6 : Choo|
00000900  73 65 20 73 70 65 65 64  20 20 20 20 20 20 20 54  |se speed       T|
00000910  20 3a 20 54 65 78 74 0d  20 20 20 20 20 20 20 20  | : Text.        |
00000920  20 20 20 20 20 42 20 3a  20 52 75 62 62 65 72 62  |     B : Rubberb|
00000930  61 6e 64 20 20 20 20 20  20 20 51 2b 57 20 3a 20  |and       Q+W : |
00000940  43 6c 65 61 72 20 73 63  72 65 65 6e 0d 20 20 20  |Clear screen.   |
00000950  20 20 20 20 20 20 20 20  20 20 43 20 3a 20 43 69  |          C : Ci|
00000960  72 63 6c 65 20 20 20 20  20 20 20 20 20 20 20 20  |rcle            |
00000970  20 4b 20 3a 20 53 61 76  65 20 73 63 72 65 65 6e  | K : Save screen|
00000980  0d 20 20 20 20 20 20 20  20 20 20 20 20 20 45 20  |.             E |
00000990  3a 20 45 6c 6c 69 70 73  65 20 20 20 20 20 20 20  |: Ellipse       |
000009a0  20 20 20 20 20 4c 20 3a  20 4c 6f 61 64 20 73 63  |     L : Load sc|
000009b0  72 65 65 6e 0d 20 20 20  20 20 20 20 20 20 20 20  |reen.           |
000009c0  20 20 52 20 3a 20 52 65  63 74 61 6e 67 6c 65 20  |  R : Rectangle |
000009d0  20 20 20 20 20 20 20 20  20 4d 20 3a 20 4d 61 67  |         M : Mag|
000009e0  6e 69 66 79 20 28 63 75  72 73 6f 72 73 20 73 63  |nify (cursors sc|
000009f0  72 6f 6c 6c 20 76 69 65  77 29 0d 20 20 20 20 41  |roll view).    A|
00000a00  20 74 68 65 6e 20 31 2d  35 20 3a 20 42 72 75 73  | then 1-5 : Brus|
00000a10  68 20 6d 6f 64 65 20 20  20 20 20 20 20 20 20 46  |h mode         F|
00000a20  20 3a 20 46 69 6c 6c 0d  20 20 20 20 20 20 20 20  | : Fill.        |
00000a30  20 20 20 20 20 50 20 3a  20 43 75 74 20 2b 20 70  |     P : Cut + p|
00000a40  61 73 74 65 20 28 20 75  73 65 20 73 70 61 63 65  |aste ( use space|
00000a50  20 62 61 72 20 74 6f 20  66 69 78 20 61 72 65 61  | bar to fix area|
00000a60  20 74 6f 20 63 75 74 2c  20 64 72 61 67 20 62 6f  | to cut, drag bo|
00000a70  78 20 0d 20 20 20 20 20  20 20 20 20 20 20 20 20  |x .             |
00000a80  20 20 20 20 20 20 20 20  20 20 20 20 20 20 20 20  |                |
00000a90  20 20 20 74 6f 20 6e 65  77 20 70 6f 73 69 74 69  |   to new positi|
00000aa0  6f 6e 2c 20 70 72 65 73  73 20 52 65 74 75 72 6e  |on, press Return|
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00001990  20 76 65 72 79 20 68 61  72 64 1a 20 74 6f 20 70  | very hard. to p|
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000019b0  66 72 6f 6d 20 72 65 66  6f 63 75 73 69 6e 67 20  |from refocusing |
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00001a40  28 61 1a 20 54 56 2f 6d  6f 6e 69 74 6f 72 1a 20  |(a. TV/monitor. |
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00001a90  20 6d 79 73 65 6c 66 2e  0d 20 20 20 20 20 20 20  | myself..       |
00001aa0  59 6f 75 20 77 69 6c 6c  20 70 72 6f 62 61 62 6c  |You will probabl|
00001ab0  79 20 66 69 6e 64 20 74  68 61 74 1a 20 79 6f 75  |y find that. you|
00001ac0  1a 20 68 61 76 65 1a 20  74 6f 20 73 74 61 72 65  |. have. to stare|
00001ad0  20 61 74 20 74 68 65 6d  20 66 6f 72 20 61 20 6c  | at them for a l|
00001ae0  6f 6e 67 0d 74 69 6d 65  20 62 65 66 6f 72 65 20  |ong.time before |
00001af0  79 6f 75 20 73 65 65 20  74 68 65 20 65 66 66 65  |you see the effe|
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00001b10  74 1a 20 74 69 6d 65 1a  20 28 69 74 1a 20 74 6f  |t. time. (it. to|
00001b20  6f 6b 1a 20 6d 65 20 73  65 76 65 72 61 6c 0d 68  |ok. me several.h|
00001b30  6f 75 72 73 29 2c 20 62  75 74 20 69 74 20 69 73  |ours), but it is|
00001b40  20 77 65 6c 6c 20 77 6f  72 74 68 20 74 68 65 20  | well worth the |
00001b50  77 61 69 74 2e 20 49 66  20 79 6f 75 20 73 74 69  |wait. If you sti|
00001b60  6c 6c 20 63 61 6e 27 74  20 73 65 65 1a 20 74 68  |ll can't see. th|
00001b70  65 6d 2c 20 64 6f 6e 27  74 0d 77 6f 72 72 79 20  |em, don't.worry |
00001b80  2d 20 61 70 70 61 72 65  6e 74 6c 79 20 61 6e 20  |- apparently an |
00001b90  65 73 74 69 6d 61 74 65  64 20 31 30 25 20 6f 66  |estimated 10% of|
00001ba0  20 74 68 65 20 70 6f 70  75 6c 61 74 69 6f 6e 20  | the population |
00001bb0  63 61 6e 20 6e 65 76 65  72 20 73 65 65 20 74 68  |can never see th|
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00001bd0  75 74 6f 73 74 65 72 65  6f 67 72 61 6d 73 20 70  |utostereograms p|
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00001bf0  20 70 72 6f 67 72 61 6d  1a 20 61 72 65 20 6e 6f  | program. are no|
00001c00  74 20 61 73 20 65 66 66  65 63 74 69 76 65 0d 61  |t as effective.a|
00001c10  73 20 74 68 65 20 63 6f  6d 6d 65 72 63 69 61 6c  |s the commercial|
00001c20  20 6f 6e 65 73 20 28 74  68 6f 75 67 68 20 74 68  | ones (though th|
00001c30  65 79 20 6d 61 79 1a 20  62 65 20 65 61 73 69 65  |ey may. be easie|
00001c40  72 20 74 6f 20 73 65 65  29 2e 20 54 68 69 73 20  |r to see). This |
00001c50  69 73 20 70 61 72 74 6c  79 0d 62 65 63 61 75 73  |is partly.becaus|
00001c60  65 20 74 68 65 79 20 61  72 65 20 62 6c 61 63 6b  |e they are black|
00001c70  20 61 6e 64 20 77 68 69  74 65 2c 20 61 6e 64 20  | and white, and |
00001c80  74 68 65 1a 20 70 61 74  74 65 72 6e 73 1a 20 61  |the. patterns. a|
00001c90  72 65 20 6e 6f 74 20 61  74 74 72 61 63 74 69 76  |re not attractiv|
00001ca0  65 20 69 6e 0d 74 68 65  6d 73 65 6c 76 65 73 2c  |e in.themselves,|
00001cb0  1a 20 61 73 1a 20 74 68  65 79 1a 20 61 72 65 1a  |. as. they. are.|
00001cc0  20 67 65 6e 65 72 61 74  65 64 1a 20 72 61 6e 64  | generated. rand|
00001cd0  6f 6d 6c 79 2e 1a 20 48  6f 77 65 76 65 72 2c 20  |omly.. However, |
00001ce0  61 6e 6f 74 68 65 72 20  73 65 72 69 6f 75 73 0d  |another serious.|
00001cf0  6c 69 6d 69 74 61 74 69  6f 6e 20 69 73 20 74 68  |limitation is th|
00001d00  61 74 20 74 68 65 20 69  6d 61 67 65 73 20 79 6f  |at the images yo|
00001d10  75 20 73 65 65 1a 20 61  72 65 1a 20 61 6c 77 61  |u see. are. alwa|
00001d20  79 73 20 70 61 72 61 6c  6c 65 6c 20 74 6f 20 74  |ys parallel to t|
00001d30  68 65 20 70 61 70 65 72  20 2d 0d 74 68 65 79 1a  |he paper -.they.|
00001d40  20 63 61 6e 1a 20 6e 65  76 65 72 20 73 6c 6f 70  | can. never slop|
00001d50  65 20 74 6f 77 61 72 64  73 20 6f 72 20 61 77 61  |e towards or awa|
00001d60  79 20 66 72 6f 6d 20 79  6f 75 2e 1a 20 49 1a 20  |y from you.. I. |
00001d70  68 61 76 65 1a 20 74 72  69 65 64 1a 20 74 6f 1a  |have. tried. to.|
00001d80  20 6d 61 6b 65 0d 73 6c  6f 70 69 6e 67 20 73 75  | make.sloping su|
00001d90  72 66 61 63 65 73 20 75  73 69 6e 67 20 61 20 22  |rfaces using a "|
00001da0  73 74 61 69 72 63 61 73  65 22 20 65 66 66 65 63  |staircase" effec|
00001db0  74 20 2d 20 73 65 76 65  72 61 6c 20 6e 61 72 72  |t - several narr|
00001dc0  6f 77 20 62 61 6e 64 73  20 6f 66 20 6d 6f 64 65  |ow bands of mode|
00001dd0  0d 32 20 63 6f 6c 6f 75  72 73 2c 20 77 69 74 68  |.2 colours, with|
00001de0  1a 20 63 6f 6e 73 65 63  75 74 69 76 65 20 65 6c  |. consecutive el|
00001df0  65 76 61 74 69 6f 6e 20  6e 75 6d 62 65 72 73 2e  |evation numbers.|
00001e00  20 48 6f 77 65 76 65 72  2c 20 74 68 65 20 72 65  | However, the re|
00001e10  73 6f 6c 75 74 69 6f 6e  20 6f 66 0d 6d 6f 64 65  |solution of.mode|
00001e20  20 30 20 67 72 61 70 68  69 63 73 20 77 61 73 20  | 0 graphics was |
00001e30  6e 6f 74 20 72 65 61 6c  6c 79 20 65 6e 6f 75 67  |not really enoug|
00001e40  68 20 74 6f 20 6d 61 6b  65 20 74 68 69 73 20 73  |h to make this s|
00001e50  75 63 63 65 73 73 66 75  6c 2e 0d 20 20 20 20 20  |uccessful..     |
00001e60  20 20 59 6f 75 20 6d 61  79 20 77 69 73 68 20 74  |  You may wish t|
00001e70  6f 20 70 72 6f 64 75 63  65 1a 20 61 6e 1a 20 61  |o produce. an. a|
00001e80  75 74 6f 73 74 65 72 65  6f 67 72 61 6d 1a 20 6f  |utostereogram. o|
00001e90  66 1a 20 61 1a 20 77 6f  72 64 2c 1a 20 6f 72 20  |f. a. word,. or |
00001ea0  73 68 6f 72 74 0d 70 68  72 61 73 65 2e 1a 20 49  |short.phrase.. I|
00001eb0  66 1a 20 73 6f 2c 1a 20  49 20 68 61 76 65 20 73  |f. so,. I have s|
00001ec0  65 6e 74 20 69 6e 20 61  20 20 70 72 6f 67 72 61  |ent in a  progra|
00001ed0  6d 20 74 6f 20 70 72 69  6e 74 1a 20 6c 61 72 67  |m to print. larg|
00001ee0  65 1a 20 74 65 78 74 1a  20 6f 6e 1a 20 74 68 65  |e. text. on. the|
00001ef0  0d 73 63 72 65 65 6e 2e  20 54 68 69 73 20 69 73  |.screen. This is|
00001f00  20 62 61 73 65 64 1a 20  6f 6e 1a 20 74 68 65 1a  | based. on. the.|
00001f10  20 42 61 6e 6e 65 72 20  50 72 69 6e 74 69 6e 67  | Banner Printing|
00001f20  20 70 72 6f 67 72 61 6d  20 66 72 6f 6d 20 45 6c  | program from El|
00001f30  65 63 74 72 6f 6e 20 55  73 65 72 0d 28 4a 75 6e  |ectron User.(Jun|
00001f40  65 20 31 39 38 39 29 2c  20 61 6e 64 20 69 73 20  |e 1989), and is |
00001f50  64 65 73 63 72 69 62 65  64 20 65 6c 73 65 77 68  |described elsewh|
00001f60  65 72 65 20 6f 6e 20 74  68 65 20 64 69 73 63 2e  |ere on the disc.|
00001f70  0d 20 20 20 20 20 20 20  49 66 20 79 6f 75 20 70  |.       If you p|
00001f80  72 6f 64 75 63 65 20 61  6e 20 69 6d 70 72 65 73  |roduce an impres|
00001f90  73 69 76 65 1a 20 69 6d  61 67 65 2c 20 73 65 6e  |sive. image, sen|
00001fa0  64 20 69 74 20 69 6e 21  20 50 65 72 68 61 70 73  |d it in! Perhaps|
00001fb0  20 74 68 69 73 20 63 6f  75 6c 64 0d 62 65 20 74  | this could.be t|
00001fc0  68 65 20 62 61 73 69 73  20 6f 66 20 61 20 66 75  |he basis of a fu|
00001fd0  74 75 72 65 1a 20 63 6f  6d 70 65 74 69 74 69 6f  |ture. competitio|
00001fe0  6e 2c 1a 20 28 69 2e 65  20 22 57 68 61 74 20 6f  |n,. (i.e "What o|
00001ff0  62 6a 65 63 74 20 69 73  20 73 68 6f 77 6e 20 69  |bject is shown i|
00002000  6e 20 74 68 69 73 0d 61  75 74 6f 73 74 65 72 65  |n this.autostere|
00002010  6f 67 72 61 6d 3f 22 2c  20 77 69 74 68 20 74 68  |ogram?", with th|
00002020  65 20 73 6f 75 72 63 65  20 70 69 63 74 75 72 65  |e source picture|
00002030  20 69 6e 63 6c 75 64 65  64 20 6f 6e 20 74 68 65  | included on the|
00002040  20 66 6f 6c 6c 6f 77 69  6e 67 20 64 69 73 63 29  | following disc)|
00002050  0d 20 20 20 20 20 20 20  49 20 68 61 76 65 20 69  |.       I have i|
00002060  6e 63 6c 75 64 65 64 20  61 6e 20 65 78 61 6d 70  |ncluded an examp|
00002070  6c 65 1a 20 6f 66 1a 20  61 6e 1a 20 61 75 74 6f  |le. of. an. auto|
00002080  73 74 65 72 65 6f 67 72  61 6d 20 6f 6e 20 74 68  |stereogram on th|
00002090  65 20 64 69 73 63 2e 20  54 68 65 0d 73 6f 75 72  |e disc. The.sour|
000020a0  63 65 20 70 69 63 74 75  72 65 20 69 73 20 61 6c  |ce picture is al|
000020b0  73 6f 20 74 68 65 72 65  2c 20 62 75 74 20 79 6f  |so there, but yo|
000020c0  75 20 6d 61 79 20 70 72  65 66 65 72 20 6e 6f 74  |u may prefer not|
000020d0  20 74 6f 20 73 65 65 20  74 68 69 73 20 75 6e 74  | to see this unt|
000020e0  69 6c 20 79 6f 75 0d 68  61 76 65 20 68 61 64 20  |il you.have had |
000020f0  61 20 67 6f 20 61 74 20  73 65 65 69 6e 67 20 74  |a go at seeing t|
00002100  68 65 20 69 6d 61 67 65  2e 20 47 6f 6f 64 20 6c  |he image. Good l|
00002110  75 63 6b 21 0d 20 20 20  20 20 20 20 20 20 20 20  |uck!.           |
00002120  20 20 20 20 20 20 20 20  20 20 20 20 20 20 20 20  |                |
*
00002140  20 20 20 20 20 20 20 20  4d 61 74 74 68 65 77 20  |        Matthew |
00002150  46 6f 72 64 2e 0d                                 |Ford..|
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