RegionReplacementOptions

public class RegionReplacementOptions

    using (Redactor redactor = new Redactor("D:\\test.jpg"))
    {
       System.Drawing.Point samplePoint = new System.Drawing.Point(516, 311);
       System.Drawing.Size sampleSize = new System.Drawing.Size(170, 35);
       RedactorChangeLog result = redactor.Apply(new ImageAreaRedaction(samplePoint,
                     new RegionReplacementOptions(System.Drawing.Color.Blue, sampleSize)));
       if (result.Status != RedactionStatus.Failed)
       {
          redactor.Save();
       };
    }