IronOCR How-Tos Fix Image Orientation How to Fix Image Orientation for Reading Chaknith Bin Updated:June 22, 2025 Fixing image orientation, in the context of image processing, involves making adjustments to an image to ensure it is properly aligned for specific purposes, such as text recognition. IronOcr supports fixing image orientation, including rotation, deskewing, and scaling. These techniques are essential for preparing images for accurate text recognition, as they ensure that text is correctly oriented, aligned, and appropriately sized for extraction. Get started with IronOCR Start using IronOCR in your project today with a free trial. First Step: Start for Free How to Fix Image Orientation for Reading Download a C# library to fix image orientation Import the PDF document and images for reading Apply desired orientation correction, such as rotation, deskew, and scale Export the corrected image for viewing Utilize the Read method for OCR processing Rotate Image Example Rotating an image involves changing its orientation by a specific angle (e.g., 90 degrees clockwise or counterclockwise) to ensure that the text or content within the image is upright and correctly aligned. Pass a degree value to the Rotate method to perform the rotation. A positive degree value will rotate the image clockwise, while a negative degree value will rotate the image counterclockwise. :path=/static-assets/ocr/content-code-examples/how-to/image-orientation-correction-rotate-image.cs using IronOcr; // Instantiate IronTesseract IronTesseract ocrTesseract = new IronTesseract(); // Add image using var imageInput = new OcrImageInput("paragraph_skewed.png"); // Rotate the image 180 degrees clockwise imageInput.Rotate(180); // Export the modified image imageInput.SaveAsImages("rotate"); Imports IronOcr ' Instantiate IronTesseract Private ocrTesseract As New IronTesseract() ' Add image Private imageInput = New OcrImageInput("paragraph_skewed.png") ' Rotate the image 180 degrees clockwise imageInput.Rotate(180) ' Export the modified image imageInput.SaveAsImages("rotate") $vbLabelText $csharpLabel For convenience, you can export the modified image using the SaveAsImages method. Below is a comparison of the image before and after rotation. Before After Deskew Image Example Deskewing is the process of straightening an image that may be slightly tilted or skewed. It corrects any slant or misalignment, ensuring that the text or content appears horizontally aligned. To apply deskewing to the image, use the Deskew method. This method accepts an integer value that specifies the maximum angle of skew to correct. Higher values may provide more opportunities for correction, but they can result in slower processing and an increased risk of errors, including upside-down pages. :path=/static-assets/ocr/content-code-examples/how-to/image-orientation-correction-deskew-image.cs // Apply deskew imageInput.Deskew(); ' Apply deskew imageInput.Deskew() $vbLabelText $csharpLabel Before After Scale Image Example Scaling involves resizing an image to a specific dimension or aspect ratio. This can be useful to standardize image sizes for more consistent text recognition. To apply scaling to the image, use the Scale method. The Scale method takes a percentage value, with 100% meaning no effect. The second parameter is the ScaleCropArea, which determines whether associated crop areas should also be scaled proportionally (recommended as 'true'). :path=/static-assets/ocr/content-code-examples/how-to/image-orientation-correction-scale-image.cs // Apply scale imageInput.Scale(70); ' Apply scale imageInput.Scale(70) $vbLabelText $csharpLabel Size comparison Frequently Asked Questions What are the key methods for correcting image orientation in .NET C#? In .NET C#, you can correct image orientation using IronOCR's methods such as Rotate for changing the angle, Deskew for straightening tilted images, and Scale for resizing to ensure proper text alignment and recognition. How does the Rotate method in C# help with image orientation? The Rotate method in C# helps adjust an image's angle to ensure that text is upright. By passing a positive degree value, the image rotates clockwise; a negative value rotates it counterclockwise. Why is deskewing important in image processing? Deskewing is crucial in image processing as it straightens tilted images, ensuring horizontal alignment of text, which improves the accuracy of Optical Character Recognition (OCR) results. How can scaling affect text recognition in images? Scaling an image ensures that all parts of the image are proportionally resized, which helps in maintaining uniform text size and improves the consistency and accuracy of text recognition. Can I apply image orientation correction to PDF documents using C#? Yes, using IronOCR, you can import PDF documents and apply image orientation corrections like rotation, deskewing, and scaling to enhance text recognition. How can I export corrected images after processing in a .NET application? After processing and correcting images using IronOCR, you can export the modified images by utilizing the SaveAsImages method. What should I consider when choosing deskew values for image correction? When choosing deskew values, consider that higher values might offer more correction opportunities but could slow down processing and potentially cause errors, such as upside-down images. What is the process of preparing images for OCR in C#? Preparing images for OCR in C# involves correcting orientation using methods like Rotate, Deskew, and Scale provided by IronOCR, ensuring that text is properly aligned and sized for accurate recognition. Chaknith Bin Chat with engineering team now Software Engineer Chaknith works on IronXL and IronBarcode. He has deep expertise in C# and .NET, helping improve the software and support customers. His insights from user interactions contribute to better products, documentation, and overall experience. Reviewed by Jeffrey T. Fritz Principal Program Manager - .NET Community Team Jeff is also a Principal Program Manager for the .NET and Visual Studio teams. He is the executive producer of the .NET Conf virtual conference series and hosts 'Fritz and Friends' a live stream for developers that airs twice weekly where he talks tech and writes code together with viewers. Jeff writes workshops, presentations, and plans content for the largest Microsoft developer events including Microsoft Build, Microsoft Ignite, .NET Conf, and the Microsoft MVP Summit Ready to Get Started? Free NuGet Download Total downloads: 4,306,473 View Licenses