Writing Thumbnails - Githubissues

* Posted by JochenK on CP *

I need create and write the Thumbnail to exif if no Thumbnail is included, 
and i'm confused after a few hours...i think i did something wrong, maybe 
you can help me.

I did this:

//Reading the source-file and the Thumbnail
ExifLibrary.ExifFile file = ExifLibrary.ExifFile.Read(filename);
ExifLibrary.JPEGFile tFile = file.Thumbnail;
//Check if a Thumbnail is already included. If not: create one and add...
if (tFile == null)
{
  //Create a new Bitmap from the source-File and scale it to 160Pixels 
(largest side)
  Image img = new Bitmap(filename);
  img = Tools.PictureTools.Resize((Bitmap)img, 160);
  //Save the smaller Bitmap as a jpg
  img.Save(@"D:\temp\testexifthumbnail.jpg", ImageFormat.Jpeg);
  //assign the jpg to the thumbnail. ...
  file.Thumbnail = new 
ExifLibrary.JPEGFile(@"D:\temp\testexifthumbnail.jpg");
  //...and save the modified source-file
  file.Save(filename + ".modified.jpg");
}

At first, everything seemes to work fine: the modified file ist about the 
size of the created thumbnail larger. But if i read the modified file 
again, no thumbnail can be exctracted.

Original issue reported on code.google.com by oozcitak on 6 Feb 2010 at 10:24

goldengel / exiflibrary

Writing Thumbnails #16