C# 開啟Raw檔案

朋友問raw格式的影像該怎麼用程式show出來看?
因為是影像處理的入門問題，所以當然不能先透過影像處理軟體處理好再丟到程式裡面show出來，剛剛完成，就把重點節錄下來。
重點是Bitmap的圖示矩陣式的，而Raw是線性的的正矩形圖片，長、寬要自己利用開更號方式計算，再一個像素一個像素塞回去。

private void button1_Click(object sender, System.EventArgs e)

{

int rawSize;

Bitmap bm;

openFileDialog1.Filter = "RAW files (*.raw)|*.raw|BMP files (*.bmp)|*.bmp|JPEG files (*.jpg)|*.jpg|TIFF files (*.tif)|*.tif";

if (openFileDialog1.ShowDialog()==DialogResult.OK)

{

if (openFileDialog1.FileName.Substring(openFileDialog1.FileName.Length-3,3) =="raw")

{

FileStream infile = File.Open(openFileDialog1.FileName, FileMode.Open,FileAccess.Read, FileShare.Read);

this.textBox1.Text = openFileDialog1.FileName;

rawSize = (int)Math.Sqrt(infile.Length);

bm = new Bitmap(rawSize,rawSize);

BinaryReader tmpBReader = new BinaryReader(infile);

byte buff;

for (int i=0; i < rawSize; i++ )

{

for (int j=0; j < rawSize; j++ )

{

buff = tmpBReader.ReadByte();

bm.SetPixel(j,i,Color.FromArgb(buff,buff,buff));

}

}

tmpBReader.Close();

}

else

{

bm = new Bitmap(openFileDialog1.FileName);

this.textBox1.Text = openFileDialog1.FileName;

}

pictureBox1.Image = bm;

}

}