Illuminating photography: From camera obscura to camera phone - Eva Timothy

475,964 views ・ 2013-02-28

TED-Ed


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Transcriber: Andrea McDonough Reviewer: Bedirhan Cinar
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Let me guess,
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you've got Facebook albums full of photos.
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You have photos on your computer desktop,
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on your mobile phone,
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on your bedroom wall.
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You see photos in magazines and newspapers,
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on the side of buses,
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and of course, in your family albums.
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We take photos for granted in a major way.
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But, creating a picture
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that looked exactly like the person or thing
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that you were photographing wasn't always obvious.
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In fact, in the past, it was a big mystery.
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How could you, in essence,
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take your reflection in the mirror
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and freeze it in there?
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In the 9th century,
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the Arab scientist Alhazen
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had come up with the idea
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of using the camera obscura,
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which was literally a dark room, or box,
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with a single, small hole in one side that let light through.
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This would project the image outside into the wall inside.
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During the Renaissance,
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artists like Leonardo DaVinci used this method
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to introduce 3-D scenes onto a flat plane
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so that they could copy things,
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like perspective, more easily.
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In 1724, Johann Heinrich Schultz discovered
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that exposing certain silver compounds to light
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altered their appearance
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and left marks wherever the light touched.
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Essentially, Schultz found a way to record the images
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that Alhazen was able to project,
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but only for a little while.
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Schultz's images disappeared soon after he had made them.
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It wasn't until 1839 that people figured out
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how to project images onto light-sensitive surfaces
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that would retain the image after exposure,
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and thus, photography was born.
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At that point, it was mostly two inventors
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who fought for the best way to make photos.
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One was British scientist Henry Fox Talbot,
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whose calotype process used paper
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and allowed many copies to be made
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from a single negative.
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The other inventor, Louis Daguerre,
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was an artist and chemist in France.
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He developed something called a daguerreotype,
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which used a silvered plate
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and which produced a sharper image.
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But the daguerreotype could only make positive images
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so copies had to be made by taking another photo.
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In the end, the daguerreotype won out
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as the first commercially successful photographic process
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mostly because the government made it freely available to the public.
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So now that photography was available,
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getting a picture of yourself would be a snap, right?
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Well, not exactly!
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This process still required a whole dark room
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at the location of the photograph,
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which was a big hassle.
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Picture the early photographers lugging
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enormous trailers with all their equipment
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wherever they wanted to take a picture.
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Not only that, but the early processes
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had extremely long exposure times.
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To get a good photo, you would have to stand perfectly still
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for up to two minutes!
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This led to development of inventions like
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the head holder,
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a wire frame that would hide behind you
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while supporting your head.
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It's also why you don't see people smiling
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in early photographs.
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It's not that life was that bad,
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it was just hard to keep a steady grin
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for more than a few seconds,
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so people opted for a straight-faced look.
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And then George Eastman came along.
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Eastman believed that everyone
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should have access to photography,
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and he spent many late nights
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mixing chemicals in his mother's kitchen
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to try to achieve a dry plate photographic process.
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This would allow exposed negatives
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to be stored and developed later
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at a more convenient place
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instead of carting those dark rooms,
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necessary for wet plates, around.
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After starting a business,
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which initially made dry plates,
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Eastman eventually discovered plastic roll film
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that would fit in hand-held, inexpensive cameras.
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These cameras sold by the millions under the tag line,
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"You push the button,
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we do the rest."
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While Eastman was largely responsible
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for making photography a universal pastime,
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even he could not have dreamed of the ways
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photography had since shaped the world.
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It's now estimated that over 380 billion photographs
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are taken each year.
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That's more photographs each day
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than were taken in the first hundred years
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after photography was invented.
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Say cheese!
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