
The slit-scan effect is a cool technique in photography and video where a slide with a slit is moved across the imaging device. Basically, you can do weird effects that treats each row of the image in an independent manner. For example, in the image of a hammer thrower above, the slit was moved across the film instead of a shutter, and produces an image whose rows slice the thrower at different points in time. It’s a startling effect.
In the video below, the same effect is used in video. A woman turns around in place, but, instead of seeing it all happen at once, we see her body impossibly contort as the slit scan is performed. In this case, it’s a digital version called the “time displacement” effect.
And of course, this effect has been used in various other media, like this music video from the Belgian band Goose below (effect start at 1:53). Also, they have a giant version of the rotating window optical illusion. Fun stuff.




