彩票走势图

使用GdPicture.NET可对图像扫描后进行简单的处理，比如将PDF文件转换成多页的TIFF文件，本文将给出该示例的代码。

》》》下载GdPicture.NET最新试用版

示例代码如下：

  
      Dim oGdPictureImaging As New GdPictureImaging()
      Dim oGdPicturePDF As New GdPicturePDF


      If oGdPicturePDF.LoadFromFile("c:\test.pdf", False) = GdPictureStatus.OK Then
         Dim TiffID As Integer
         For i As Integer = 1 To oGdPicturePDF.GetPageCount()
            oGdPicturePDF.SelectPage(i)
            Dim RasterPageID As Integer = oGdPicturePDF.RenderPageToGdPictureImageEx(200, True) '200 DPI rendering with form fields, or native image extraction if the page is image based
            'Convert rendered page to bitonal
            oGdPictureImaging.ConvertTo1Bpp(RasterPageID) 'Remove this line if you want to obtain colour tiff image
            If i = 1 Then
               TiffID = RasterPageID
               oGdPictureImaging.TiffSaveAsMultiPageFile(TiffID, "c:\multipage.tif", TiffCompression.TiffCompressionAUTO)
            Else
               oGdPictureImaging.TiffAddToMultiPageFile(TiffID, RasterPageID)
            End If
            oGdPictureImaging.ReleaseGdPictureImage(RasterPageID)
         Next
         oGdPictureImaging.TiffCloseMultiPageFile(TiffID)
         oGdPicturePDF.CloseDocument()
         MsgBox("Done!")
      Else
         MsgBox("can't open PDF")
      End If