# Using this (more proper) method to deal with RGB content yields better results
r = ShowRed("YV12")
g = ShowGreen("YV12")
b = ShowBlue("YV12")
interleave(r,g,b)

    uv   = 3
    sstr = 2.7
    amnt = 255
    uv2  = uv
    STR  = string(sstr)
    AMN  = string(amnt)
    clp=last

    vblur  = clp.mt_convolution("50 99 50","1",U=uv,V=uv)
    hblur  = clp.mt_convolution("1","50 99 50",U=uv,V=uv)
    masky  = mt_luts (vblur, hblur, mode="avg", pixels=mt_circle(1)+string(0), expr="x y - abs 2 > 255 0 ?" )
    vblur = mt_merge(clp,vblur,masky)

# limiting to no less than pixel change of 13 to exclude faint checkerboard blur
    mt_lutxy(clp,vblur,"x y - abs 13 < x y ?")

# from here use gdapt dither detection algo to mask out text, sprites...

# back to RGB
mergergb(SelectEvery (3, 0), SelectEvery (3, 1), SelectEvery (3, 2))