private void button1_Click( object sender, EventArgs e)
{
Bitmap b = pictureBox1.Image as Bitmap;

int width = b.Width;
int height = b.Height;
BitmapData bd = b.LockBits ( new Rectangle( 0, 0, width, height), ImageLockMode.ReadOnly, PixelFormat.Format24bppRgb );
IntPtr imgPtr = bd.Scan0;
int stride = bd.Stride;
int widthByte = width*3;
int skipByte = stride - widthByte;
int [,,] rgbData = new int [width,height,3 ];
#region 讀取 RGB 資料
unsafe
{
byte* p = ( byte*) ( void*) imgPtr;
for ( int j = 0; j < height; j++)
{
for ( int i = 0; i < width; i++)
{
rgbData[i, j, 2 ] = p[ 0 ];
p++;
rgbData[i, j, 0 ] = p[ 0 ];
p++;
rgbData[i, j, 1 ] = p[ 0 ];
p++;
}
p += skipByte;
}
}
#endregion