FixChromaBleedingMod

# FixChromaBleedingMod v1.1

Function FixChromaBleedingMod (clip input, int "Shift", float "thr", float "strength", bool "f") {

  Shift = default ( Shift,       -4 )
  thr   = default ( thr,       4.0 )
  stre = default ( strength,       0.8 )
  f =  default ( f,       true )

  # prepare to work on the V channel and reduce to speed up and filter noise
  areaf = input.tweak3(sat=thr).VtoY.ReduceBy2
  area = input.tweak3(sat=thr).VtoY.Blur(1.5)

  # select and normalize both extremes of the scale
  red = f ? areaf.Levels(255,1.0,255,255,0) : area.Levels(255,1.0,255,255,0)
  blue = f ? areaf.Levels(0,1.0,0,0,255) : area.Levels(0,1.0,0,0,255)

  # merge both masks
  mask = MergeLuma(red, blue, 0.5).Levels(250,1.0,250,255,0).mt_expand(mode="both", y=3,u=3,v=3).mt_inflate(y=3,u=3,v=3)

  # expand to cover beyond the bleeding areas and shift to compensate the resizing
   mask = mask.mt_edge("0 0 0 1 0 0 0 0 0", 0,255,0,255).mt_edge("1 1 1 1 1 1 0 0 0", 0,255,0,255).mt_expand(mode="both", y=3,u=3,v=3).mt_inflate(y=3,u=3,v=3)

  # back to full size and binarize (also a trick to expand)
  mask = mask.BilinearResize(Width(input),Height(input)).Levels(10,1.0,10,0,255).mt_expand(mode="both", y=3,u=3,v=3).mt_inflate(y=3,u=3,v=3)

  # prepare a version of the image that has its chroma shifted and less saturated
  input_c = input.ChromaShift(C=Shift).tweak3(sat=stre)

  # combine both images using the mask
  return input.overlay(input_c,mask=mask,mode="blend",opacity=1)
}