原文:

/// 
        /// Image merge process.        /// 
        /// The background image.        /// The source image.        /// One parameter, from 0 to 1.        /// 
                public static WriteableBitmap ImageMerge(WriteableBitmap bacImage, WriteableBitmap dstImage, double k)        {            if (bacImage != null && dstImage != null)            {                int w = dstImage.PixelWidth;                int h = dstImage.PixelHeight;                int sw = bacImage.PixelWidth;                int sh = bacImage.PixelHeight;                WriteableBitmap srcImage = new WriteableBitmap(w, h);                byte[] dstValue = dstImage.PixelBuffer.ToArray();                byte[] bacValue = bacImage.PixelBuffer.ToArray();                byte[] tempValue = new byte[dstValue.Length];                int r = 0, g = 0, b = 0, R = 0, G = 0, B = 0;                for (int y = 0; y < h; y++)                {                    for (int x = 0; x < w; x++)                    {                        int tx = x % sw;                        int ty = y % sh;                        b = bacValue[tx * 4 + ty * w * 4];                        g = bacValue[tx * 4 + 1 + ty * w * 4];                        r = bacValue[tx * 4 + 2 + ty * w * 4];                        B = dstValue[x * 4 + y * w * 4];                        G = dstValue[x * 4 + 1 + y * w * 4];                        R = dstValue[x * 4 + 2 + y * w * 4];                        double xr = 0.0, xb = 0.0, xg = 0.0;                        xr = ((double)r - ((double)R - (double)k * 255.0)) / (2.0 * 255.0 * k);                        xg = ((double)g - ((double)G - (double)k * 255.0)) / (2.0 * 255.0 * k);                        xb = ((double)b - ((double)B - (double)k * 255.0)) / (2.0 * 255.0 * k);                        tempValue[x * 4 + y * w * 4] = (byte)(255.0 * (1.0 - 3.0 * xb * xb + 2.0 * xb * xb * xb));                        tempValue[x * 4 + 1 + y * w * 4] = (byte)(255.0 * (1.0 - 3.0 * xg * xg + 2.0 * xg * xg * xg));                        tempValue[x * 4 + 2 + y * w * 4] = (byte)(255.0 * (1.0 - 3.0 * xr * xr + 2.0 * xr * xr * xr));                    }                }                Stream sTemp = srcImage.PixelBuffer.AsStream();                sTemp.Seek(0, SeekOrigin.Begin);                sTemp.Write(tempValue, 0, w * 4 * h);                return srcImage;            }            else            {                return null;            }        }

最后，分享一个专业的图像处理网站（微像素），里面有很多源代码下载：