View source for GradFun2DBmod

{{FilterCat4|External_filters|Scripts|Restoration_filters|Debanding}}
{{Filter3
|{{Author/LaTo}}
|v1.5 - Update 2009/12/30
|[http://latoninf.free.fr/d9/GF/GradFun2DBmod.v1.5.avsi GradFun2DBmod.v1.5.avsi]
|Debanding
|
|6=[http://forum.doom9.org/showthread.php?t=144537 Doom9 Thread]}}
== Description ==
An advanced [http://en.wikipedia.org/wiki/Colour_banding debanding] script based on GradFun2DB. 
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== Requirements ==
* AviSynth 2.5.8 or later
* [[FAQ_different_types_content#How_do_I_recognize_progressive.2C_interlaced.2C_telecined.2C_hybrid_and_blended_content.3F|Progressive]] input only 
* Supported color formats: [[YV12]]
=== Required Plugins ===
Latest versions of the following filters are recommended unless stated otherwise.<br>
* [[AddGrainC]]
* [[GradFun2db]]
* [[MaskTools2]]
*<strike>RemoveGrain - part of the [[RemoveGrain v1.0b]] package.</strike>
*[[RgTools]] - recommended drop-in replacement for RemoveGrain!
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== [[Script variables|Syntax and Parameters]] ==
{{Template:FuncDef|GradFun2DBmod (clip input, float "thr", float "thrC", int "mode", float "str", float "strC", int "temp", int "adapt", string "custom", bool "mask", int "radius", int "range", bool "show", int "screenW", int "screenH")}}
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:{{Par2|input|clip| }}
::Input clip.

===Dither===
:{{Par2|thr|float|1.2}}
::GradFun2db <tt>"thr"</tt> parameter; threshold representing the strength of the filter on the luma channel.

:{{Par2|thrC|float|1.2}}
::Same as {{Template:FuncDef3|thr}} but for the chroma channels. If this parameter is not specified it defaults to the value of {{Template:FuncDef3|thr}}. 

:{{Par2|mode|int|2}}
::Mode for the addition of 16 pixels around the image. Turning this parameter off will leave the outer 16 pixels on all borders unprocessed, this is a limitation of GradFun2db.
<ul><DD><pre style="width: 75%;"> 
 0 = Off                             [same as GradFun2db]
 1 = AddBorders  (speed:+ quality:-) [same as GradFunk]
 2 = PointResize (speed:+ quality:+) [recommended]
 3 = Flip/Stack  (speed:- quality:+) [same as GradFunkMirror]
</pre></ul>

===Grain===
:{{Par2|str|float|0.8}}
::AddGrainC <tt>"var"</tt> parameter; the standard deviation (strength) of the luma noise, 0.0 is disabled.

:{{Par2|strC|float|0.0}}
::AddGrainC <tt>"uvar"</tt> parameter; the standard deviation (strength) of the chroma noise, 0.0 is disabled (default).

:{{Par2|temp|int|50}}
::Strength for temporal stabilization. 
::*-1  = off
::*0   = nervous grain
::*50  = half and half
::*100 = calm grain
::Range: -1 to 100

:{{Par2|adapt|int|64}}
::Threshold for luma-adaptative grain.
::*-1  = off
::*0   = source
::*255 = invert
::Range: -1 to 255

:{{Par2|custom|string|"empty"}}
::Use your own grain generator instead of AddGrainC (temp & adapt parameters are on, set -1 to turn off).

===Mask===
:{{Par2|mask|bool|true}}
::Use adaptative deband mask(dither/grain is only applied to areas with banding's susceptibility).

:{{Par2|radius|int|2}}
::Radius for the mask (1 is the fastest, 2-3 are slower)

:{{Par2|range|int|2}}
::Range used in the mask (1-3 are good value)

===Debug===
:{{Par2|show|bool|false}}
::Show debug clip & information [http://latoninf.free.fr/d9/GF/show.png].

:{{Par2|screenW|int|1280}}
:{{Par2|screenH|int|1024}}
::Screen resolution (for show clip).
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==Examples==
GradFun2DBmod with default settings:
 [[AviSource]]("blah.avi")
 GradFun2DBmod (thr=1.2, thrC=1.2, mode=2, str=0.8, strC=0.0, temp=50, adapt=64, custom="empty", \
                mask=true, radius=2, range=2, show=false, screenW=1280, screenH=1024)
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==External Links ==
*[http://forum.doom9.org/showthread.php?t=144537 Doom9 Forum] - GradFun2DBmod discussion.
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