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I have a large color PDF that I can easily view greyscale in Foxit Reader:

foxit color controls

Unfortunately various bits of text end up in ridiculously light shades of grey. Similar, but not direct, questions include:

How can I force a PDF to display only in pure black and white?

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Where does the file come from? Perhaps it is better to make it black and white in the original format? –  vonbrand Jan 29 '13 at 16:27
    
It is an autocad drawing, but I don't have autocad. –  Bryce Feb 5 '13 at 15:40

1 Answer 1

up vote 0 down vote accepted

ImageMagick is free and cross-platform. This command should work:

convert <input> -threshold xx% <output>

For example:

convert original.pdf -threshold 50% new.pdf

You'll have to set the threshold to taste.

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