作为性价比最高的图像处理控件，GdPicture.NET的优势不仅仅是体现在对于图形进行扫描，并能将图像转换为PDF和TIFF格式文件，并进行处理，比如为PDF和TIFF文件添加XMP注释。示例代码如下：

为PDF添加注释代码如下：

 Dim oGdPicturePDF As New GdPicturePDF

        If oGdPicturePDF.LoadFromFile("c:\test.pdf", False) = GdPictureStatus.OK Then
            Dim oAnnotationManager As AnnotationManager = New AnnotationManager
            If oAnnotationManager.InitFromGdPicturePDF(oGdPicturePDF) = GdPictureStatus.OK Then
                Dim annot As AnnotationStickyNote = oAnnotationManager.AddStickyNoteAnnot(0, 0, 3, 3, "To Be Investigated")
                annot.CanSelect = False
                annot.Author = "John"
                oAnnotationManager.BurnAnnotationsToPage(True) 'Comment this line to keep annots as XMP format
                oAnnotationManager.SaveDocumentToPDF("c:\testout.pdf")
                oAnnotationManager.Close()
            End If
            oGdPicturePDF.CloseDocument()
        End If

2 为TIFF等图像添加注释：

 Dim oGdPictureImaging As New GdPictureImaging
        Dim ImageID As Integer = oGdPictureImaging.CreateGdPictureImageFromFile("c:\001.tif")
        If oGdPictureImaging.GetStat = GdPictureStatus.OK Then
            Dim oAnnotationManager As AnnotationManager = New AnnotationManager
            If oAnnotationManager.InitFromGdPictureImage(ImageID) = GdPictureStatus.OK Then
                Dim annot As AnnotationStickyNote = oAnnotationManager.AddStickyNoteAnnot(0, 0, 3, 3, "To Be Investigated")
                annot.CanSelect = False
                annot.Author = "John"
                oAnnotationManager.BurnAnnotationsToPage(True) 'Comment this line to keep annots as XMP format
                oAnnotationManager.SaveDocumentToTIFF("c:\testout.tif", TiffCompression.TiffCompressionAUTO)
                oAnnotationManager.Close()
            End If
            oGdPictureImaging.ReleaseGdPictureImage(ImageID)
        End If