Originally posted by Shadow=ASP=:
I dont see where you are trying to get with the 25 and 30 fps and 60 and 75Hz. 25fps is the norm on tv broadcasting, 30fps is not a standard for anything. 60 and 75Hz have become todays standard refresh rate for LCD, though one can argue whether the 75Hz is needed.
30 Hz is standard for several HDTV formats eg. in Europe, because 25fps is seen as too few fps for smooth playback (I also added the 60 Hz formats):
- 1080p60
- 1080p30
- 1080i60 (psf)
- 720p60
- 720p30
- 720i60 (psf)
psf means Progressive Scan with Segmented Frames (aka half-frames or interlaced), so 60 Hz interlaced are effectively 30 Hz full frame.
The NTSC color format, eg. used in the US runs at 30/1,001 = ca. 29,97003 Hz ~ 30Hz
NTSC b/w runs at exactly 30 Hz.
