View source for UnFilter

{{FilterCat|Plugins|External_filters|Adjustment_filters|Sharpeners}}
{{Template:FuncDef|UnFilter(clip source,  int ''HSharp'', int ''VSharp'') }}
{{Filter
|[http://www.trbarry.com Tom Barry]
|0.0.1.5
|[http://www.trbarry.com/UnFilter.zip UnFilter.zip]
|Adjustment filters
|[[YV12]]
|GPL
}}
== Abstract ==
UnFilter is a simple and reasonably fast Avisynth Soften/Sharpen filter.

It implements 5-tap user adjustable horizontal and vertical filters designed to 
(slightly) reverse previous efforts at softening or edge enhancement that are
common (but ugly) in DVD mastering.  Since DVDs were intended originally
for interlaced displays this has caused content providers to vertically filter
them even a bit more to hide interlacing artifacts.  They sometimes overdo
the edge enhancement.

When softening it will attempt to approximate the inverse of a simple 3-tap edge
enhancement filter. When sharpening it will attempt to approximate the inverse
of a simple 3-tap softening filter.  For the math and logic involved see
the comments in the UnFilterALL.inc member included in zip file.

The effects are fairly mild but be aware that excessive sharpening makes things 
harder to compress and may bring about the dreaded "edge enhancement artifacts"
the people complain about in DVDs from some studios.  And while excessive 
softness may hide noise it loses detail and generally just looks ugly. So it is
probably best to just try to reverse whatever has already been done to your source.

UnFilter should run on all MMX machines or higher. It has also has some added code 
for 3DNOW instructions for when it is running on a K6-II or higher and some SSEMMX 
for P3 & Athlon.

==Known issues and limitations==

Assumes YUV (YUY2) or YV12 Frame Based input. Use an AVIsynth function to convert first if  needed.        

Currently still requires the pixel width to be a multiple of 2. 

YV12 support for Avisynth 2.5 alpha release only.

== Requires Filters ==
 
[http://www.trbarry.com/UnFilter.zip Unfilter.dll] 


==Parameters==

{{ParR|HSharp|int|0|-100-100}}
Horizontal sharpness.  Valid values are from -100 (max softness) through zero (neutral) through +100 (max sharpness).

{{ParR|VSharp|int|0|-100-100}}
Vertical sharpness.  Valid values are from -100 (max softness) through zero (neutral) through +100 (max sharpness).

== Examples== 

Extreme sharpening
 LoadPlugin("F:\UnFilter\UnFilter.dll")
 Avisource("D:\wherever\myfile.avi")
 UnFilter(100,100)

==External Links==
*[http://www.trbarry.com Tom Barry's Avisynth filters]
*[http://forum.doom9.org/showthread.php?s=&threadid=28197&pagenumber=3 Doom9 discussion]