Every day, there are hundreds—perhaps even thousands—of advertising messages knocking
on your head trying to gain access to the part of your brain that decides to buy things.
With so much money at stake, it's hardly surprising that advertisers go to such
extraordinary lengths to catch our attention. The only trouble is, our brains habituate:
they quickly get used to seeing the same thing over and over again. So the advertisers have
to keep thinking of new tricks to stay one step ahead. One of their latest ideas is to
print posters, magazines, and book covers with lenticulars—images that seem to change as
you move your head. Let's take a closer look at how they work!
Nothing! Lentils are tiny orange, green, or brown pulses popular with vegetarians and—
no—they have nothing to do with how book covers work. The connection between
"lentil" and "lenticular" is simply a matter of words. Lenticulars are
so-called because they use lenses, which are pieces of plastic or glass that bend (or
"refract") light to make things look bigger or smaller. Lenses got their name
because some of them just happen to look a bit like lentils! You can find more in our main
article on lenses (we even tell you how to make a lens of your own, in about 5 seconds
flat, from a drop of water).
How do you make something like our book cover up above? You take your two different
images and load them into a computer graphics program. The program cuts each image into
dozens of thin strips and weaves them together so the strips from the first image alternate
with the strips from the second. This process is called interlacing. If you look at the
doubled-up image printed this way, it's just a horribly confusing mess, but not for
long! Next, you place a transparent plastic layer on top of the doubled-up image. This is
made of dozens of separate thin, hemi-spherical lenses called lenticles. These refract
(bend) the light passing through them so, whichever side you're looking from, you see
only half the printed strips. Move your head back and forth and the image flips back and
forth too like a kind of "visual see-saw".
For all this to work properly, everything has to be printed with incredible precision.
The lenticles have to be exactly the same size as the printed strips underneath them and
lined up with them exactly. Not only that, the image has to be adjusted and printed so that
it looks exactly right when viewed through a certain piece of
lenticular poster(with a certain
"pitch"—or number of lenticles per inch) at a certain viewing distance.
(That's a fiddly technical process and I won't go into the details here, but you
can find out more in the articles and videos in the further reading section below.)
Nothing says lenticulars have to flip back and forth between just two images: some have
as many as 20 different images or "frames" (as they're sometimes called,
using the language of moviemaking). You could have half a dozen different images designed
to point in slightly different directions, so an advertising poster slowly and subtly
changes its message as you walk past! You can also use lenticulars to create amazing 3D
images similar to holograms.
For a basic flip image that changes as you move your head, you need to arrange the
lenticles so both eyes always see the same image; as you move your head, both eyes then
switch simultaneously to the other image. Adding more images, it's possible to create a
basic illusion of movement (a bit like a flip book) and a zooming effect, so the image
appears to get closer or further away as you move the
flip lenticular
poster back and forth. With a slightly different arrangement of lenticles, arranged
vertically, we can send one image to one eye and the alternate interleaved image to the
other, giving the illusion of a three-dimensional picture.
Lenticular images are the neato transforming pictures that often came on trading cards
in the 1980s and 90s. They were handy for freaking out young children or filing your nails.
Turn them one way and they show one picture. Turn them another and they show another. How?
A trick of the light. And plastics.
Lenticular images are the kind of things they used to give out as free promotional
material. They were best suited to things like trading cards of Transformers, because when
looked at from one position, the card would display an image of the untransformed robot,
while from another angle, it would display the image of whatever it transformed into. (On
the back could be a description of why transformers transformed into cars with passenger
compartments even when there weren't people to be passengers on their world.) The cards
were covered with a piece of ridged plastic.
The images take advantage of light's tendency to bend, and only bend a certain
amount. The ridges of plastic essentially 'block' parts of the image from the
viewer. Light from certain parts of the image is reflected or bent away from the viewer.
Each ridge, across the page, directs certain slices of the image back to the viewer. As the
viewer moves, they are exposed to different parts of the ridges and see different slices of
the page.
The image underneath the ridges is a series of interlaced slices - a little like a
colored bar code. Each slice matches up with a section of ridge, and the slices come
together to make the full image. Early lenticular images generally only had two pictures
and flipped back and forth. More modern ones will be a little more complicated, with many
different images, each corresponding to a different segment on the ridge. Some will even
present a 3D picture, by showing slightly different image slices to each eye. For example
the right eye could see one angle of a face, and the left eye could see another. This is
how the eyes regularly build 3D images in the mind, and so the two images combine into a 3D
picture. All it takes it the right kind of sectioning, and, of course, plastic.
This dialogue by Shakespeare very likely refers to
5D lenticular
pictures — those accordion-pleated creations that show different images when you
look at them from the left or right. In Shakespeare’s time and in the 20th century,
lenticulars were manufactured as amusing distractions. Today, the technique is finding a
home in fine art — including this month at The Art League.
One of the first examples of a
lenticular picture still in existence is the Double Portrait of King Frederik IV and
Queen Louise of Mecklenburg-Güstow of Denmark by Gaspar Antoine de Bois-Clair, signed 1692.
As you can see in the photo, this type of
3D lenticular
picture uses a corrugated structure to achieve the effect. Look at it from the left,
you see the king; from the right, the queen; and if you look at it straight ahead, you get
a mish-mash of both.
Starting in the 1950s, companies like Vari-Vue were able to mass-produce lenticular
images through lenticular printing — a novelty you’re probably familiar with from Cracker
Jack boxes and baseball cards:
These flickering images are the result of the same principle but a different process:
the images are behind a small, ribbed plastic lens that shifts what’s in focus.
Lenticulars as fine art
Artists such as Roy Lichtenstein and especially Yaacov Agam have used lenticular design
in their artwork.
Photographer Sally Canzoneri began creating lenticular prints for a specific exhibit
proposal: it was to be displayed in NoMa, a DC neighborhood that was undergoing a lot of
change. While considering how best to show that change, Canzoneri happened to see this
tutorial on creating lenticular images.
It was a match.
“I’ve found that people get drawn into them in a way they don’t get drawn into my
flat pictures,” Canzoneri said. The way viewers engage with the content “comes — at
least in part — from the fact that the viewing experience is broken up and blended in an
unusual way.”
It can also lead to happy accidents. In the print seen in the video at the top of this
post, women’s marches from 1913 and 2017 intersect. Because of the way the images overlap,
when viewing the black-and-white image, you can see a slight pink glow above the 1913
marchers’ heads.
How it works
Canzoneri’s prints use the old-fashioned accordion style, not the plastic lens. It’s
a more hands-on endeavor, and one that took some experimenting to refine.
It starts, of course, with two images. Using Photoshop, Canzoneri stitches together
strips from each image, for a final product that looks like this when printed:Then, using a
carpenter’s square, she carefully folds it into the accordion shape. After a few tries,
Canzoneri found the right type of paper to use and the correct fold depth (about an inch).
Double Takes
Which brings us to “Double Takes” — Canzoneri’s exhibit of lenticular photographs
on view now at The Art League. You can catch these images through February 4, 2018.
Bring your walking shoes — the better to interact with the artwork. And, Canzoneri
says, she hopes the photos encourage viewers to “go outside and look around with fresh
eyes.”
Have you ever walked past an exhibit graphic that seemed to move? Or maybe the image
suddenly shifted? Your eyes weren’t playing tricks on you … the graphic was playing a
trick on your eyes.
These types of graphics are known as lenticular prints.
What Are Lenticular Prints?
Today’s lenticulars aren’t the moving image stickers you used to get at the doctor’s
office as a kid (or adult—no judgment here). You know the ones: if you swiveled it a bit
it looked like She-Ra was raising her sword, or a transformer was … transforming. Well now
that same concept makes things that do this:One of the advantages of lenticulars is that
visitors can get a nice pop of 3D or animation without needing any additional equipment. As
cool as everyone looks wearing those 3D glasses, it’s a bit of waste to supply those for
one panel. Lenticular prints simulate motion and/or dimension using specially fabricated
two-dimensional prints.
HOW DO THE 2D PRINTS MAKE IT LOOK 3D?
It’s called stereoscopy. It’s a visual effect created by providing slightly offset
views to both of your eyes at the same time. When your brain mushes (technical term) the
two visuals together, you see the combined image with additional depth and volume. In other
words, your brain takes Image 1 and Image 2 and turns into a much more awesome optical
illusion. To do that, the designer has to interlace the images.
One of the advantages of lenticulars is that visitors can get a nice pop of 3D or
animation without needing any additional equipment. As cool as everyone looks wearing those
3D glasses, it’s a bit of waste to supply those for one panel. Lenticular prints simulate
motion and/or dimension using specially fabricated two-dimensional prints.
HOW DO THE 2D PRINTS MAKE IT LOOK 3D?
It’s called stereoscopy. It’s a visual effect created by providing slightly offset
views to both of your eyes at the same time. When your brain mushes (technical term) the
two visuals together, you see the combined image with additional depth and volume. In other
words, your brain takes Image 1 and Image 2 and turns into a much more awesome optical
illusion. To do that, the designer has to interlace the images.
Other than they’re really fun? Lenticular prints add impact to displays of static
photographs and other images. They can also create a depth of content. By layering images
on top of each other, a lenticular can show a before and after, or a variety of images on a
theme in a way that shows shifts. Recently, Smithsonian Libraries worked with SIE to create
lenticular prints for their exhibition Magnificent Obsessions: Why We Collect. Visitors
could see the image of a prized possession, and then it would shift, showing the collector.
Visitors can see a visual connection between the two images, and figure out that the
stories behind those two images are intertwined.
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