Onyx Boox Poke5P User Manual page 41

Contrast
Embolden: only embolden text
in PDF
Sharpen Img: Make blur image
sharper
Watermark Bleaching: Bleach
the light-color images or background on the page
Dark Color Enhancement: Adjust for the whole page or only
the text, making the display darker;
Picture dithering: Optimize the display effect of pictures
with gradient colors;
Navigation
This section includes Comic Mode, Article Mode, Reflow,
and more custom settings. You can crop a scanned PDF,
divide it into columns, and set its browsing orders.