Hi, this is Wayne again with a topic “History of the Pixel as Fast As Possible”.
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 daguerreotype and it involves all of this stuff, but photography only continued to improve from there and soon the daguerreotype 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 check 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 Logie Baird demonstrated the first televised moving images using a mechanical television set that used a rapidly rotating nib qov scanning disk. It was grayscale and limited to 12.5 frames, a second and just thirty 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, filo 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 phosphoric covers screen at the their 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 phosphorus called triads. These triads are still not quite pixels. The color TV standard at the time was five hundred and twelve 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 a variety of screens like plasma. Oh le d, — 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.
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