Thumbnail not correctly stored by Microsoft JPEG Encoder

This issue has been moved from a ticket on Developer Community.

Saving an Image by the Microsoft JPEG Encoder stores the Thumbnail incorrectly (APP1 Exif Entry).

Wrong produced by JPEG Encoder (JPEG Image File):

FF D8 FF E0 00 10 4A 46 49 46 00 01 01 01 00 60 00 60 00 00 FF E1 0C 40 45 78 69 66 00 00 4D 4D 00 2A 00 00 00 08 00 00 00 00 00 0E 00 06 01 03 00 03 00 00 00 01 00 06 00 00 01 1A 00 05 00 00 00 01 00 00 00 5C 01 1B 00 05 00 00 00 01 00 00 00 64 01 28 00 03 00 00 00 01 00 02 00 00 02 01 00 04 00 00 00 01 00 00 00 6C 02 02 00 04 00 00 00 01 00 00 0B CC 00 00 00 00 00 00 00 60 00 00 00 01 00 00 00 60 00 00 00 01 FF D8 FF DB 00 43 ... The TIFF tag countfield 000E should be at address X'26" instead of X'2A'

Preceding image was produced by following program:

Private Sub Button_Click(sender As Object, e As RoutedEventArgs) Dim file1 As String Dim file2 As String Dim dec1 As BitmapDecoder Dim enc1 As JpegBitmapEncoder Dim stream1 As System.IO.FileStream Dim stream2 As System.IO.FileStream Dim bmp1 As BitmapSource Dim bmp2 As BitmapSource ' Thumbnail Dim transform1 As ScaleTransform Dim frame1 As BitmapFrame

file1 = "d:\testfiles\jpeg\MM Jpeg.jpg" stream1 = New System.IO.FileStream(file1, IO. FileMode.Open, IO. FileAccess.Read) dec1 = BitmapDecoder.Create(stream1, Nothing, Nothing) bmp1 = dec1. Frames(0)

transform1 = New ScaleTransform transform1. ScaleX = 0.125 transform1. ScaleY = 0.125 bmp2 = New TransformedBitmap(bmp1, transform1)

enc1 = New JpegBitmapEncoder enc1. QualityLevel = 75

file2 = "d:\temp\MM JPEG created by JPEGencoder.jpg" stream2 = New System.IO.FileStream(file2, IO. FileMode.Create, IO. FileAccess.Write) frame1 = BitmapFrame.Create(bmp1, bmp2, Nothing, Nothing) enc1. Frames.Add(frame1) enc1. Save(stream2) stream2. Close()

End Sub

Correct example:

FF D8 FF E0 00 10 4A 46 49 46 00 01 02 01 00 60 00 60 00 00 FF E1 0D CC 45 78 69 66 00 00 4D 4D 00 2A 00 00 00 08 00 07 01 12 00 03 00 00 00 01 00 01 00 00 01 1A 00 05 00 00 00 01 00 00 00 62 01 1B 00 05 00 00 00 01 00 00 00 6A 01 28 00 03 00 00 00 01 00 02 00 00 01 31 00 02 00 00 00 1B 00 00 00 72 01 32 00 02 00 00 00 14 00 00 00 8D 87 69 00 04 00 00 00 01 00 00 00 A4 00 00 00 D0 00 00 00 60 00 00 00 01 00 00 00 60 00 00 00 01 41 64 6F 62 65 20 50 68 6F 74 6F 73 68 6F 70 20 43 53 20 57 69 6E 64 6F 77 73 00 32 30 30 35 3A 31 31 3A 31 35 20 30 30 3A 31 32 3A 32 37 00 00 00 00 00 03 A0 01 00 03 00 00 00 01 FF FF 00 00 ...