how do I redact a screenshot using preview

Tony T1 wrote:

Then, just to be safe, print as PDF

Are you sure about that?

/Users/jdaniel/Desktop $ grep --binary-file=text redact how\ do\ I\ redact\ a\ screenshot\ using...:\ Apple\ Support\ Communities.pdf

(how do I redact a screenshot using...: Apple Support Communities)

/Users/jdaniel/Desktop $ grep --binary-file=text redact redacted.pdf

(how do I redact a screenshot using...: Apple Support Communities)

/Users/jdaniel/Desktop $ grep --binary-file=text redact redacted.pdf

(how do I redact a screenshot using...: Apple Support Communities)

/Users/jdaniel/Desktop $ grep --binary-file=text redact redacted_print.pdf

(how do I redact a screenshot using.../ Apple Support Communities)

Save as PNG or JPEG and then send it.

Point taken on saving to PNG or JPEG, but I took this screenshot from the 1st post in this thread (and redacted the word redact)

Then I ⌘P [PDF⬇ ]->Save as PDF (saved as 1.pdf)

and

MacBook-Air:~ Tony$ grep --binary-file=text redact /Users/Tony/Desktop/1.pdf 
MacBook-Air:~ Tony$

also

MacBook-Air:~ Tony$ grep --binary-file=text How /Users/Tony/Desktop/1.pdf 
MacBook-Air:~ Tony$

Use the line function, set to wide.

Then, (and this is important) Print as PDF and use the new PDF you printed (not the one you redacted).

Result will be:

That is why PDF is risky. Sometimes it has only images and sometimes it has text. I bet if you opened your PDF in something like iDraw, you would be able to un-redact even an image-based PDF.