I'm trying to convert a PDF to black and white but the colored text becomes almost unreadable.

  • Is there a way to fix this ?
  • Or a better way to make the conversion ?

Command used :

gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.3 -sColorConversionStrategy=Gray -o output.pdf input.pdf


  • The text is already hard to read in the original. Note that this is not due to opacity, but due to brightness. ghostscript does a pretty good job at keeping the brightness the same. Is forcing all color to black as described in superuser.com/questions/200378/… an option (also referenced here)? – Hermann Dec 28 '18 at 12:47

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