How to make light gray text black

Question

On Adobe Acrobat DC, how do you make light gray text into black text? The document in question has no color, so I don't want to convert color into anything; I just want to convert gray to black. I have tried selecting Promote Gray to CMYK Black, but that did nothing. If anyone answers, please don't just say "go to Accessibility" or "Go to Preflight" or whatever; I'd be very grateful for instructions as specific as you can!

If it's not possible to darken the text, I'd settle for darkening the entire document, but I don't know how to do that either. (I don't have either Photoshop or GIMP, and when I tried opening in Word, the document was considerably messed up.)

Thank you!

Luke Jennings3 · Answer

You can use a preflight profile to map the gray to 100% black, here is a link to a related discussion with instructions:

https://community.adobe.com/t5/acrobat-discussions/how-to-convert-color-image-to-black-in-acrobat-dc/m-p/11138554#M257032

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