FixChromaticAberration

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copy the code below into a file 'FixChromaticAberration.avsi' in your AviSynth plugins directory or directly into your script:
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{{FilterCat4|External_filters|Scripts|Restoration_filters|Chroma correction}}
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{{Filter3
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|martin53 at doom9
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|04/09/2007
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|3=[[Media:FixChromaticAberration.avsi|FixChromaticAberration.avsi]]
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|4=Chroma Correction
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|5=
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|6=[http://forum.doom9.org/showthread.php?t=162286 Doom9 Thread]}}
  
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  ###################################################################################
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<br>
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  #
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== Description ==
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  # This AviSynth function stretches the red, green and/or blue channel according to
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A script to reduce [http://en.wikipedia.org/wiki/Chromatic_aberration chromatic aberration]. This function stretches the red, green and/or blue channel according to a given factor symmetrically around the center of the frame and crops it afterwards. Note that chromatic aberration also smears the image a bit, which is not compensated by this function.
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  # a given factor symmetrically around the center of the frame and crops it afterwards.
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  #
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  # Parameters: clip, red, green, blue.
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  # red, green and blue are stretching (resizing) factors against the original clip size.
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  # The function returns the clip in RGB24 colorspace.
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  #
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  # Factors of e.g. red=1.015, green=1.01 allow to compensate the colored edges near the
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  # corners of the image which appear from lenses with 'chromatic aberration'.
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  #
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  # If a factor is below 1.0, a that color will be fitted with black corners into the frame.
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  #
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  # x and y allow to set the center of the aberration circle. It defaults to the center
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  # of the image.
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  #
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  # Note that chromatic aberration also smears the image a bit, which is not compensated
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  # by this function.
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  #
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  # Martin Wagener at gmx.de, 04/09/2007
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  #
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  ###################################################################################
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  function FixChromaticAberration(clip "clip", val "red", val "green", val "blue", val "x", val "y")
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  {
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      r= default(red,1)
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      g= default(green,1)
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      b= default(blue,1)
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      c= (IsRGB(clip)) ? clip : ConvertToRGB(clip)
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      w= c.Width()
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      w2= round(w*0.5)
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      h= c.Height()
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      h2= round(h*0.5)
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      xi= default(x,w*0.5)
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      xi= (xi<0)?0:xi
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      xi= (xi>=w)?w-1:xi
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      yi= default(y,h*0.5)
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      yi= (yi<0)?0:yi
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      yi= (yi>=h)?h-1:yi
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      rw= round(r*w)
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      rh= round(r*h)
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      rl= round((r-1)*xi)
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      rt= round((r-1)*yi)
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      gw= round(g*w)
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      gh= round(g*h)
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      gl= round((g-1)*xi)
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      gt= round((g-1)*yi)
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      bw= round(b*w)
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      bh= round(b*h)
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      bl= round((b-1)*xi)
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      bt= round((b-1)*yi)
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      rc= (r>1) ? LanczosResize(c,rw,rh).Crop(rl,rt,w,h) : c
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      gc= (g>1) ? LanczosResize(c,gw,gh).Crop(gl,gt,w,h) : c
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      bc= (b>1) ? LanczosResize(c,bw,bh).Crop(bl,bt,w,h) : c
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      rcs= (r<1) ? LanczosResize(c.AddBorders(-rl,-rt,w-rw+rl,h-rh+rt),w,h) : rc
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      gcs= (g<1) ? LanczosResize(c.AddBorders(-gl,-gt,w-gw+gl,h-gh+gt),w,h) : gc
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      bcs= (b<1) ? LanczosResize(c.AddBorders(-bl,-bt,w-bw+bl,h-bh+bt),w,h) : bc
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      MergeRGB(rcs, gcs, bcs)
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  }
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Back to [[Shared functions]].
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<br>
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[[Category:Shared_functions]]
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== Requirements ==
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* AviSynth 2.5.8 or [http://sourceforge.net/projects/avisynth2/ greater]
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* Supported color formats: [[RGB32]], [[RGB24]]
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<br>
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== [[Script variables|Syntax and Parameters]] ==
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:{{Template:FuncDef|FixChromaticAberration (clip clip, val "red", val "green", val "blue", val "x", val "y")}}
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<br>
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::{{Par2| |clip| }}
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:::Input clip.
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<br>
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::{{Par2|red|val|1}}
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::{{Par2|green|val|1}}
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::{{Par2|blue|val|1}}
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:::{{Template:FuncDef3|red}}, {{Template:FuncDef3|green}} and {{Template:FuncDef3|blue}} are stretching (resizing) factors against the original clip size. Factors of e.g. <code>{{Template:FuncDef3|red}}=1.015</code>, <code>{{Template:FuncDef3|green}}=1.01</code> allow to compensate the colored edges near the corners of the image which appear from lenses with 'chromatic aberration'.
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<br>
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::{{Par2|x|val| }}
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::{{Par2|y|val| }}
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:::{{Template:FuncDef3|x}} and {{Template:FuncDef3|y}} allow to set the center of the aberration circle. It defaults to the center of the image.
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<br>
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== Examples ==
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FixChromaticAberration with default settings:
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[[AviSource]]("Blah.avi")
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FixChromaticAberration(red=1, green=1, blue=1)
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<br>
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== Changelog ==
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Version      Date(D/M/Y)      Changes<br>
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              04/09/2007      - Initial release
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<br>
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-----------------------------------------------
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'''Back to [[External_filters#Chroma_correction|External Filters]] &larr;'''

Latest revision as of 00:39, 25 June 2018

Abstract
Author martin53 at doom9
Version 04/09/2007
Download FixChromaticAberration.avsi
Category Chroma Correction
License
Discussion Doom9 Thread


Contents

[edit] Description

A script to reduce chromatic aberration. This function stretches the red, green and/or blue channel according to a given factor symmetrically around the center of the frame and crops it afterwards. Note that chromatic aberration also smears the image a bit, which is not compensated by this function.


[edit] Requirements


[edit] Syntax and Parameters

FixChromaticAberration (clip clip, val "red", val "green", val "blue", val "x", val "y")


clip   =
Input clip.


val  red = 1
val  green = 1
val  blue = 1
red, green and blue are stretching (resizing) factors against the original clip size. Factors of e.g. red=1.015, green=1.01 allow to compensate the colored edges near the corners of the image which appear from lenses with 'chromatic aberration'.


val  x =
val  y =
x and y allow to set the center of the aberration circle. It defaults to the center of the image.


[edit] Examples

FixChromaticAberration with default settings: 

AviSource("Blah.avi")
FixChromaticAberration(red=1, green=1, blue=1)


[edit] Changelog 

Version      Date(D/M/Y)      Changes

             04/09/2007       - Initial release


Back to External Filters ←

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