the word pixel comes from the words picture element and today's video is all
about the history of the pixel it begins
all the way back in 1839 when the first practical
commercially available process of Photography was introduced it was called
the dogar type and it involves all of this stuff but photography only
continued to improve from there and soon the dogar type was obsolete photography
was pretty much black and white until the first permanent color photograph was
taken in 1861 by a man named James Clerk Maxwell
what he did was capture three black and white images each through a different
filter red blue and green by projecting
each of these images back through their respective colored filters and onto a
screen the final colored image was able to be reconstructed and here it is it's
a Tartan ribbon Tartan is also what spell Che always tries to change my name
to anyway this process of capturing just the primary colors of red green and blue
light works so well that we still use it to this day because red green and blue
are primary additive colors you can mix them together in different proportions
to achieve any color you like continuing along the timeline in 1926 a man named
John loie bear demonstrated the first televised moving images using a
mechanical television set that used a rapidly rotating npov scanning disc it
was grayscale and limited to 12.5 frames
a second and just 30 lines of resolution but it was very impressive for the time
notice how we're measuring the resolution in lines not pixels pixels
hadn't been invented yet but we're getting closer later in 1927 filot T
Farnsworth demonstrated the completely electronic cathode ray tube television
set the CRT was definitely superior to the mechanical television sets
especially since it had no moving parts here's how it works you've got a sealed
glass tube with a vacuum inside at one
end you've got an electron gun which is exactly what it sounds like this gun
shoots out a varied stream of electrons which are then steered by the magnets
such that they land upon the phosphor covered screen at the other end of the
tube forming a picture and it's done so quickly that you can't even see it
happening color television was first introduced in the
1950s and they worked in a very similar
way instead of just one electron gun now you had three one for each of the
primary colors of red green and blue the beams would hit an array of colored
phosphors called Triads these Triads are
still not quite pixels the color TV standard at the time was 512 distinct
horizontal lines it wasn't until the digital age that those video lines were
further sliced into rectangles which made digital representation of an image
possible and thus the pixel was finally born today pixels come in a variety of
shapes and sizes on on a variety of screens like plasma OLED and LCD
displays which have rendered CRTs mostly obsolete pixels have continued to get
smaller and smaller with better frame rates and better color depth we've
already made videos about all these topics which you can check out right
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