The VideoLAN Forums

I have my computer hooked up to my TV via HDMI.

With VLC media player when playing back video files (mainly MKV files) blacks are greyish. At first I thought it was an issue with my TV, but I tried a different video player with the same files and black was dark black as it should be.

I don't get why it's like this, I'd prefer to just use VLC as it supports more file types.

Any idea why or how to fix this?

http://wiki.videolan.org/VSG:Video:Color_nVidia

You can also try to enable or disable some video options such as Overlay and/or Hardware YUV -> RGB conversions.