function FixColumnBrightness(clip c, int column, int input_low, int input_high, int output_low, int output_high){
    c
    Overlay(ExtractY(),Ylevels(input_low,1,input_high,output_low,output_high).Crop(column,0,1,0),column,0,mode="luma")
    CombinePlanes(last, c, planes="YUV", pixel_type="YV12")
}
function FixRowBrightness(clip c, int row, int input_low, int input_high, int output_low, int output_high){
    c
    Overlay(ExtractY(),Ylevels(input_low,1,input_high,output_low,output_high).Crop(0,row,0,1),0,row,mode="luma")
    CombinePlanes(last, c, planes="YUV", pixel_type="YV12")
}