C# 操作 彩色图像

1. C# 操作 彩色图像
   2007-11-14 08:42

   //throw new System.NotImplementedException();
               string strLoad = @"C:\VectorQuantization\TrainingImages\RGB\1.bmp";
               string strR = @"C:\Red.bmp";
               string strG = @"C:\Green.bmp";
               string strB = @"C:\Blue.bmp";           
               // Create a new bitmap.
               Bitmap bmp = new Bitmap(strLoad);
               Bitmap bmpR = new Bitmap(bmp);
               Bitmap bmpG = new Bitmap(bmp);
               Bitmap bmpB = new Bitmap(bmp);

               // Lock the bitmap's bits.
               Rectangle rect = new Rectangle(0, 0, bmp.Width, bmp.Height);
               //24bppRGB
               System.Drawing.Imaging.BitmapData bmpData =
                   bmpR.LockBits(rect, System.Drawing.Imaging.ImageLockMode.ReadWrite,
                   PixelFormat.Format24bppRgb);

               //32bppArgb
               //System.Drawing.Imaging.BitmapData bmpData =
               //    bmpR.LockBits(rect, System.Drawing.Imaging.ImageLockMode.ReadWrite,
               //    PixelFormat.Format32bppArgb);

               // Get the address of the first line.
               IntPtr ptr = bmpData.Scan0;

               // Declare an array to hold the bytes of the bitmap.
               int bytes = bmpData.Stride * bmp.Height;
               byte[] rgbValues = new byte[bytes];

               // Copy the RGB values into the array.
               System.Runtime.InteropServices.Marshal.Copy(ptr, rgbValues, 0, bytes);

               if (bmpData.PixelFormat == PixelFormat.Format24bppRgb)
               {
                   // Keep every third value. A 24bpp bitmap will look only red.
                   for (int counter = 0; counter < rgbValues.Length; counter += 3)
                   {
                       //rgbValues[counter] = 255;//Blue
                       //rgbValues[counter + 1] = 255;//Green
                       //rgbValues[counter + 2] = 255;//Red
                   }
               }

               if (bmpData.PixelFormat == PixelFormat.Format32bppArgb)
               {
                   // Keep every third value. A 24bpp bitmap will look only red.
                   for (int counter = 0; counter < rgbValues.Length; counter += 4)
                   {
                       //rgbValues[counter] = 255;//Blue
                       //rgbValues[counter + 1] = 255;//Green
                       //rgbValues[counter + 2] = 255;//Red
                       rgbValues[counter + 3] = 255;//A
                   }
               }

   
               // Copy the RGB values back to the bitmap
               System.Runtime.InteropServices.Marshal.Copy(rgbValues, 0, ptr, bytes);

               // Unlock the bits.
               bmpR.UnlockBits(bmpData);

               // Save the R Image
               bmpR.Save(strR);