How to Clean Up Scanned PDF and Remove Shadows on Android
Harsh overhead lighting and hand shadows make scanned documents hard to read. Here is how to eliminate shadows and background noise cleanly on Android.
To clean up a scanned PDF and remove shadows: 1) Open ScanOrbit and scan the document. 2) Switch the filter from Original to B&W High-Contrast or Document Magic. 3) The local thresholding engine removes dark paper shadows and whitening gray paper grain in real time. 4) Export a crisp, high-contrast A4 PDF.
1. Position Phone Directly Overhead
Avoid extreme angles that cast your phone’s shadow directly onto the center of the page. Angle lighting from the side if possible.
2. Apply High-Contrast B&W Thresholding
ScanOrbit analyzes local pixel luminosity. Pixels representing text are locked to pure black (#000000), while paper shadows are clamped to pure white (#FFFFFF).
3. Save Clean A4 Document
Review the sharpened page and tap Export to produce a clean, printer-friendly PDF file.
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