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What I want to do is convert a pdf file that has colorful fonts to one that all it's fonts' colors are black.

This is not a duplicate of this question here. I don't want greyscale fonts I want them to be only black. gs with psmono device is not an option since it was removed in later ghostscript releases.

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Option 1:

convert -monochrome in.pdf out.pdf

Option 2:

You can still download Ghostscript 9.07

https://ghostscript.com/Ghostscript_9.07.html

Compile it from source and make install the result.

In v9.07 the psmono output device still works. If you want to use the new v9.2+ version also, do not install the compiled v9.07 version but use it directly.

e.g.

./gs907 -sDEVICE=psmono -o out.ps -f in.pdf

Note: the PSMono device will flatten your file and make the content text not selectable.

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