Question

Are there any good .net libraries I can use to read and write tags, people tags, date take, et cetera that are compatible with Windows Live Photo Gallery?

Answer 1

FotoFly available on CodePlex is a C# library and it supports Windows Live Faces, GPS, Keywords, etc.. just as you are asking. See http://fotofly.codeplex.com/

Just an example using FotoFly to do what you want:

  JpgPhoto photo = new JpgPhoto(@"c:\temp\file.jpg");
  photo.ReadMetadata();

  photo.Metadata.RegionInfo.Regions.Clear();

  XmpRegion xmp = new XmpRegion();
  xmp.PersonDisplayName = "esac";
  xmp.RectangleString = "0.11, 0.25, 0.37, 0.49";

  photo.Metadata.RegionInfo.Regions.Add(xmp);
  photo.WriteMetadata();

It also supports Exif, Iptc, Xmp, GPS, etc..