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I've acquired a new superpower

danielwirtz.com

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Re: I've acquired a new superpower

#191

Post by naet »

the__alchemist wrote: post #33

If you've done Magic Eyes, this is straightforward. Was able to get all 3 of the test images quickly. This is with focusing beyond the screen. Focusing in front of the screen is something I am unable to do, and not for want of effort. Also, your eyes might accidentally do this if looking at tiled patterns, e.g. wallpaper. Relative image size (e.g. view distance) is important.

I'm great at magic eyes / stereograms and have a ton of posters around my house with them, but I still had trouble with seeing the differences in the test images. I easily locked in my focus on the overlapping cat images but only one difference stood out to me. I eventually got them all but it wasn't that easy (maybe with practice I could get there). The differences are noticeable when I focus right on it, but when I'm looking at the whole image it's harder to tell what is missing from one eye.

Re: I've acquired a new superpower

#192

Post by kayge »

soperj wrote: post #162

Any recommendations for when you can't get the images to quite overlap? I feel like I can get 75% of the way there, but then they start going the other direction. I can do magic eye easily.

Use your browser to zoom out and make the images slightly smaller

Re: I've acquired a new superpower

#193

Post by thfuran »

seeekr wrote: post #120
phailhaus wrote: post #26

Earlier quoted context omitted.

For spot-the-difference, crossing your eyes is more effective and easier to "dial in" than uncrossing them. You're essentially making each eye look at the opposite image. If you try uncrossing, then you need to make sure the images are at the exact correct distance to cause them to overlap with that technique, because you can only uncross your eyes enough to look straight ahead.

Is that true? It seems that our eyes are mechanically capable of looking in divergent directions, what's the reason that we're not able to "uncross" them beyond looking straight ahead? (Edit: Anecdotally I can confirm for myself that I'm not able to do it, so wondering if there's anyone that can.)

From a control system standpoint, if you have one control that rotates both eyes the same number of degrees left or right to determine gaze direction and another to rotate both eyes the same (positive) number of degrees inward to control fixation distance, you can't specify the left eye rotated left of center and the right eye right, even if each eye physically can rotate that way. Not sure if that's how eyes actually work though.

Re: I've acquired a new superpower

#196

Post by mNovak »

SoftTalker wrote: post #69
the__alchemist wrote: post #33

If you've done Magic Eyes, this is straightforward. Was able to get all 3 of the test images quickly. This is with focusing beyond the screen. Focusing in front of the screen is something I am unable to do, and not for want of effort. Also, your eyes might accidentally do this if looking at tiled patterns, e.g. wallpaper. Relative image size (e.g. view distance) is important.

I can get the images to merge but the differences don't stand out.

I find there's a two step process, first overlapping the images (but which makes the images blurry), then letting my eyes refocus so the middle image is crisp. Only then does 3D or shimmer effect happen. Takes some practice to merge the images while maintaining focus for me.

Re: I've acquired a new superpower

#197

Post by lxe »

Workaccount2 wrote: post #43

At a local bar they had a game machine, and if you got a high score on any of the games, your tab for the evening was free. One of the games was a "spot the differences" between two pictures with an ever decreasing timer for each round. Using this trick I was able to easily surpass the high score, and garner a crowd watching me perform this mind numbing feat. Probably my peak fame right there.

I was about to post this same exact post :)

Was the high score holder on there for a few years.

Re: I've acquired a new superpower

#198

Post by manbash »

naet wrote: post #191
the__alchemist wrote: post #33

If you've done Magic Eyes, this is straightforward. Was able to get all 3 of the test images quickly. This is with focusing beyond the screen. Focusing in front of the screen is something I am unable to do, and not for want of effort. Also, your eyes might accidentally do this if looking at tiled patterns, e.g. wallpaper. Relative image size (e.g. view distance) is important.

I'm great at magic eyes / stereograms and have a ton of posters around my house with them, but I still had trouble with seeing the differences in the test images. I easily locked in my focus on the overlapping cat images but only one difference stood out to me. I eventually got them all but it wasn't that easy (maybe with practice I could get there). The differences are noticeable when I focus right on it, but when I…

Are you able to look around while keeping your "unified vision"?

To me, all the differences appeared to be flashing (probably my brain alternates between the pair of images it attempts to "lock in", or something to that effect).

Re: I've acquired a new superpower

#200

Post by NortySpock »

nayuki wrote: post #68

I discovered this trick independently about a decade ago, to use cross-eyed viewing to easily spot differences between two similar images. Like you said, the parts that mismatch appear to shimmer and be unstable, making them obvious. However, I feel eye strain from doing it, so I prefer other methods. 99% of the time, I do https://en.wikipedia.org/wiki/Blink_comparator instead, just switching between two images with…

I'll second the blink comparator method as a simple diff checker, or when comparing two chunks of code that are structured exactly the same way but somehow behave differently. (e.g. "what's the difference between these two functions" or "how is this yaml block different from that yaml block"?)

Line them up as two tabs in the editor, flip very rapidly between the two repeatedly, and usually the difference is apparent in 5-6 flips.

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