Thumbnail Generation

[mo]

Hi,
I have the following code to create a thumbnail from the input stream

System.Drawing. Image source;
source=System.D rawing.Image.Fr omStream(new
System.IO.Memor yStream(myData) );
System.Drawing. Image image = source.GetThumb nailImage
150,150,null,In tPtr.Zero);
MemoryStream ms = new MemoryStream();
ImageFormat thisformat=imag e.RawFormat;
Bitmap imagebitmap = new Bitmap(image,15 0,150);
imagebitmap.Sav e(ms,thisformat );
ms.Seek(0,SeekO rigin.Begin);
byte[] SmallmyData = new byte[ms.Length];
FileStream newFile = new FileStream(strP ath, FileMode.Create );
newFile.Write(B uffer, 0, SmallmyData.Len gth);
newFile.Close() ;

Two problems I have
1) imagebitmap.Sav e(ms,thisformat ); line faults and cannot find the
value for thisformat (It works if I replace it with ImageFormat.Jpe g)
2) the file that gets created is corrupt.

ANy help is greatly appreciated.

Thanks,
Mo

[Rick Strahl [MVP]]

Try this code:

http://west-wind.com/weblog/posts/283.aspx

and

http://west-wind.com/weblog/posts/626.aspx
In addition to working <g>, the above code doesn't use GetThumbnailIma ge
which generally does a pretty poor job of creating thumbnails. The second
post talks about adding a switch for the InterpolationMo de to further
enhance image quality of a resized image.

Regards,

+++ Rick ---

--

Rick Strahl
West Wind Technologies
http://www.west-wind.com/
http://www.west-wind.com/weblog/
http://www.west-wind.com/wwThreads/
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"mo" <le******@yahoo .com> wrote in message
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Hi,
I have the following code to create a thumbnail from the input stream

System.Drawing. Image source;
source=System.D rawing.Image.Fr omStream(new
System.IO.Memor yStream(myData) );
System.Drawing. Image image = source.GetThumb nailImage
150,150,null,In tPtr.Zero);
MemoryStream ms = new MemoryStream();
ImageFormat thisformat=imag e.RawFormat;
Bitmap imagebitmap = new Bitmap(image,15 0,150);
imagebitmap.Sav e(ms,thisformat );
ms.Seek(0,SeekO rigin.Begin);
byte[] SmallmyData = new byte[ms.Length];
FileStream newFile = new FileStream(strP ath, FileMode.Create );
newFile.Write(B uffer, 0, SmallmyData.Len gth);
newFile.Close() ;

Two problems I have
1) imagebitmap.Sav e(ms,thisformat ); line faults and cannot find the
value for thisformat (It works if I replace it with ImageFormat.Jpe g)
2) the file that gets created is corrupt.

ANy help is greatly appreciated.

Thanks,
Mo