WEBVTT

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the word pixel comes from the words picture element and today's video is all

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about the history of the pixel it begins

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all the way back in 1839 when the first practical

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commercially available process of Photography was introduced it was called

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the dogar type and it involves all of this stuff but photography only

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continued to improve from there and soon the dogar type was obsolete photography

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was pretty much black and white until the first permanent color photograph was

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taken in 1861 by a man named James Clerk Maxwell

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what he did was capture three black and white images each through a different

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filter red blue and green by projecting

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each of these images back through their respective colored filters and onto a

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screen the final colored image was able to be reconstructed and here it is it's

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a Tartan ribbon Tartan is also what spell Che always tries to change my name

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to anyway this process of capturing just the primary colors of red green and blue

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light works so well that we still use it to this day because red green and blue

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are primary additive colors you can mix them together in different proportions

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to achieve any color you like continuing along the timeline in 1926 a man named

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John loie bear demonstrated the first televised moving images using a

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mechanical television set that used a rapidly rotating npov scanning disc it

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was grayscale and limited to 12.5 frames

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a second and just 30 lines of resolution but it was very impressive for the time

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notice how we're measuring the resolution in lines not pixels pixels

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hadn't been invented yet but we're getting closer later in 1927 filot T

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Farnsworth demonstrated the completely electronic cathode ray tube television

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set the CRT was definitely superior to the mechanical television sets

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especially since it had no moving parts here's how it works you've got a sealed

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glass tube with a vacuum inside at one

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end you've got an electron gun which is exactly what it sounds like this gun

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shoots out a varied stream of electrons which are then steered by the magnets

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such that they land upon the phosphor covered screen at the other end of the

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tube forming a picture and it's done so quickly that you can't even see it

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happening color television was first introduced in the

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1950s and they worked in a very similar

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way instead of just one electron gun now you had three one for each of the

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primary colors of red green and blue the beams would hit an array of colored

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phosphors called Triads these Triads are

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still not quite pixels the color TV standard at the time was 512 distinct

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horizontal lines it wasn't until the digital age that those video lines were

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further sliced into rectangles which made digital representation of an image

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possible and thus the pixel was finally born today pixels come in a variety of

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shapes and sizes on on a variety of screens like plasma OLED and LCD

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displays which have rendered CRTs mostly obsolete pixels have continued to get

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smaller and smaller with better frame rates and better color depth we've

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already made videos about all these topics which you can check out right

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over here if you want to watch even more highquality educational content then

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for watching this episode a fast as possible give us a like or a dislike

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next time