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How Do I Prevent the Loss of EXIF Data when RESAMPLING a file with C# System.Drawing?

Posted on 2013-05-11
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Last Modified: 2013-09-05
When images are resampled in ASP.NET they lose their Original Date of Capture and other important EXIF data such as Latitude and Longitude. The images will inevitably be encoded to reduce filesize as well so any solutions need to consider this also. The SetPropertyItem is the one of interest. Is it also possible to use this method to extract the EXIF data values without using specific EXIF HEX code methods. Below is my basic code prior to processing;
 using (Bitmap originalImage = new Bitmap(file.InputStream))
            {

                Bitmap bitmapImage = ResizeImage(RadUpload1.UploadedFiles[0].InputStream);        
                
                //bitmapImage.SetPropertyItem(bitmapImage.PropertyItems[0]);

                System.IO.MemoryStream stream = new System.IO.MemoryStream();
                bitmapImage.Save(stream, System.Drawing.Imaging.ImageFormat.Jpeg);

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Question by:XGIS
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3 Comments
 
LVL 42

Accepted Solution

by:
Meir Rivkin earned 1500 total points
ID: 39159213
my solution for you would be to extracting the EXIT data before resampling the image and reset them again afterwards, since when loading the image to Bitmap u essentially losing the EXIT data.
check this code of extracting EXIT data from image:
http://www.codeproject.com/Articles/11305/EXIFextractor-library-to-extract-EXIF-information

here's a code usage:
            var imagefile = @"C:\Users\m.rivkin\Pictures\20130504_112103.jpg";
//extract all EXIF data before resizing image
            var props = EXIFextractor.GetExifProperties(imagefile);
            using (Bitmap originalImage = new Bitmap(imagefile))
            {
                Bitmap bmp = new Bitmap(originalImage.Width / 2, originalImage.Height / 2);
                
                using (Graphics g = Graphics.FromImage(bmp))
                {
                    g.DrawImage(originalImage, 0, 0, originalImage.Width / 2, originalImage.Height / 2);
                }

//set EXIF data back to modified image
                foreach (var item in props)
                {
                    bmp.SetPropertyItem(item);
                }

                bmp.Save(@"c:\temp\1.jpg");
            }

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by:XGIS
ID: 39166933
Thankyou for that i will check it out.  I did use a different exif class in a sample but it did not get lat longs. Hopefully this one will.
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LVL 7

Author Comment

by:XGIS
ID: 39386154
I may need to supply a code sample to further this one, as my integration has not worked yet
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