ImageResourcePackage

public ImageResourcePackage ImageResourcePackage { get; }

using (Metadata metadata = new Metadata(Constants.PsdWithIrb))
{
    var root = metadata.GetRootPackage<PsdRootPackage>();

    if (root.ImageResourcePackage != null)
    {
        foreach (var block in root.ImageResourcePackage.ToList())
        {
            Console.WriteLine(block.Signature);
            Console.WriteLine(block.ID);
            Console.WriteLine(block.Name);
            Console.WriteLine(block.Data);
        }
    }
}