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- papikteberszotil
- Nov 19, 2021
- 2 min read
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For a long time, I didn't understand why a movie has a VHS quality in terms of the resolution. However, it's not hard to figure out when you think about it in these terms. Imagine that you have a bookshelf that is four deep with books on it and all the lines in between them are drawn as thin as they can be drawn. On each shelf, there is one book's worth of vertical height from the top to bottom of the shelf. If three shelves are drawn together at their top lines, then when stacked on top of one another they would create an L-shaped bookcase with three times the height from the top line to bottom line. That means the bottom line of the shelf is three times higher than the top line. Now, imagine that horizontally around each shelf are drawn lots of other vertical lines to make up lots of other shelves. If you make a movie at 640 x 480 pixels, you are drawing books on each shelf with approximately 1 pixel worth of vertical height between them. Each book is using up one pixel at its top and the whole row it's in uses another pixel. There are about 640 horizontal lines across each book or set of books. So there are at least 640 x 480 = 307,200 pixels used for this imaginary "bookcase. The total amount of pixels used in the movie would equal 1/2 the total number of pixels on each shelf. As before, you can multiply that by 4 to get the total area of books that are being drawn. The movie would then be drawing a rectangular area that is 307,200 x 480 = 14,224,000 pixels across. That means the top horizontal line would be 14,224,000 / 2 = 7,776,000 pixels high. I believe this is about how the resolution of VHS looks when compared to motion pictures shot on 35mm film. On the other hand, the resolution on HD TVs are 1080p. This means that there are four times as many pixels used to draw each bookcase of books or set of shelves. So, if the resolution of VHS is 307,200 x 480 = 14,224,000 pixels across then HD would be 14,224,000 / 4 = 3,856,000 pixels high on each level of books or shelves. Each movie would be super-sized by about 1/3 over its standard size on a VHS tape. If you are shooting a movie using the 35mm film process, then it is likely you are shooting at 24 frames per second (FPS). That means that the camera is exposing the film to light for 1/24th of a second each time it shoots a frame. Each frame gets exposed 18 times per second during the process of playing back motion pictures. Since each frame is getting exposed and scanned twice, that means there are 36 frames that exist for every second of motion picture time in real life. cfa1e77820
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