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YouTube / Brusspup

Visual Trickery: Loopy Water, Unmoving Hose

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YouTube / Brusspup

This is nuts. In the two-minute video below, YouTube user Brusspup shows us how a carefully tuned speaker, a tube spitting water, and a camera can create an impressive optical illusion -- the illusion that water flows out of a seemingly unmoving tube in 3D spiral shapes.

So how does this work? It's actually pretty simple to set up: the speaker plays a 24 Hz tone (a very low note), which means 24 cycles of the speaker cone per second. A hose carrying water is attached to the front of the speaker, so it moves in time with the tone (thus, it is waving back and forth 24 times a second). This movement causes the hose to spray water back and forth. Finally, a camera running at 24 fps (frames per second) is pointed at the hose's output. The result is what you see below -- when we synchronize the camera's snapshots of reality and the speaker's movement, we see what looks like an unmoving hose -- the camera happens to snap a frame at moments when the tube is in the same place, so its wild movement is hidden. (Then Brusspup shows us the effects of tuning the speaker at slightly different frequencies -- trippy stuff, and you can now see the tube moving.)

What we're really seeing is a series of snapshots of water that happens to look really neat; the naked eye doesn't see this effect because the eye isn't a video camera (it is not limited to a "24 frames per second" view of the world). This effect is related to the reason that car wheels sometimes "go in reverse" when seen on TV or film: because the frame rate of any camera is limited, the motion of an object being filmed can interact with the camera in interesting ways.

With all that mumbo-jumbo out of the way, just look at this:

If you like that, you'll probably dig Strobe Lights & Water Drops, including a "Time Foundation" -- a technique using a strobe light to make water drops appear to "freeze" in mid-air.

(Via Colossal.)

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Matt Cardy/Getty Images
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Check Out These Images of Last Night's Spectacular Harvest Moon
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Matt Cardy/Getty Images

Each year, a special moon comes calling around the autumnal equinox: the Harvest Moon. The Harvest Moon—the full moon that falls nearest to the equinox—rises near sunset for several days in a row, making early evenings extra-bright for a few days when farmers traditionally reveled in the extra-long twilight while harvesting their crops at the end of the summer season. And because the moon looks larger and more orange when it's near the horizon, it's particularly spectacular as it rises.

The Harvest Moon
Matt Cardy/Getty Images

October 5 marked 2017’s Harvest Moon, and you may have noticed an extra spectacular sky if you were looking up last night. It's rare for the Harvest Moon to come so late in the year: The last time it came in October was in 2009. (Last year's fell on September 16, 2016.) Here are a few luminous lunar pictures from the event, some of which make the moon look totally unreal:

And if you missed seeing the event yourself, don't worry too much: the moon will still look full for several days.

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Adobe
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With Help From Photoshop and AI, No One Will Know You Blinked in That Photo
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Adobe

After 15 minutes of posing for group photo after group photo, it looks like you’ve finally snapped the perfect one. Grandma is smiling, your nephew is sitting still, and even the dog is looking at the camera for once. Then, you find yourself in the corner: The shutter managed to capture the exact moment you blinked. Time to resume the positions.

With a new tool from Adobe, this scenario could become less common. Instead of retaking a picture every time someone closes their eyes, this feature would let you salvage the “ruined” photograph with a few clicks in Photoshop, Gizmodo reports.

The latest update of Photoshop Elements allows users to select the “Open Closed Eyes” option, choose which face in the photo they want to correct, and provide several additional photos of the subject with their eyes open. The software uses artificial intelligence to analyze each picture and determine which pair of peepers best matches the colors and lighting from the primary photograph. It then automatically pastes those eyes over the lids and blends them to make the addition look seamless.

Photoshop Elements (a simplified version of Adobe’s original image editor) offers many features that use AI algorithms to improve picture quality. Elements can automatically generate backgrounds when you move objects in a photo, suggest the best effects, and turn frowns into smiles. It even remembers the look you prefer and suggests personalized tone corrections. All of those capabilities and the new “Open Closed Eyes” tool are available today to customers who purchase Photoshop Elements 2018 for $100 (or upgrade their existing license for $80).

[h/t Gizmodo]

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