Quote:
Originally Posted by mldma
Thank you,
By the use of "k2pdfopt -ml 0.2 -mt 0.3 -mr 0.4 -mb 0.5" command, my pdf file was turned to be B/W but the format of some pages were also adjusted.What I want is change the color pdf monochrome one and let those light colour text readable in e-ink reader.
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The numbers were just an example. How much you want to trim depends on your document (measure the borders and use these values).
Have you tried the gamma option with different values? Because you can not make specific colors darker and leave the rest as it is as far as I know. You would need a PDF editor for that.