NT JPEG metadata editor

Provides functions to parse/edit JPEG metadata (Exif) in C#

• No dependencies
• Works on UWP (Projects for Windows10)

• For WindowsPhone 8/8.1, See NtImageLib

• VisualStudio 2015 Community is required to run included tests.
• Supports geotagging to JPEG files

JPEG metadata (Exif and other) operator

Parser/Builder

JpegMetaDataParser parses metadata in JPEG image file simply. Both of byte array and byte stream are supported as input format. JpegMetaData structure may contains 3 sections(called IFD), Primary, Exif, and GPS. Each IFD has a dictionary of Entry with keys.

var Metadata = JpegMetaDataParser.ParseImage(image);

JpegMetaDataProcessor#SetMetaData function overwrites metadata to given image.

var metadata = JpegMetaDataParser.ParseImage(image);
// do something to the metadata
var newImage = JpegMetaDataProcessor.SetMetaData(image, metadata);

Add Geoposition to metadata

It has a simple method to add geotag from Geoposition

    Stream originalImage = getFromSomewhere();
    GeoPosition position = getFromSomeAPI();

    // Not to overwrite geotag. If already exists, an exception will be thrown
    Stream newImage = await MetaDataOperator.AddGeopositionAsync(originalImage, position);

    // to overwrite geotag
    Stream newImage = await MetaDataOperator.AddGeopositionAsync(originalImage, position, true);

Also you can add/update geotag manually same as other metadata sections.

// parse given image first
var exif = JpegMetaDataParser.ParseImage(image);

// check whether the image already contains GPS section or not
if (exif.IsGeotagExist)
{
	// You can throw excpetion
	throw new GpsInformationAlreadyExistsException("This image contains GPS information.");
}
// or overwrite section.

// Create IFD structure from given GPS info
var gpsIfdData = GpsIfdDataCreator.CreateGpsIfdData(position);

// Add GPS info to exif structure
exif.GpsIfd = gpsIfdData;

// create a new image with given location info
var newImage = JpegMetaDataProcessor.SetMetaData(image, exif);