derange.avsi

function derange(clip src,float "scale")
{
scale=default(scale,1.0)
low=string(256.0*(16.0-16.0*scale))
rangel=string(219.0+36.0*scale)
rangec=string(224.0+31.0*scale)
dither_lut16(src,yexpr="x "+low+" - "+rangel+" / 219 * 4096 + ",uexpr="x "+low+" - "+rangec+" / 224 * 4096 + ",vexpr="x "+low+" - "+rangec+" / 224 * 4096 + ",u=3,v=3)
}