C#读写BitMap及颜色相乘

C#读写BitMap及颜色相乘

  private Bitmap ReadBitMapAndMultipy(Bitmap bitmap0)
         {
             int x1width = bitmap0.Width;
             int y1height = bitmap0.Height;
             Bitmap image = new Bitmap(x1width, y1height,
                                          System.Drawing.Imaging.PixelFormat.Format32bppArgb);
             int iPixelSize = ;

             BitmapData bitmapdata = image.LockBits(new
                                     Rectangle(, , x1width, y1height),
                                     ImageLockMode.ReadWrite, image.PixelFormat);
             BitmapData bitmapdata0 = bitmap0.LockBits(new
                                      Rectangle(, , x1width, y1height),
                                      ImageLockMode.ReadOnly, image.PixelFormat);
             try
             {
                 unsafe
                 {
                     for (int y = ; y < y1height; y++)
                     {
                         byte* row = (byte*)bitmapdata.Scan0 +
                                     (y * bitmapdata.Stride);
                         byte* row0 = (byte*)bitmapdata0.Scan0 +
                                     (y * bitmapdata0.Stride);
                         for (int x = ; x < x1width; x++)
                         {
                             byte tempValB = row0[x * iPixelSize];
                             byte tempValG = row0[x * iPixelSize + ];
                             byte tempValR = row0[x * iPixelSize + ];
                             byte tempValA = row0[x * iPixelSize + ];
                             double r = Convert.ToDouble(tempValR) *  / ;
                             double g = Convert.ToDouble(tempValG) *  / ;
                             double b = Convert.ToDouble(tempValB) *  / ;

                             //double r = Convert.ToDouble(tempValR) * 78 / 255;
                             //double g = Convert.ToDouble(tempValG) * 69 / 255;
                             //double b = Convert.ToDouble(tempValB) * 48 / 255;
                             row[x * iPixelSize] = (byte)(b);
                             row[x * iPixelSize + ] = (byte)(g);
                             row[x * iPixelSize + ] = (byte)(r);
                             row[x * iPixelSize + ] = tempValA;
                         }
                     }

                 }
             }
             catch
             {
             }
             finally
             {
                 image.UnlockBits(bitmapdata);
             }
             return image;
         }

ReadBitMapAndMultipy

调用的代码：

 string path = System.IO.Path.GetDirectoryName(fileName);
 Image bitmap = pictureBox1.Image;
 Bitmap bitmap0 = bitmap as Bitmap;
 Bitmap sabe = ReadBitMapAndMultipy(bitmap0);
 Guid guid = new Guid();
 string file = string.Format(@"{0}\{1}.png", path, guid.ToString());
 sabe.Save(file);