Why are there bars going acrossed the screens of tv's and computers and stuff on some tv shows?
Answer:
I believe.it has something to do with the resolution of the screen. I noticed that for the first time back in the 6th grade.
Pretty cool isn't it?
1. TV and computer monitors work by filling the screen with the latest information one line at a time. The duration of the glow emitted by the individual pixels in combination with our brain's way of processing visual information (called "persistence of vision") give us the illusion of a steady picture.
2. Film and TV cameras lack "persistence of vision, and if the phosphor pixels fade below the camera's ability to register incoming light, a part of the screen in the picture will appear dark.
3. Since screens are usually filled in from top to bottom in horizontal rows, the dark part of these screens will appear to be horizontal dark bands.
Because of refresh rates. The film is picking it up frame by frame, the human eye alone cannot pick them up just by looking at the screen.
It is called a " strobe effect " this is how a timing light works that a motor mechanic uses to time ignition in cars, if you open and close your eyes as quickly as you can while looking at the TV you see a similar effect to the one you have described , also try putting a fan that is running in front of the tv and look at the tv through the fan and see the fan blades standing still or moving very slowly , Cheers Pete
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