' For complete examples and data files, please go to https://github.com/groupdocs-watermark/GroupDocs.Watermark-for-.NET
Using doc As WordsDocument = Document.Load(Of WordsDocument)("D:\test.docx")
Using watermark = New ImageWatermark("D:\logo.tif")
Dim effects As New WordsImageEffects()
effects.Brightness = 0.7
effects.Contrast = 0.6
effects.ChromaKey = Color.Red
effects.BorderLineFormat.Enabled = True
effects.BorderLineFormat.Weight = 1
doc.AddImageWatermark(watermark, effects)
End Using
doc.Save()
End Using