/// <summary>
        /// 
        /// </summary>
        /// <param name="b"></param>
        /// <param name="nType"></param>
        /// <param name="nThreshold"></param>
        /// <returns></returns>
        public static bool EdgeDetectConvolution(Bitmap b, short nType, byte nThreshold)
        {
            ConvMatrix m = new ConvMatrix();

            // I need to make a copy of this bitmap BEFORE I alter it 80)
            Bitmap bTemp = (Bitmap)b.Clone();

            switch (nType)
            {
                case EDGE_DETECT_SOBEL:
                    m.SetAll(0);
                    m.TopLeft = m.BottomLeft = 1;
                    m.TopRight = m.BottomRight = -1;
                    m.MidLeft = 2;
                    m.MidRight = -2;
                    m.Offset = 0;
                    break;
                case EDGE_DETECT_PREWITT:
                    m.SetAll(0);
                    m.TopLeft = m.MidLeft = m.BottomLeft = -1;
                    m.TopRight = m.MidRight = m.BottomRight = 1;
                    m.Offset = 0;
                    break;
                case EDGE_DETECT_KIRSH:
                    m.SetAll(-3);
                    m.Pixel = 0;
                    m.TopLeft = m.MidLeft = m.BottomLeft = 5;
                    m.Offset = 0;
                    break;
            }

            BitmapFilter.Conv3x3(b, m);

            switch (nType)
            {
                case EDGE_DETECT_SOBEL:
                    m.SetAll(0);
                    m.TopLeft = m.TopRight = 1;
                    m.BottomLeft = m.BottomRight = -1;
                    m.TopMid = 2;
                    m.BottomMid = -2;
                    m.Offset = 0;
                    break;
                case EDGE_DETECT_PREWITT:
                    m.SetAll(0);
                    m.BottomLeft = m.BottomMid = m.BottomRight = -1;
                    m.TopLeft = m.TopMid = m.TopRight = 1;
                    m.Offset = 0;
                    break;
                case EDGE_DETECT_KIRSH:
                    m.SetAll(-3);
                    m.Pixel = 0;
                    m.BottomLeft = m.BottomMid = m.BottomRight = 5;
                    m.Offset = 0;
                    break;
            }

            BitmapFilter.Conv3x3(bTemp, m);

            // GDI+ still lies to us - the return format is BGR, NOT RGB.
            BitmapData bmData = b.LockBits(new Rectangle(0, 0, b.Width, b.Height), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);
            BitmapData bmData2 = bTemp.LockBits(new Rectangle(0, 0, b.Width, b.Height), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);

            int stride = bmData.Stride;
            System.IntPtr Scan0 = bmData.Scan0;
            System.IntPtr Scan02 = bmData2.Scan0;

            unsafe
            {
                byte* p = (byte*)(void*)Scan0;
                byte* p2 = (byte*)(void*)Scan02;

                int nOffset = stride - b.Width * 3;
                int nWidth = b.Width * 3;

                int nPixel = 0;

                for (int y = 0; y < b.Height; ++y)
                {
                    for (int x = 0; x < nWidth; ++x)
                    {
                        nPixel = (int)Math.Sqrt((p[0] * p[0]) + (p2[0] * p2[0]));
                        if (nPixel < nThreshold) nPixel = nThreshold;
                        if (nPixel > 255) nPixel = 255;
                        p[0] = (byte)nPixel;
                        ++p;
                        ++p2;
                    }
                    p += nOffset;
                    p2 += nOffset;
                }
            }

            b.UnlockBits(bmData);
            bTemp.UnlockBits(bmData2);

            return true;
        }
        /// <summary>
        /// 
        /// </summary>
        /// <param name="b"></param>
        /// <returns></returns>
        public static bool EmbossLaplacian(Bitmap b)
        {
            ConvMatrix m = new ConvMatrix();
            m.SetAll(-1);
            m.TopMid = m.MidLeft = m.MidRight = m.BottomMid = 0;
            m.Pixel = 4;
            m.Offset = 127;

            return BitmapFilter.Conv3x3(b, m);
        }
        /// <summary>
        /// 
        /// </summary>
        /// <param name="b"></param>
        /// <returns></returns>
        public static bool EdgeDetectQuick(Bitmap b)
        {
            ConvMatrix m = new ConvMatrix();
            m.TopLeft = m.TopMid = m.TopRight = -1;
            m.MidLeft = m.Pixel = m.MidRight = 0;
            m.BottomLeft = m.BottomMid = m.BottomRight = 1;

            m.Offset = 127;

            return BitmapFilter.Conv3x3(b, m);
        }
        /// <summary>
        /// 
        /// </summary>
        /// <param name="b"></param>
        /// <param name="nWeight"></param>
        /// <returns></returns>
        public static bool Sharpen(Bitmap b, int nWeight /* default to 11*/ )
        {
            ConvMatrix m = new ConvMatrix();
            m.SetAll(0);
            m.Pixel = nWeight;
            m.TopMid = m.MidLeft = m.MidRight = m.BottomMid = -2;
            m.Factor = nWeight - 8;

            return BitmapFilter.Conv3x3(b, m);
        }
        /// <summary>
        /// 
        /// </summary>
        /// <param name="b"></param>
        /// <param name="nWeight"></param>
        /// <returns></returns>
        public static bool MeanRemoval(Bitmap b, int nWeight /* default to 9*/ )
        {
            ConvMatrix m = new ConvMatrix();
            m.SetAll(-1);
            m.Pixel = nWeight;
            m.Factor = nWeight - 8;

            return BitmapFilter.Conv3x3(b, m);
        }
        /// <summary>
        /// 
        /// </summary>
        /// <param name="b"></param>
        /// <param name="nWeight"></param>
        /// <returns></returns>
        public static bool GaussianBlur(Bitmap b, int nWeight /* default to 4*/)
        {
            ConvMatrix m = new ConvMatrix();
            m.SetAll(1);
            m.Pixel = nWeight;
            m.TopMid = m.MidLeft = m.MidRight = m.BottomMid = 2;
            m.Factor = nWeight + 12;

            return BitmapFilter.Conv3x3(b, m);
        }
        /// <summary>
        /// 
        /// </summary>
        /// <param name="b"></param>
        /// <param name="nWeight"></param>
        /// <returns></returns>
        public static bool Smooth(Bitmap b, int nWeight /* default to 1 */)
        {
            ConvMatrix m = new ConvMatrix();
            m.SetAll(1);
            m.Pixel = nWeight;
            m.Factor = nWeight + 8;

            return BitmapFilter.Conv3x3(b, m);
        }
        /// <summary>
        /// 
        /// </summary>
        /// <param name="b"></param>
        /// <param name="m"></param>
        /// <returns></returns>
        public static bool Conv3x3(Bitmap b, ConvMatrix m)
        {
            // Avoid divide by zero errors
            if (0 == m.Factor) return false;

            Bitmap bSrc = (Bitmap)b.Clone();

            // GDI+ still lies to us - the return format is BGR, NOT RGB.
            BitmapData bmData = b.LockBits(new Rectangle(0, 0, b.Width, b.Height), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);
            BitmapData bmSrc = bSrc.LockBits(new Rectangle(0, 0, bSrc.Width, bSrc.Height), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);

            int stride = bmData.Stride;
            int stride2 = stride * 2;
            System.IntPtr Scan0 = bmData.Scan0;
            System.IntPtr SrcScan0 = bmSrc.Scan0;

            unsafe
            {
                byte* p = (byte*)(void*)Scan0;
                byte* pSrc = (byte*)(void*)SrcScan0;

                int nOffset = stride - b.Width * 3;
                int nWidth = b.Width - 2;
                int nHeight = b.Height - 2;

                int nPixel;

                for (int y = 0; y < nHeight; ++y)
                {
                    for (int x = 0; x < nWidth; ++x)
                    {
                        nPixel = ((((pSrc[2] * m.TopLeft) + (pSrc[5] * m.TopMid) + (pSrc[8] * m.TopRight) +
                            (pSrc[2 + stride] * m.MidLeft) + (pSrc[5 + stride] * m.Pixel) + (pSrc[8 + stride] * m.MidRight) +
                            (pSrc[2 + stride2] * m.BottomLeft) + (pSrc[5 + stride2] * m.BottomMid) + (pSrc[8 + stride2] * m.BottomRight)) / m.Factor) + m.Offset);

                        if (nPixel < 0) nPixel = 0;
                        if (nPixel > 255) nPixel = 255;

                        p[5 + stride] = (byte)nPixel;

                        nPixel = ((((pSrc[1] * m.TopLeft) + (pSrc[4] * m.TopMid) + (pSrc[7] * m.TopRight) +
                            (pSrc[1 + stride] * m.MidLeft) + (pSrc[4 + stride] * m.Pixel) + (pSrc[7 + stride] * m.MidRight) +
                            (pSrc[1 + stride2] * m.BottomLeft) + (pSrc[4 + stride2] * m.BottomMid) + (pSrc[7 + stride2] * m.BottomRight)) / m.Factor) + m.Offset);

                        if (nPixel < 0) nPixel = 0;
                        if (nPixel > 255) nPixel = 255;

                        p[4 + stride] = (byte)nPixel;

                        nPixel = ((((pSrc[0] * m.TopLeft) + (pSrc[3] * m.TopMid) + (pSrc[6] * m.TopRight) +
                            (pSrc[0 + stride] * m.MidLeft) + (pSrc[3 + stride] * m.Pixel) + (pSrc[6 + stride] * m.MidRight) +
                            (pSrc[0 + stride2] * m.BottomLeft) + (pSrc[3 + stride2] * m.BottomMid) + (pSrc[6 + stride2] * m.BottomRight)) / m.Factor) + m.Offset);

                        if (nPixel < 0) nPixel = 0;
                        if (nPixel > 255) nPixel = 255;

                        p[3 + stride] = (byte)nPixel;

                        p += 3;
                        pSrc += 3;
                    }
                    p += nOffset;
                    pSrc += nOffset;
                }
            }

            b.UnlockBits(bmData);
            bSrc.UnlockBits(bmSrc);

            return true;
        }