# Image preprocessing and OCR accuracy in C#

Nutrient.NET SDK (formerly GdPicture.NET) enables you to automatically preprocess and correct poorly scanned documents. Leverage automatic image correction and preprocessing to improve readability (automatic deskew, invert, noise removal, and more). Explore our guides and code samples to learn how you can integrate our image preprocessing technology into your application or workflow.

Don’t preprocess documents before recognizing text with OCR. Nutrient.NET SDK’s OCR engine preprocesses documents automatically with better results than manual preprocessing.

## Guides for preprocessing

**[Deskew](https://www.nutrient.io/guides/dotnet/ocr/preprocess/deskew.md)**\
How to auto-deskew files with preprocessing

**[Auto-invert](https://www.nutrient.io/guides/dotnet/ocr/preprocess/auto-invert.md)**\
How to auto-invert files with preprocessing

**[Enhance characters](https://www.nutrient.io/guides/dotnet/ocr/preprocess/enhance-characters.md)**\
How to auto-enhance characters with preprocessing

**[Remove noise](https://www.nutrient.io/guides/dotnet/ocr/preprocess/remove-noise.md)**\
How to automatically remove noise and blemishes from documents

**[Remove lines](https://www.nutrient.io/guides/dotnet/ocr/preprocess/remove-lines.md)**\
How to automatically remove lines from documents

**[Remove punch holes](https://www.nutrient.io/guides/dotnet/ocr/preprocess/remove-punch-holes.md)**\
How to automatically remove punch holes from documents

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## Related pages

- [Remove lines from images and PDFs in C#](/guides/dotnet/ocr/preprocess/remove-lines.md)
- [Deskew PDFs and images in C#](/guides/dotnet/ocr/preprocess/deskew.md)
- [Remove punch holes from images and PDFs in C#](/guides/dotnet/ocr/preprocess/remove-punch-holes.md)
- [Auto-invert images and PDFs in C#](/guides/dotnet/ocr/preprocess/auto-invert.md)
- [Enhance characters in PDFs and images in C#](/guides/dotnet/ocr/preprocess/enhance-characters.md)
- [Remove noise from images in C#](/guides/dotnet/ocr/preprocess/remove-noise.md)