function FixRowBrightnessProtect(clip c, int row, int input_low, int input_high, int output_low, int output_high, int protect_value){
    c
    ExtractY()
    mt_invert()
    SmoothLevels(255-input_low,1,255-input_high,255-output_low,255-output_high,protect=protect_value,chroma=0,useMT=2)
    mt_invert()
    Overlay(c.ExtractY(),Crop(0,row,0,1),0,row,mode="luma")
    CombinePlanes(last, c, planes="YUV", pixel_type="YV12")
}

function FixColumnBrightnessProtect(clip c, int column, int input_low, int input_high, int output_low, int output_high, int protect_value){
    c
    ExtractY()
    mt_invert()
    SmoothLevels(255-input_low,1,255-input_high,255-output_low,255-output_high,protect=protect_value,chroma=0,useMT=2)
    mt_invert()
    Overlay(c.ExtractY(),Crop(column,0,1,0),column,0,mode="luma")
    CombinePlanes(last, c, planes="YUV", pixel_type="YV12")
}