Enhancement

The enhancement filters prepare document images taken with camera phone for text recognition and improve visual quality by correcting common issues in full auto mode.

They are available in the Page view.

- press to select from the list and apply filters:

Brightness/Contrast - automatically corrects document brightness and contrast to provide the best image quality.

To Grayscale - removes color information and converts the image to gray scale.

Invert Colors - inverts colors of the image.

Flatten Brightness - makes text and fine detail more legible by automatically increasing local contrast without affecting digital noise or introducing image artifacts.

Clean Background - removes distracting background elements such as texture, dots, lines, as well photocopying and scanning artifacts common in documents such as ID cards and passports, bank checks, tickets, and so on.

White Background - makes the whole document background white while presenting text characters in black, even if inverse fonts (bright text on dark background) or light colors were originally used.

Apply Threshold - intelligently converts the image to grayscale. This filter is intended to prepare for OCR text.

Auto Enhance - enhances local contrast, converts background to white (output image becomes greyscale).

Remove Noise - automatically removes ISO noise from images.