Any reason for this Caroline? I know some councils like to display the signed copy of the minutes, with the signature redacted, of course, so they could display a pdf of the unsigned document with a black rectangle and nobody would be any the wiser!
A scanned pdf can be made readable, with the correct software, but an image, such as a jpeg, cannot. For minutes, agendas and supporting documentation, if it isn't searchable, it can't be read by a screen reader, so you'll fall foul of WCAG 2.1AA