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);