function FixRowBrightnessProtect(clip c, int row, int input_low, int input_high, int output_low, int output_high, int protect_value){
    input_low=Default(input_low,16)
    input_high=Default(input_high,255)
    output_low=Default(output_low,16)
    output_high=Default(output_high,255)
    protect_value=Default(protect_value,20)
    c
    mt_invert()
    SmoothLevels(255-input_low,1,255-input_high,255-output_low,255-output_high,protect=protect_value)
    mt_invert()
    ConvertToY8().Crop(0,row,0,1)
    Overlay(c,last,0,row,mode="luma")
}

function FixColumnBrightnessProtect(clip c, int column, int input_low, int input_high, int output_low, int output_high, int protect_value){
    input_low=Default(input_low,16)
    input_high=Default(input_high,255)
    output_low=Default(output_low,16)
    output_high=Default(output_high,255)
    protect_value=Default(protect_value,20)
    c
    mt_invert()
    SmoothLevels(255-input_low,1,255-input_high,255-output_low,255-output_high,protect=protect_value)
    mt_invert()
    ConvertToY8().Crop(column,0,1,0)
    Overlay(c,last,column,0,mode="luma")
}