Contrast and Brightness Enhancement in PDF (B/W Effect)

PDF readability in Librera Reader can be improved significantly by manual adjustments to brightness and contrast settings. When you switch to manual mode, your document will be displayed in black-and-white and you will see the results of your adjustments in real time in the background, behind the Contrast and Brightness window. The adjustments mimic the effect often used in E-Ink readers.

You can adjust the following settings:

All three settings can be applied separately or you can use all three combined.





Emphasize all (bold-letter effect)


To discard your manual settings, use the Restore default link at the bottom of the Contrast and Brightness window.