GradFun2DBmod

Abstract
Author	LaTo
Version	v1.5 - Update 2009/12/30
Download	GradFun2DBmod.v1.5.avsi
Category	Debanding
License
Discussion	Doom9 Thread

Description

An advanced debanding script based on GradFun2DB.

Requirements

• AviSynth 2.5.8 or later
• Progressive input only
• Supported color formats: YV12

Required Plugins

Latest versions of the following filters are recommended unless stated otherwise.

• AddGrainC
• GradFun2db
• MaskTools2
• RemoveGrain - part of the RemoveGrain v1.0b package.
• RgTools - recommended drop-in replacement for RemoveGrain!

Syntax and Parameters

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")

clip  input =

Input clip.

Dither

float  thr = 1.2

GradFun2db "thr" parameter; threshold representing the strength of the filter on the luma channel.

float  thrC = 1.2

Same as thr but for the chroma channels. If this parameter is not specified it defaults to the value of thr.

int  mode = 2

Mode for the addition of 16 pixels around the image. Turning this parameter off will leave the outer 16 pixels on all borders are left unprocessed; this is a limitation of GradFun2db.

 
 0 = Off                             [same as GradFun2db]
 1 = AddBorders  (speed:+ quality:-) [same as GradFunk]
 2 = PointResize (speed:+ quality:+)
 3 = Flip/Stack  (speed:- quality:+) [same as GradFunkMirror]

Grain

float  str = 0.8

AddGrainC "var" parameter; the standard deviation (strength) of the luma noise, 0.0 is disabled.

float  strC = 0.0

AddGrainC "uvar" parameter; the standard deviation (strength) of the chroma noise, 0.0 is disabled (default).

int  temp = 50

Strength for temporal stabilization.

• -1 = off
• 0 = nervous grain
• 50 = half and half
• 100 = calm grain

Range: -1 to 100

int  adapt = 64

Threshold for luma-adaptative grain.

• -1 = off
• 0 = source
• 255 = invert

Range: -1 to 255

string  custom = "empty"

Use your own grain generator instead of AddGrainC (temp & adapt parameters are on, set -1 to turn off).

Mask

bool  mask = true

Use adaptative deband mask(dither/grain is only applied to areas with banding's susceptibility).

int  radius = 2

Radius for the mask (1 is the fastest, 2-3 are slower)

int  range = 2

Range used in the mask (1-3 are good value)

Debug

bool  show = false

Show debug clip & information [1].

int  screenW = 1280

int  screenH = 1024

Screen resolution (for show clip).

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=true, show=false, screenW=1280, screenH=1024)

External Links

• Doom9 Forum - GradFun2DBmod discussion.

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