[HN Gopher] How to Make Your Own Spooky Magic Eye Pictures (Auto...
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How to Make Your Own Spooky Magic Eye Pictures (Autostereograms)
Author : jstanley
Score : 132 points
Date : 2023-10-22 18:43 UTC (14 hours ago)
(HTM) web link (blog.demofox.org)
(TXT) w3m dump (blog.demofox.org)
| PaulHoule wrote:
| Nice, but I still like making red-cyan anaglyphs
|
| https://en.wikipedia.org/wiki/Anaglyph_3D
|
| though I think the premium way to enjoy stereograms in 2023 will
| be with a VR headset (no fan of Facebook but I just got a Quest 3
| and wow!)
| cubefox wrote:
| Unfortunately they are hardly making stereoscopic movies
| anymore. Maybe they come back with VR though (doubt it).
| eru wrote:
| Well, there's always porn. They are always on the forefront
| of technology.
| ksaj wrote:
| This was interesting.
|
| Stereo wideners (a switch made to cause music to sound wider in
| audio 3D space) work very similar to the Dolby3D, except with
| equalization instead of colour filtering.
|
| Dolby3d takes chunks of red, green and blue, and filters them so
| the left and right eye are seeing slightly different reds, greens
| and blues in a way that isn't easily detected by the person
| viewing them. Both eyes see apparently normal views, but together
| they see a stereo image.
|
| Stereo audio wideners take a set of audio frequencies, lowering
| their EQ on one side while raising them an equivalent amount on
| the other, so that the left and right ears are hearing different
| equalization that still sound reasonably normal.
|
| It makes sense that Dolby is the primary name associated to both
| technologies. They are pretty much the same left-right reversed
| comb filters, except light frequencies versus sound frequencies.
| ZeroGravitas wrote:
| > Lastly, I think it would be really neat to make a game that
| used this technique to render 3d.
|
| See the 1994 game "Magic Carpet" for this and some other weird
| 3D-modes including an early VR helmet.
|
| edit: the only brief clip I can find online that actually lets
| you experience the effect:
|
| https://youtu.be/3qiIXbfQjA0?si=NLKv8Bs3EyW-lZX4&t=62
|
| but I did find a modern platformer:
|
| https://managore.itch.io/stereogram
| ciroduran wrote:
| I once a game designer why they implemented autostereograms on
| Magic Carpet and turns out it was the whim of a programmer :)
| https://twitter.com/BulkPaint/status/1617192325091819520
| dwighttk wrote:
| I can only really see these things crossed instead of parallel...
| makes all of these push into the screen instead of jump out.
| ozten wrote:
| One of my favorite types of Autostereogram is the Object Array
| Stereogram, because they are well rendered as 2D images, but when
| you switch to the correct focal distance, you get an amazing 3D
| experience.
|
| They have the built in constraint that you need to have rows if
| identical objects, but that works quite well for chess pieces in
| this example.
|
| https://en.m.wikipedia.org/wiki/File:Chess_Single_Image_Ster...
| docandrew wrote:
| I had a (really creative) buddy growing up who figured out that
| you could do the wallpaper function in Mario Paint (which
| filled the canvas with repeating icons) and then stamp over
| some of the icons but slightly offset, and when you crossed
| your eyes funny they'd pop out of the screen. Very easy DIY
| Magic Eye.
| marcodiego wrote:
| The images he chose have too much fine detail. That makes it very
| hard to identify what they are even when you "get" the effect.
| anonymous_sorry wrote:
| I always find this to be common problem with magic eye
| pictures. The 3D effect is interesting to experience, but the
| pattern is so busy and distracting that it's often hard to tell
| what the object is supposed to be anyway.
|
| As a kid I had a book which had tried to address this problem.
| The shape was still hidden but certain elements of the
| repeating pattern coincided with and emphasized parts of the
| hidden image - but in a way that wasn't obvious until you had
| revealed the 3D effect. It was partially successful.
| coxmi wrote:
| Can anyone else not see the image? I can unfocus my eyes a
| little, but what I think is mostly happening is that I'm just
| slightly crossing my eyes so it doesn't work.
|
| Is it better on a non-phone screen?
| smeej wrote:
| Crossing the eyes tends to show just the outline of the shape
| instead of a 3D image.
|
| The phone screen works fine for me, but a larger screen might
| work better for you. It's more like a "zoning out" unfocusing
| than a crossing of the eyes, like you're trying to look at a
| point slightly behind your screen.
| ghosty141 wrote:
| Yes, a bigger screen helps a lot. There are a bunch of
| tutorials how to get it to work on youtube etc.
| somat wrote:
| Does the effect work with an animated depth image?
|
| I always have a hard time with these. I get the 3d effect but can
| never figure out the image. I suspect based on reading some
| theory that I am viewing them cross eyed instead of slack eyed.
| But have no idea how to do it the other way around.
|
| Update: it does, I found a youtube video, still cant resolve it
| however. https://www.youtube.com/watch?v=IZpsbQMQFBs
| ghosty141 wrote:
| Thanks for sharing that video, worked perfectly for me.
| Although watching videos with this effect is kinda headache
| inducing after a while, at lesst for me.
| hubblesticks wrote:
| I have always crossed my eyes since the days of Magic Eye
| books, and could reliably "see" the image but it was always
| reversed (seemingly going INTO the page). It wasn't until this
| article that I realized I could go "slack eyed" as you call it.
| Now the images pop OUT of the page instead of recede into it. I
| wish I could rewind 30 years and tell my younger self how to do
| it.... I would have enjoyed those books so much more.
| JKCalhoun wrote:
| I flip the lid mostly closed on my MacBook and stare off at
| something across the room past the laptop. While still
| staring at that thing across the room I bring the display lid
| up in front of my gaze.
| JKCalhoun wrote:
| This is a good one -- probably came up on an earlier HN post:
|
| https://youtu.be/2AKtp3XHn38?si=GDHjv1VyxCvMAzQU
| eru wrote:
| The video just animates the surface picture, and swaps between
| different depth maps. But otherwise the depth maps are not
| animated, alas.
|
| This one https://managore.itch.io/stereogram (link from another
| comment) actually animates both.
| jodrellblank wrote:
| Linked video - these are some of the coolest I've seen in a
| long time: https://www.youtube.com/watch?v=NmRfVoiFDu4
|
| The almost holographic looking sphere and pyramid at 00:15
| seconds.
|
| The nested petal thing at 45 seconds.
|
| The Yin-Yang at 01:22
|
| Here's soem cross-eye autostereo drone videos:
| https://www.youtube.com/watch?v=QzyjLtzPDNw
| netruk44 wrote:
| The fact that all you need is a depth map of what you'd like to
| create makes me wonder if anyone's ever linked something like
| this up to a video game engine to make possibly the least
| visually pleasing and least accessible game out there.
| ClassyJacket wrote:
| Yep, ZeroGravitas mentioned Magic Eye in another comment, also
| this:
|
| https://www.rockpapershotgun.com/cross-your-magic-eyes-to-pl...
| Tao3300 wrote:
| Call it _Polybius_.
| pfedak wrote:
| https://managore.itch.io/stereogram is an impressive example of
| the possibilities here, with an animated noise image and
| interactive depth map.
| a1o wrote:
| I find these much easier to work on my eyes than the one posted
| on the article above, probably because the side by side pattern
| is easier to cross-focus.
| adventurer wrote:
| I can never see it for some reason. I assure you I just saw the
| eye doctor and my eyes were also fine 20 years ago when these
| were popular.
| maxerickson wrote:
| I have ~-1.75 in one eye and -3.5 in the other and it took me a
| long time to eventually be able to resolve the hidden images.
| They usually aren't all that satisfying really.
| Tao3300 wrote:
| They were always a lot easier to see framed so you could trick
| your focus by looking at reflections in the glass. Ideal
| conditions: printed at poster size, at a shopping mall kiosk,
| near a trashcan with an ashtray.
| Jare wrote:
| The blue noise example is crazy. It's always been trivial to me
| to cross-eye into MagicEyes, I can even comfortably scroll the
| page and never lose the 3D. I had no idea there were (if I
| understood correctly) adversarial background patterns.
| dwringer wrote:
| Interestingly, perhaps, I found that one to be easier to make
| out the fine detail than any other magic eye that I've seen
| before. However I did find it a bit more eyestrain inducing as
| well. This is a great blog and makes me want to experiment
| more.
| g-b-r wrote:
| You mean that you _do_ see the 3d effect in the blue noise
| image???
| spandextwins wrote:
| 1990s were fun times!
| jrapdx3 wrote:
| 3D images have captivated me since I was a kid. A frequent source
| of amusement was the "Victorian wallpaper effect" and even
| without a viewer I could easily see classic stereo photo pairs in
| 3D. Not at all difficult to see the "hidden" objects in the
| article's quite nice illustrations.
|
| While popularity of SIS imagery isn't what it was a few decades
| ago, programmer interest in the subject has remained quite
| strong.
|
| As an artist I enjoy incorporating SIS images in my work. In the
| past I've used a number of open-source SIS generators. Mostly
| these programs weren't completely satisfactory. A common defect
| was producing SIS artifacts marring output image appearance.
|
| Subsequently I wrote a SIS program (with GUI for usability) [0]
| that almost entirely eliminated artifacts in the finished images.
| Developed with artists' interests in mind, its SIS output looks
| different vs. examples in the article. (Using depthmap and
| texture/pattern image inputs, the latter determines the "surface"
| appearance of the SIS.) However both SIS styles have the same 3D
| effect capability.
|
| [0] https://thinairarts.com/stereogram.html
| andai wrote:
| This looks great. You should add some more output images!
| carapace wrote:
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| !! !::::'___`:::::::'___`:::::::'___`:::::::'___`:::::::'
| ___`:::::::'___`::::! !:::'/_ _\`:::::'/_ _\`:::::'/_
| _\`:::::'/_ _\`:::::'/_ _\`:::::'/_ _\`:::! !:::|/ ~
| \|`::::|/ ~ \| `::|/ ~ \|' `|/ ~ \|::' |/ ~ \|::::'|/ ~
| \|:::! !:::|'-.-`| :::|'-.-`| :|'-.-`| |'-.-`|:
| |'-.-`|::: |'-.-`|:::! !:: (|e|e|? ::(|e|e|? '
| (|e|e|? ` ' (|e|e|? ` (|e|e|?.: (|e|e|? ::! !.
| `._^_,'' :`._^_,'..' `._^_,'`...'`._^_,' `..`._^_,'.
| ``._^_,' .! !. \\=// \\=// \\=//
| \\=// \\=// \\=// .! : U/_/ U/_/
| U/_/ U/_/ U/_/ U/_/ : @/
| \&~ @/ \&~ @/ \&~ @/ \&~ @/ \&~ @/
| \& Y/\.::./\S\ /Y/\.::./\S\ /Y/\.::./\S\ /Y/\.::./\S\
| /Y/\.::./\S\ /Y/\.::./\S E$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
| $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$E %%%%XX%%%%%%%
| %%%%XX%%%%%%%%%%%XX%%%%%%%%%%%XX%%%%%%%%%%%XX%%%%%%%%%%%XX%WiZ
|
| https://www.subgenius.com/bigfist/eyes/Jittlov3-D-Dobbs.html
| Tao3300 wrote:
| The haunted house one faked me out. I thought I was looking at
| https://davematthewsband.com/music/remember-two-things-reiss...
| stuckkeys wrote:
| First I thought...crap I need to go see an eye doctor, then
| booom. The depth kicked in. My eyes got stuck lol. Trippy. Live
| the effect.
| grishka wrote:
| These things never worked for me. Maybe I don't understand how to
| look at them correctly to get whatever 3D effect they're supposed
| to make, but for the life of me, I could never see anything at
| all in those patterns, neither on screen nor when printed.
|
| edit: I found this video[1] with pairs of images that tells you
| to hold sunglasses in front of your right eye if you can't
| defocus your vision correctly. _This_ worked for me with an ND
| filter, it really feels like it shouldn 't do anything but I did
| see depth. Those patterns though, still no idea how to make them
| work.
|
| [1] https://www.youtube.com/watch?v=mLsODo7ycaA
| stiray wrote:
| Actually I can also see this one, maybe becoase of the 3d cube
| at the beginning that exactly shows you what to do.
|
| Now I will probably see everything blurred for rest of the day.
| artdigital wrote:
| Same for me, I can't see anything in those images. I have
| astigmatism and red/green colorblindness though (which I
| discovered later in life). Could be related?
| g-b-r wrote:
| I have astigmatism as well and it initially took me a very
| long time to manage to see them, it might be that it has an
| effect (I practiced enough that I then learned to see them at
| a blink of an eye, and it helped my normal vision a lot btw)
| grishka wrote:
| I used to have really bad myopia, but right now, many years
| after laser surgery, I still have nearly perfect vision. I
| feel like my main problem is that I can't overcome my
| reflexes.
| rob74 wrote:
| TBF, these "hidden" autostereograms are the most challenging to
| "see" - it's probably better to start off with two "actual"
| pictures printed or displayed side by side (because there you
| have some cues to how far you are from the images overlapping),
| and then try to apply the same technique to autostereograms? I
| can manage to do it most of the time, but it always takes some
| effort. I think it also helps if the image is bigger, but
| YMMV...
| mountain_peak wrote:
| When my kids were younger, they used to subscribe to a children's
| magazine that featured a monthly "spot the difference" puzzle.
| They were amazed when I used to glance at the image and rattle
| off the one obscure difference they missed.
|
| My trick was based on "magic eye" images I used to enjoy. When I
| saw the side-by-side drawings used by the puzzle, I wondered what
| would happen if I "fuzzed" my eyes as if I was looking at a magic
| eye photo. To my surprise, all of the items that were different
| between the two images "vibrated" or "shimmered", while the rest
| of image stayed steady. I repeatedly fuzzed and focused to spot
| all the differences in a matter of seconds.
| satvikpendem wrote:
| Yep, I do this too. One thing that's cool is viewing
| stereograms that have differing colors. Some people apparently
| can see new colors via this method that is not simply a mix of
| the two colors.
| antiterra wrote:
| If this made anyone else curious, I found
| https://m.youtube.com/watch?v=cQCsDfEqr9o from a post with a
| 'blellow' stereogram
| https://www.reddit.com/r/MagicEye/s/pd2FtY5PnY
|
| There's some skeptical commentary in the thread as wel.
| Dwedit wrote:
| I use this for diffing on a PC, such as when you have a hex
| editor open that doesn't have a built in diffing feature.
| jstanley wrote:
| I find a good technique is to load hex dumps in vimdiff.
| zzzeek wrote:
| I can only see these dumb things in reverse (the shape is always
| sinking into the page, rather than popping out). isn't there a
| way to generate these inverted so weirdos like me can finally
| enjoy them ?
| g-b-r wrote:
| You're crossing your eyes instead of distancing them, that's a
| lot easier for me as well but you should manage to see these
| kind if stereograms too with some practice.
|
| Simply letting your sight defocus as when you're looking into
| the void thinking something will probably get you closer; then
| keep in mind that to see these images you need to make a much
| more subtle correction than when doing the cross-eyes thing,
| such that it's actually easy to "bind" to pairs of patterns
| farther apart than what's needed.
|
| The rest is just like with cross-eyes stereograms, check the
| borders of the double-image to verify the alignment of your
| head, and as you get closer to joining the dots strive to get
| the image back in focus (but of course without moving the
| eyes).
| quickthrower2 wrote:
| Wow, now that I need reading glasses these are easier than when I
| was a kid
| pbj1968 wrote:
| Hyper Color tshirts reminded us we all had nipples and sweaty
| armpits.
| gaoryrt wrote:
| My eyes have never been so itchy, thank you.
| stiray wrote:
| for those who can master it, here is Tetris to play:
| https://www.deviantart.com/3dimka/art/3D-Stereogram-Tetris-3...
|
| I was never able to see stereograms, the most I was able to pull
| out was to see it inverted (x seeing with eyes, while the
| opposite is required).
| g-b-r wrote:
| I'm not an expert but I don't think you need to go to a doctor if
| you can't see them easily, I think it's common for it to take a
| lot of effort initially
|
| It actually might well be that people with sight problems will
| have a harder, or a lot harder, time at first, but, yeah, with
| enough time most will probably manage to.
|
| I think it took me weeks to start to see them easily, and
| probably at least days to see one for the first time.
|
| By the way, from then on though, I became able to e.g. watch
| stereo videos stereographically in a split second, from any
| position (so long as I kept exercising every once in a while); so
| it's probably just a matter to learn how it works and maybe
| exercise the eyes a little, for most people.
| Dwedit wrote:
| Fractint was an excellent program for making Stereograms, and I
| believe it can still be used for that task.
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(page generated 2023-10-23 09:00 UTC)