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C#操作彩色图像

原作者: [db:作者] 来自: [db:来源] 收藏 邀请
  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);


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