I was wondering the same. Haven't studied all possibilities of the device yet so this might be a standard feature. I have difficulties reading one of my pdfs that have text with colours in it. The coloured text is light gray on the reader screen and makes it very hard to read. The ability to read this PDF as 100% black would help a lot.
I am sure there is a workaround (i.e. convert with calibre), but prefer an easier solution.
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