function FixColumnBrightness(clip c, int column, int input_low, int input_high, int output_low, int output_high){
    c
    ConvertToY8()
    Crop(column,0,1,0)
    Ylevels(input_low,1,input_high,output_low,output_high)
    Overlay(c,last,column,0,mode="luma")
}
function FixRowBrightness(clip c, int row, int input_low, int input_high, int output_low, int output_high){
    c
    ConvertToY8()
    Crop(0,row,0,1)
    Ylevels(input_low,1,input_high,output_low,output_high)
    Overlay(c,last,0,row,mode="luma")
}