Preflight is not a color management question?
And how does one change a message to another forum?
It would be nice to get a little help, here.
Depending on which version of Acrobat you have:
- go to 'Advanced' or 'View > Tools' > Print Production
- Select Preflight
- Select the 'Select single fixups' button (the small icon with the wrench)
- Search for Grayscale
- Select the fix profile 'convert to grayscale'
- Run the 'fixing profile' on the PDF, and all colors should be converted to gray.
Hope this helps.
Preflight is not a color management question?…
As posted, it is unmistakably an application-specific question. (As also evidenced by the response you got in post #2.)
…And how does one change a message to another forum?…
You can't. You start a new thread in the appropriate forum and copy and paste your question there.
Incidentally, you're not addressing Adobe here. We're all users just like you.
You're bound to find a lot more users who know Acrobat inside and out in the Acrobat forum, obviously.