[函数名称]

图像霓虹效果函数NeonProcess(WriteableBitmap src)

上述公式进行开方即可。

[函数代码]

       ///<summary>

       /// Neon process.

       ///</summary>

       ///<param name="src">Source image.</param>

       ///<returns></returns>

       publicstaticWriteableBitmap NeonProcess(WriteableBitmap src)////15霓虹处理

       {

           if(src!=null )

           {

           int w = src.PixelWidth;

           int h = src.PixelHeight;

           WriteableBitmap neonImage =newWriteableBitmap(w, h);

           byte[] temp = src.PixelBuffer.ToArray();

           byte[] tempMask = (byte[])temp.Clone();

           int b = 0, g = 0, r = 0;

           for (int j = 1; j < h - 1; j++)

           {

               for (int i = 4; i < w * 4 - 4; i += 4)

               {

                   if (i == 0 || i == w - 4 || j == 0 || j == h - 1)

                   {

                       temp[i + j * w * 4] = (byte)0;

                       temp[i + 1 + j * w * 4] = (byte)0;

                       temp[i + 2 + j * w * 4] = (byte)0;

                   }

                   else

                   {

                       b = (int)Math.Sqrt((tempMask[i + j * w * 4] - tempMask[i + 4 + j * w * 4]) * (tempMask[i + j * w * 4] - tempMask[i + 4 + j * w * 4])

                           + (tempMask[i + j * w * 4] - tempMask[i + (j + 1) * w * 4]) * (tempMask[i + j * w * 4] - tempMask[i + (j + 1) * w * 4]));

                       g = (int)Math.Sqrt((tempMask[i + 1 + j * w * 4] - tempMask[i + 4 + 1 + j * w * 4]) * (tempMask[i + 1 + j * w * 4] - tempMask[i + 4 + 1 + j * w * 4])

                           + (tempMask[i + 1 + j * w * 4] - tempMask[i + 1 + (j + 1) * w * 4]) * (tempMask[i + 1 + j * w * 4] - tempMask[i + 1 + (j + 1) * w * 4]));

                       r = (int)Math.Sqrt((tempMask[i + 2 + j * w * 4] - tempMask[i + 4 + 2 + j * w * 4]) * (tempMask[i + 2 + j *w * 4] - tempMask[i + 4 + 2 + j * w * 4])

                           + (tempMask[i + 2 + j * w * 4] - tempMask[i + 2 + (j + 1) * w * 4]) * (tempMask[i + 2 + j * w * 4] - tempMask[i + 2 + (j + 1) * w * 4]));

                       temp[i + j * w * 4] = (byte)(b > 0 ? (b < 255 ? b : 255) : 0);

                       temp[i + 1 + j * w * 4] = (byte)(g > 0 ? (g < 255 ? g : 255) : 0);

                       temp[i + 2 + j * w * 4] = (byte)(r > 0 ? (r < 255 ? r : 255) : 0);

                   }

                   b = 0; g = 0; r = 0;

               }

           }

           Stream sTemp = neonImage.PixelBuffer.AsStream();

           sTemp.Seek(0,SeekOrigin.Begin);

           sTemp.Write(temp, 0, w * 4 * h);

           return neonImage;

           }

           else

           {

               returnnull;

           }  

       }

[图像效果]