Contrast and Brightness in PDF (Black/White 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.