str_y = mt_polish("(x==128)? 128 : ((x<128)? ( (((127-"+String(range_y)+")<x)&(x<(128-"+String(nmin_y)+")))? 0 : 56 ) : ( (((128+"+
String(nmin_y)+")<x)&(x<(129+"+String(range_y)+"))) ? 255 : 199 ))")
str_uv = mt_polish("(x==128)? 128 : ((x<128)? ( (((127-"+String(range_uv)+")<x)&(x<(128-"+String(nmin_uv)+")))? 0 : 56 ) : ( (((128+
"+String(nmin_uv)+")<x)&(x<(129+"+String(range_uv)+"))) ? 255 : 199))")
eval_y = Select(chroma, 3, 2, 3)
eval_u = Select(chroma, 2, 3, 3)
eval_v = Select(chroma, 2, 3, 3)
return c.mt_lut(yExpr=str_y,expr=str_uv,Y=eval_y,U=eval_u,V=eval_v)
