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Old 09-25-04, 08:31 AM   #1
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Join Date: Sep 2004
Posts: 4
Default TVFlickerFilter causes blurriness

On my Geforce FX5700 (Asus 9570/TD) the TVFlickerFilter setting in nvidia-settings seems to have only a few distinguishable modes: 0 gives heavy flicker, 127 gives flicker but semi-pleasant image for movies, 128 gives stable text but is really blurry. >128 is no different from the setting 128.

Can I have the stability of TVFlickerFilter setting 128 but without blur?
ImageSharpening does not help much, but setting it to 4.0 does improve somewhat.

The TV-Out image quality in general compared to my old Geforce3 Ti200 is much worse I think.

I use drivers 6111 and SVIDEO output to a PAL-B TV with 800x600 res:

(II) NVIDIA(1): TV: Using hsync range of 30.00-50.00 kHz
(II) NVIDIA(1): TV: Using vrefresh range of 50.00-61.00 Hz
(**) NVIDIA(1): Validated modes for display device TV-0:
(**) NVIDIA(1): Default mode "800x600": 40.0 MHz, 37.9 kHz, 60.3 Hz
(**) NVIDIA(1): Default mode "640x480": 25.2 MHz, 31.5 kHz, 60.0 Hz
(**) NVIDIA(1): Default mode "800x600": 36.0 MHz, 35.2 kHz, 56.2 Hz
(**) NVIDIA(1): Mode "720x576": 32.7 MHz, 35.8 kHz, 60.0 Hz
(**) NVIDIA(1): Default mode "400x300": 20.0 MHz, 37.9 kHz, 60.3 Hz (D)
(**) NVIDIA(1): Default mode "400x300": 18.0 MHz, 35.2 kHz, 56.3 Hz (D)
(**) NVIDIA(1): Default mode "320x240": 12.6 MHz, 31.5 kHz, 60.1 Hz (D)
(II) NVIDIA(1): Virtual screen size determined to be 800 x 600

I have about 10m SVHS cable connected with a SVIDEO to SCART converter to the TV. Could I improve cabling to reduce flicker?
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Old 09-25-04, 10:45 AM   #2
Join Date: Jul 2002
Location: Netherlands, Europe
Posts: 2,105
Default Re: TVFlickerFilter causes blurriness

It is normal that reducing flicker goes at the cost of image quality. When you watch television the tv programs contain some sort of compensation for the problem. In case you connect a computer to the tv, the image needs to be interlaced. (lets say that for example every second line is being thrown away) Flicker filters useally take a sort of average of lets say line "1, 2 and 3" and display that line. This reduces flickering but makes things more blurry.
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