Image Deskew & Correction¶
The image correction tools let you fix common problems with scanned or photographed documents before running OCR. Straightening, rotating, and cropping images can dramatically improve text extraction accuracy.
Available Corrections¶
Deskew (Auto-Straighten)¶
Automatically detects the angle of text lines and rotates the image so they are perfectly horizontal. This is essential for scanned documents that were slightly tilted during scanning.
How to use:
- Load your image
- Click Image Tools > Deskew
- The image is automatically straightened
- Review the result and proceed to OCR
Rotate¶
Manually rotate the image in 90-degree increments or enter a custom angle:
- Rotate Left -- 90 degrees counterclockwise
- Rotate Right -- 90 degrees clockwise
- Rotate 180 -- Flip upside down
- Custom angle -- Enter any degree value for fine adjustments
This is useful for images that were scanned sideways or upside down.
Crop¶
Remove unwanted areas from the image, such as borders, margins, or non-text regions:
- Click Image Tools > Crop
- Drag the crop handles to select the area you want to keep
- Click Apply to crop
Crop Before OCR
Cropping out non-text areas like logos, decorative borders, or stamps before running OCR reduces noise and improves accuracy.
Brightness and Contrast¶
Adjust brightness and contrast to make faded or poorly lit text more readable:
- Brightness -- Lighten or darken the overall image
- Contrast -- Increase the difference between text and background
Combining Corrections¶
You can apply multiple corrections in sequence. A typical workflow for a difficult scanned document:
- Deskew to straighten the text
- Crop to remove borders and margins
- Contrast to enhance the text visibility
- Run OCR on the corrected image
Undo and Reset¶
All corrections are non-destructive. Use Undo (Ctrl+Z) to revert the last change, or click Reset to restore the original image.
Original File Preserved
Image corrections are applied only within the app. Your original image file is never modified unless you explicitly save over it.