--- title: "Converting a PDF to a TIFF using color detection in VB.NET" canonical_url: "https://www.nutrient.io/guides/dotnet/samples/pdf-to-tiff-color-detection-vbnet/" md_url: "https://www.nutrient.io/guides/dotnet/samples/pdf-to-tiff-color-detection-vbnet.md" last_updated: "2026-05-14T21:57:26.876Z" description: "Learn to convert PDFs to multipage TIFFs using a color detection plugin. Achieve high-quality output with minimal file size for efficient storage." --- # Converting a multipage PDF to a multipage TIFF using color detection in VB.NET This example shows how to convert an existing PDF document to a multipage TIFF file using the color detection plugin to produce the best quality output while keeping the output file size as low as possible. [Get Started](https://www.nutrient.io/sdk/dotnet/getting-started.md) [All Samples](https://www.nutrient.io/guides/dotnet/samples.md) [Download](https://www.nutrient.io/guides/dotnet/downloads.md) [Launch Demo](https://www.nutrient.io/demo/) --- ### C# [C#](https://www.nutrient.io/guides/dotnet/samples/pdf-to-tiff-color-detection-cs.md) ### VB.NET [VB.NET](https://www.nutrient.io/guides/dotnet/samples/pdf-to-tiff-color-detection-vbnet.md) ```vb 'We assume that GdPicture has been correctly installed and unlocked. Const INPUT_DOCUMENT As String = "input.pdf" Const OUTPUT_DOCUMENT As String = "output.tif" Const DPI As Single = 200F Dim oGdPicturePDF As New GdPicturePDF() Dim oGdPictureImaging As New GdPictureImaging() If oGdPicturePDF.LoadFromFile(INPUT_DOCUMENT, False) = GdPictureStatus.OK Then Dim tiffID As Integer = 0 For i As Integer = 0 To oGdPicturePDF.GetPageCount() - 1 oGdPicturePDF.SelectPage(i + 1) 'Rasterizing a page or extracting a page bitmap. Dim rasterPage As Integer = oGdPicturePDF.RenderPageToGdPictureImageEx(DPI, True, System.Drawing.Imaging.PixelFormat.Format24bppRgb) If oGdPicturePDF.GetStat() = GdPictureStatus.OK Then 'Defining the compression of the tiff page. Let's use CCITT4 for bitonal pages and JPEG for others. Dim tiffCompression As TiffCompression 'Applying color detection and color depth automatic conversion. oGdPictureImaging.ColorDetection(rasterPage, True, False, False) If oGdPictureImaging.GetBitDepth(rasterPage) = 1 Then tiffCompression = TiffCompression.TiffCompressionCCITT4 Else tiffCompression = TiffCompression.TiffCompressionJPEG End If If i = 0 Then If oGdPictureImaging.TiffSaveAsMultiPageFile(rasterPage, OUTPUT_DOCUMENT, tiffCompression) = GdPictureStatus.OK Then 'Firstly rasterized page's GdPicture ID becomes the multipage tiff id. tiffID = rasterPage Else MessageBox.Show("Error occurred when saving the file. Status: " + oGdPictureImaging.GetStat().ToString(), "Color Detection Example", MessageBoxButtons.OK, MessageBoxIcon.Error) Exit For End If Else If oGdPictureImaging.TiffAddToMultiPageFile(tiffID, rasterPage, tiffCompression) <> GdPictureStatus.OK Then MessageBox.Show("Error occurred when adding a page. Status: " + oGdPictureImaging.GetStat().ToString(), "Color Detection Example", MessageBoxButtons.OK, MessageBoxIcon.Error) Exit For End If oGdPictureImaging.ReleaseGdPictureImage(rasterPage) End If Else MessageBox.Show("Error occurred when rendering the page. Status: " + oGdPicturePDF.GetStat().ToString(), "Color Detection Example", MessageBoxButtons.OK, MessageBoxIcon.Error) End If Next oGdPictureImaging.TiffCloseMultiPageFile(tiffID) oGdPictureImaging.ReleaseGdPictureImage(tiffID) Else MessageBox.Show("The file can't be opened. Status: " + oGdPicturePDF.GetStat().ToString(), "Color Detection Example", MessageBoxButtons.OK, MessageBoxIcon.Error) End If oGdPicturePDF.Dispose() oGdPictureImaging.Dispose() ``` This code sample is an example that illustrates how to use our SDK. Please adapt it to your specific use case. --- ## Related pages - [Automatically rotate pages of a multipage TIFF file using OCR and VB.NET](/guides/dotnet/samples/auto-rotate-tiff-vbnet.md) - [Automatically rotate pages of a multipage TIFF file using OCR and C#](/guides/dotnet/samples/auto-rotate-tiff-cs.md) - [Convert PDFs, MS Office, and images to TIFF in C#](/guides/dotnet/samples/convert-to-tiff-cs.md) - [Saving images into folders based on their barcode](/guides/dotnet/samples/barcode-auto-sorting-cs.md) - [Saving images into folders based on their barcode](/guides/dotnet/samples/barcode-auto-sorting-vbnet.md) - [Generate a multipage TIFF file using a compression mode per page in C#](/guides/dotnet/samples/create-multipage-tiff-cs.md) - [Converting a Microsoft Word binary file document (DOC) to a Microsoft Word OpenXML document (DOCX) in C#](/guides/dotnet/samples/doc-to-docx-cs.md) - [Merging two PDF documents by alternating pages from both files in VB.NET](/guides/dotnet/samples/merge-pdf-alternate-pages-vbnet.md) - [Using an external OCR engine during PDF/OCR generation](/guides/dotnet/samples/integrate-omnipage-ocr-cs.md) - [Converting a multipage PDF to a multipage TIFF using color detection in C#](/guides/dotnet/samples/pdf-to-tiff-color-detection-cs.md) - [Merging two PDF documents by alternating pages from both files in C#](/guides/dotnet/samples/merge-pdf-alternate-pages-cs.md) - [Recompress existing PDFs using MRC compression in C#](/guides/dotnet/samples/recompress-pdf-mrc-cs.md) - [Recompress an existing PDF using color detection in VB.NET](/guides/dotnet/samples/recompress-pdf-vbnet.md) - [Recompress an existing PDF using color detection in C#](/guides/dotnet/samples/recompress-pdf-cs.md) - [Recompress existing PDFs using MRC compression in VB.NET](/guides/dotnet/samples/recompress-pdf-mrc-vbnet.md) - [Highlight and crop an image in C#](/guides/dotnet/samples/select-image-crop-area-cs.md) - [Highlight and crop an image in VB.NET](/guides/dotnet/samples/select-image-crop-area-vbnet.md) - [Highlight a region in PDF or an image in VB.NET](/guides/dotnet/samples/select-pdf-image-region-vbnet.md) - [Choosing the appropriate OCR zone in C#](/guides/dotnet/samples/select-ocr-zone-cs.md) - [Highlight a region in a PDF or an image in C#](/guides/dotnet/samples/select-pdf-image-region-cs.md) - [Choosing the appropriate OCR zone in VB.NET](/guides/dotnet/samples/select-ocr-zone-vbnet.md) - [Save bitonal TIFFs with VB.NET using photometric 0](/guides/dotnet/samples/tiff-photometric-vbnet.md) - [Convert a multipage TIFF to a multipage JBIG2 in VB.NET](/guides/dotnet/samples/tiff-to-jbig2-vbnet.md) - [Save bitonal TIFF images with C# and CCITT4](/guides/dotnet/samples/tiff-photometric-cs.md) - [Convert a multipage TIFF to a multipage JBIG2 in C#](/guides/dotnet/samples/tiff-to-jbig2-cs.md)