Photo Gallery gives you the ability to mark a person's face and apply a tag to it. I understand it inserts tags directly into the file rather than store it off in a database or accompanying metafile anywhere.
So if that's true, what data is it inserting and how is it formatted?
Here's the code I wanted. It's in C#.
public void ReadWLPGRegions(string sourceFile)
{
string microsoftRegions = @"/xmp/RegionInfo/Regions";
string microsoftPersonDisplayName = @"/PersonDisplayName";
string microsoftRectangle = @"/Rectangle";
BitmapCreateOptions createOptions = BitmapCreateOptions.PreservePixelFormat | BitmapCreateOptions.IgnoreColorProfile;
using (Stream sourceStream = File.Open(sourceFile, FileMode.Open, FileAccess.Read))
{
BitmapDecoder sourceDecoder = BitmapDecoder.Create(sourceStream, createOptions, BitmapCacheOption.None);
// Check source has valid frames
if (sourceDecoder.Frames[0] != null && sourceDecoder.Frames[0].Metadata != null)
{
BitmapMetadata sourceMetadata = sourceDecoder.Frames[0].Metadata as BitmapMetadata;
// Check there is a RegionInfo
if (sourceMetadata.ContainsQuery(microsoftRegions))
{
BitmapMetadata regionsMetadata = sourceMetadata.GetQuery(microsoftRegions) as BitmapMetadata;
// Loop through each Region
foreach (string regionQuery in regionsMetadata)
{
string regionFullQuery = microsoftRegions + regionQuery;
// Query for all the data for this region
BitmapMetadata regionMetadata = sourceMetadata.GetQuery(regionFullQuery) as BitmapMetadata;
if (regionMetadata != null)
{
if (regionMetadata.ContainsQuery(microsoftPersonDisplayName) &&
regionMetadata.ContainsQuery(microsoftRectangle))
{
Console.Writeline( regionMetadata.GetQuery(microsoftRectangle).ToString()));
Console.WriteLine(regionMetadata.GetQuery(microsoftPersonDisplayName).ToString()));
}
}
}
}
}
}
}
When possible, Windows Live Photo Gallery uses XMP to write metadata to picture files. See Metadata and the Windows Vista Photo Gallery for details.
