ContraSharpen.avsi

Function ContraSharpen(clip denoised, clip original, bool "chroma", bool "preblur", bool "preblurc", int "preR", bool "limit", string "blur", int "RGmode", int "RGmodeU", int "Repmode", int "RepmodeU")
{
# contra-sharpening: sharpen the denoised clip, but don't add more to any pixel than what was removed previously.
# script function from Didee from the VERY GRAINY thread

chroma   = Default(chroma,  false  )
preblur  = Default(preblur, true   )
preblurc = Default(preblurc,preblur)
preR     = Default(preR,    1      )
limit    = Default(limit,   true   )
RGmode   = Default(RGmode,  11     )
RGmodeU  = Default(RGmodeU, RGmode )
Repmode  = Default(Repmode, 1      )
RepmodeU = Default(RepmodeU,Repmode)

s      = preblur ? denoised.minblur(preR, preblurc ? 3 : 1) : denoised # Damp down remaining spots of the denoised clip.
allD   = mt_makediff(original, denoised, Y=3, U=chroma?3:1, V=chroma?3:1) # The difference achieved by the denoising.
blured = Defined(blur) ? Eval("s."+blur) : s.removegrain(RGmode, chroma ? RGmodeU : -1)
ssD    = mt_makediff(s, blured, Y=3, U=chroma?3:1, V=chroma?3:1) # The difference of a simple kernel blur.
ssDD   = ssD.repair(allD, mode=Repmode, modeU=chroma?RepmodeU:-1) # Limit the difference to the max of what the denoising removed locally.
ssDD   = limit ? ssDD.mt_lutxy(ssD, "x 128 - abs y 128 - abs < x y ?", Y=3, U=chroma?3:1, V=chroma?3:1) : ssDD # abs(diff) after limiting may not be bigger than before.

denoised.mt_adddiff(ssDD, Y=3, U=chroma?3:2, V=chroma?3:2) # Apply the limited difference. (Sharpening is just inverse blurring.)

return last
}