--- title: "Highlight and crop an image in C# (JPG, TIFF, PNG)" canonical_url: "https://www.nutrient.io/guides/dotnet/samples/select-image-crop-area-cs/" md_url: "https://www.nutrient.io/guides/dotnet/samples/select-image-crop-area-cs.md" last_updated: "2026-05-21T17:12:02.215Z" description: "Learn how to capture and create images from highlighted areas in GdViewer using C#. Explore this practical example to enhance your document handling skills." --- # Highlight and crop an image in C# This example shows how to create an image from the area defined by a highlighted region located on top of a document displayed within the `GdViewer` object. Highlighted regions can be used to specify areas and highlight them using only the mouse. [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/select-image-crop-area-cs.md) ### VB.NET [VB.NET](https://www.nutrient.io/guides/dotnet/samples/select-image-crop-area-vbnet.md) ```cs //We assume that GdPicture has been correctly installed and unlocked. //We assume the GdViewer object called GdViewer1 has been created and painted on the form. GdPictureImaging oGdPictureImaging = new GdPictureImaging(); //Loading the image from a file. int currentImageID = oGdPictureImaging.CreateGdPictureImageFromFile("C:\\Image.tif"); //Checking if the image resource has been loaded correctly. if (oGdPictureImaging.GetStat()!= GdPictureStatus.OK) { MessageBox.Show("The image can't be loaded. Error: " + oGdPictureImaging.GetStat().ToString(), "Drawing regions Example", MessageBoxButtons.OK, MessageBoxIcon.Error); } else { //Displaying the image in the GdViewer. GdViewer1.DisplayFromGdPictureImage(currentImageID); } //We will keep the current image for further use, see below. int selectedImageID = 0; //A new image we are going to create. //On the Mouse UP event on the GdViewer, get a highlighted region coordinates based on the rectangle of selection of the GdViewer. //If no rectangle of selection is painted on the GdViewer, this event will do nothing. public void Mouse_UP_Draw_Region(System.Object eventSender, System.EventArgs eventArgs) { //Initializing variables to hold the position of the rectangle of selection on the document. int leftArea = 0; int topArea = 0; int widthArea = 0; int heightArea = 0; //Checking if a rectangle of selection has been painted on the GdViewer. if (GdViewer1.IsRect()) { //Getting the location of the selection on the document. GdViewer1.GetRectCoordinatesOnDocument(ref leftArea, ref topArea, ref widthArea, ref heightArea); //Creating the image from the highlighted region. selectedImageID = oGdPictureImaging.CreateClonedGdPictureImageArea(currentImageID, leftArea, topArea, widthArea, heightArea); GdViewer1.DisplayFromGdPictureImage(selectedImageID); } } // Do not forget to release and dispose both images! oGdPictureImaging.ReleaseGdPictureImage(currentImageID); oGdPictureImaging.ReleaseGdPictureImage(selectedImageID); 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 - [Saving images into folders based on their barcode](/guides/dotnet/samples/barcode-auto-sorting-vbnet.md) - [Automatically rotate pages of a multipage TIFF file using OCR and C#](/guides/dotnet/samples/auto-rotate-tiff-cs.md) - [Generate a multipage TIFF file using a compression mode per page in C#](/guides/dotnet/samples/create-multipage-tiff-cs.md) - [Automatically rotate pages of a multipage TIFF file using OCR and VB.NET](/guides/dotnet/samples/auto-rotate-tiff-vbnet.md) - [Saving images into folders based on their barcode](/guides/dotnet/samples/barcode-auto-sorting-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) - [Convert PDFs, MS Office, and images to TIFF in C#](/guides/dotnet/samples/convert-to-tiff-cs.md) - [Using an external OCR engine during PDF/OCR generation](/guides/dotnet/samples/integrate-omnipage-ocr-cs.md) - [Merging two PDF documents by alternating pages from both files in C#](/guides/dotnet/samples/merge-pdf-alternate-pages-cs.md) - [Merging two PDF documents by alternating pages from both files in VB.NET](/guides/dotnet/samples/merge-pdf-alternate-pages-vbnet.md) - [Recompress an existing PDF using color detection in C#](/guides/dotnet/samples/recompress-pdf-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) - [Converting a multipage PDF to a multipage TIFF using color detection in VB.NET](/guides/dotnet/samples/pdf-to-tiff-color-detection-vbnet.md) - [Recompress existing PDFs using MRC compression in C#](/guides/dotnet/samples/recompress-pdf-mrc-cs.md) - [Recompress existing PDFs using MRC compression in VB.NET](/guides/dotnet/samples/recompress-pdf-mrc-vbnet.md) - [Recompress an existing PDF using color detection in VB.NET](/guides/dotnet/samples/recompress-pdf-vbnet.md) - [Highlight and crop an image in VB.NET](/guides/dotnet/samples/select-image-crop-area-vbnet.md) - [Highlight a region in a PDF or an image in C#](/guides/dotnet/samples/select-pdf-image-region-cs.md) - [Highlight a region in PDF or an image in VB.NET](/guides/dotnet/samples/select-pdf-image-region-vbnet.md) - [Save bitonal TIFFs with VB.NET using photometric 0](/guides/dotnet/samples/tiff-photometric-vbnet.md) - [Choosing the appropriate OCR zone in C#](/guides/dotnet/samples/select-ocr-zone-cs.md) - [Save bitonal TIFF images with C# and CCITT4](/guides/dotnet/samples/tiff-photometric-cs.md) - [Choosing the appropriate OCR zone in VB.NET](/guides/dotnet/samples/select-ocr-zone-vbnet.md) - [Convert a multipage TIFF to a multipage JBIG2 in C#](/guides/dotnet/samples/tiff-to-jbig2-cs.md) - [Convert a multipage TIFF to a multipage JBIG2 in VB.NET](/guides/dotnet/samples/tiff-to-jbig2-vbnet.md)