Margin: This is for the margin you want to keep for
automatic crop. You can adjust it to the size you want.
In zoom-in status, when the zoomed-in page exceeds the
screen area, you can drag the page around to check
different areas. A single tap only turns sub-pages. Tap
the Virtual Buttons to turn the whole page.
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
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