@Wilbert
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I also don't understand this. I guess you are talking about the Nyquist frequency here.
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No, i'm not talking about the Nyquist Theorem here. First we have to make clear what we are talking about
: Horizontal Lines. They aren't Pixels. One Line is the Time for "drawing" a complete Sine-Waveform (argh, my english-problem again). It is the periodic Time of the Waveform. So a Line can start Black and end up White (or anything between them). Between the Mixima/Minima there can be any shade of greey.
240 Lines means, you can have 240 complete Waveforms per Scanline.
You have to capture 2 Pixels per Line to get the start- and endpoint of the true signal (the sine wave). If you capture only one Pixel per Line, you get the AVG of the Waveform - and that's never white or black, it is always a shade of greey.
Sorry, i can't descripe it better in english
