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Originally Posted by NYPlayer
Has anyone used the sharpen filter in Avisynth, if you have what are the optimal settings?
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Hi NYPlayer:
I haven't used "sharpen" filters, because it's not recommended for mpeg conversion. If this is your intention.
The sharper the image, the more visible macro block edges.
Unless your source is extremely clean. And then you wouldn't need the filter anyway
Here's a more complete definition of sharpen. Also known as "Edge enhancement".
edge enhancement - When films are transferred to video in preparation for DVD encoding, they are commonly run through digital processes that attempt to clean up the picture. These processes include noise reduction (DVNR) and image enhancement. Enhancement increases contrast (similar to the effect of the "sharpen" or "unsharp mask" filters in PhotoShop), but can tend to overdo areas of transition between light and dark or different colors, causing a "chiseled" look or a ringing effect like the haloes you see around streetlights when driving in the rain. Video noise reduction is a good thing, when done well, since it can remove scratches, spots, and other defects from the original film. Enhancement, which is rarely done well, is a bad thing. The video may look sharper and clearer to the casual observer, but fine tonal details of the original picture are altered and lost.
kwag
Unfilter & msharpen as filter that sharp but will not enhance noise also, a negative value of the Blur (Blur-7) filter was suppose to sharpen the image ..... 
