What make and model is your TV??? Sharpness is artificial. Most videophiles or calibration professionals will tell you that Sharpness shouldn't be necessary when viewing HD content, so it should be disabled, or set to zero. However, this might not be what looks best for everyone. If you feel that the picture is slightly blurred, or for example the edges of text are blurry and not defined, then you can increase sharpness slightly, say to 10 or so, but it should not be set too high. As a general rule, the default sharpness setting for most HDTV's is much, much too high. Try setting it to zero, and live with it for a few days. The picture will intitally look softer, but understand that, again, sharpness is artificial, and is not part of the intended image. With it set to zero, you are viewing the image as intended. Also, if you are using component rather than HDMI, you may benefit from a bit of sharpness, as component can appear a little less sharp.
Depends on the TV, you buy a DVD or Blu-ray to help you optimize your home theater, you can call professionals to come out and calibrate it for you or you can steal settings for your TV from a forum like AVSforum :)
Sometimes it also depends on what your watching. I personally like the sharpness really low on SD TV channels to blur the image artifacts but then set it a bit higher for other higher quality sources like HD and videogames so they aren't blurry.
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