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public static int getAverageGrayValue(Bitmap bmp)
{
int average = 0;
for (int i = 0; i < bmp.Width; i++)
{
for (int j = 0; j < bmp.Height; j++)
{
Color color = bmp.GetPixel(i, j);
average += color.B;
}
}
average = (int)average / (bmp.Width * bmp.Height);
return average;
}