Why to pictures of televisions and monitors appear to have lines?

because, the television is an illusion, jut bunches of tiny dots and lines our brain connects it all together. something to do with the speed at which the tv refreshes images compared to the speed a cameras shutter opens... Because to get the picture on the screen, there are lines that are continuously changing very fast. When a photo is taken, the shutter speed is too slow to freeze the action of the lines. So you can see the lines moving. It's like if you were to take a photo of a car driving by at a slow shutter speed, it would blurr the car. You are sitting too close.

TV's and monitors have what is called a picture element, usually shortened to pixel. Like your computer monitor may have 1280 x 1024 pixels. That means it has 1280 small pixels across the screen in a line. There are 1024 of these lines one right under the next. Each pixel contains 3 sub pixels, one each of red, green or blue. Thats where the term RGB comes from. By mixing differing amounts of red green and blue, you get any color you want. It is limited by the number of bits used to encode each color. If you look at your monitor settings, you can choose 16 bit or 32 bit. With 32 bit they break the amount of color into over 4 billion steps. A 32 bit number tells the monitor what value to display. 16 bit color only breaks the color intensity into 65,536 steps. So the color may not look exactly right, because your eye is very sensitive. Hope this 'clears' up a few things. sometime when you are not busy, flick some water on your sceen, It will magnify some spots and looks cool. Don't use too much, way less than a drop.

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