using System;
public class Program
{
unsafe static void BlueFilter (int[,] bitmap)
int length = bitmap.Length;
fixed (int* b = bitmap)
int* p = b;
for (int i = 0; i < length; i++)
*p++ &= 0xFF;
}
static void Main()
int[,] bitmap = { {0x101010, 0x808080, 0xFFFFFF}, {0x101010, 0x808080, 0xFFFFFF} };
BlueFilter (bitmap);
bitmap.Dump();