Convert byte [] of jp2 file to jpg

Question

I have a jp2 byte array, how can I convert it to a JPG file? thank you

Thanks to all the answers. I made some differences and almost succeeded. Here is how I do it:

 using (var reader = command.ExecuteReader()) { while (reader.Read()) { String id = (String)reader["ID"]; blob = (byte[])reader["Data"]; using (MemoryStream ms = new MemoryStream(blob)) { FIBITMAP dib = FreeImage.LoadFromStream(ms); if (dib.IsNull) { continue; } string jpgName = getJpgName(id); FreeImage.Save(FREE_IMAGE_FORMAT.FIF_JPEG, dib, jpgName, FREE_IMAGE_SAVE_FLAGS.JPEG_QUALITYNORMAL); } } } 

I read byte[] from the database. Now another problem arises; there is a memory leak! Can anyone choose it?

Answer 1

We have nothing built into .Net, but you can use FreeImage , which is a free library that can do this.

Here is an example of this .

 FIBITMAP dib = FreeImage.LoadEx("test.jp2"); //save the image out to disk FreeImage.Save(FREE_IMAGE_FORMAT.FIF_JPEG, dib, "test.jpg", FREE_IMAGE_SAVE_FLAGS.JPEG_QUALITYNORMAL); //or even turn it into a normal Bitmap for later use Bitmap bitmap = FreeImage.GetBitmap(dib); 

To convert from byte stream u, you can try the following:

 byte[] myByte = new byte[10]; MemoryStream theMemStream = new MemoryStream(); theMemStream.Write(myByte, 0, myByte.Length); FreeImageBitmap fbm = FreeImageBitmap.FromStream(theMemStream); fbm.Save("text.jpg",FREE_IMAGE_STREAM.FIF_JPEG);