Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people, just like you, are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
Solved

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

Posted on 2013-05-11
3
623 Views
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);

Open in new window

0
Comment
Question by:XGIS
  • 2
3 Comments
 
LVL 42

Accepted Solution

by:
sedgwick earned 500 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");
            }

Open in new window

0
 
LVL 7

Author Comment

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.
0
 
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
0

Featured Post

How our DevOps Teams Maximize Uptime

Our Dev teams are like yours. They’re continually cranking out code for new features/bugs fixes, testing, deploying, responding to production monitoring events and more. It’s complex. So, we thought you’d like to see what’s working for us. Read the use case whitepaper.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Introduction This article shows how to use the open source plupload control to upload multiple images. The images are resized on the client side before uploading and the upload is done in chunks. Background I had to provide a way for user…
This article shows how to deploy dynamic backgrounds to computers depending on the aspect ratio of display
Email security requires an ever evolving service that stays up to date with counter-evolving threats. The Email Laundry perform Research and Development to ensure their email security service evolves faster than cyber criminals. We apply our Threat…
In an interesting question (https://www.experts-exchange.com/questions/29008360/) here at Experts Exchange, a member asked how to split a single image into multiple images. The primary usage for this is to place many photographs on a flatbed scanner…

839 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question