How to add custom data to jpeg

Aspose.Imaging Product Family
1

I am loading a jpeg and I need to save & read a few custom properties from the image file so I know what image processing I did on the image. The values should be saved to the jpeg file and when read later should be available. looking on the available options, I see EXIF does not let me add custom data (I do not want to use something existing because it might be in use by the jpeg creator and I need to preserve existing exif data), I have also looked at XMP data and saw that I could probably add some package but I could not find any sample on how to do that.

Any advice on how to achieve this? I am using .NET version of imaging

4

Hi @DanAvni
I will send you examples soon

5

@DanAvni
You your purposes you can use

  1. ExifData.MakerNoteRawData - just write a byte array to the tail of the available data, at the beginning and end of which there will be some kind of marker to understand that this is your data
    , then you can read the last bytes and determine the presence of your marker in the file
  2. XmpData
using (Image image = Image.Load("test.jpg"))
{
	XmpPacketWrapper wrapper = null;
	if (image is IHasXmpData)
	{
		wrapper = ((IHasXmpData)image).XmpData;
	}

	if (wrapper == null)
	{
		wrapper = new XmpPacketWrapper();
	}
	
        // Your website with a description of XMP data may be fake
	string yourUrlWithDescription = "http://yoursite.com/DanAvni/elements/1/";
       // Your own prefix for each value you use in your package
	string yourOwnPrefix = "DanAvni";

	XmpPackage myPackage = wrapper.GetPackage(yourUrlWithDescription);
	if (myPackage == null)
	{
		myPackage = new XmpPackage(yourOwnPrefix, yourUrlWithDescription);
		wrapper.AddPackage(myPackage);
	}
	// You MUST set your values with names like "{yourOwnPrefix}:{varName}"
	myPackage[yourOwnPrefix + ":MyCustomValue"] = "My simple data";
	JpegOptions opt = new JpegOptions();
	opt.XmpData = wrapper;
	image.Save("test-add.jpg", opt);
}

Hope, it will help