wikipedia ad this to say about NTSC color
"NTSC color encoding is used with the system M television signal, which consists of 29.97 interlaced frames of video per second, or the nearly identical system J in Japan. Each frame consists of a total of 525 scanlines, of which 486 make up the visible raster. The remainder (the vertical blanking interval) are used for synchronization and vertical retrace. This blanking interval was originally designed to simply blank the receiver's CRT to allow for the simple analog circuits and slow vertical retrace of early TV receivers. However, some of these lines now can contain other data such as closed captioning and vertical interval timecode (VITC). In the complete raster (ignoring half-lines), the even-numbered or 'lower" scanlines (Every other line that would be even if counted in the video signal, e.g. {2,4,6,...,524}) are drawn in the first field, and the odd-numbered or "upper" (Every other line that would be odd if counted in the video signal, e.g. {1,3,5,...,525}) are drawn in the second field, to yield a flicker-free image at the field refresh frequency of approximately 59.94 Hertz (actually 60 Hz/1.001). For comparison, 576i systems such as PAL-B/G and SECAM uses 625 lines (576 visible), and so have a higher vertical resolution, but a lower temporal resolution of 25 frames or 50 fields per second."
read the rest of the article at http://en.wikipedia.org/wiki/NTSC for good times.
as for swirly's i have no idea what you are talking about and would love to see a picture of one of them in the wild =)
also try backing away from the TV another foot or so. TV have a larger spacing between the pixels as they are desgined to be viewed from afar. compared with a computer monitor that has a much tighter pixel spacing as it is designed to be viewed up closely.
*edit* you could also make the screen slightly blurry to make the scanlines less noticeable also.






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