News Reader said:
I have some PDF files that I'd like to edit: either copy or make some
text bold. Some of the lines can be copied or selected, but most
cannot. What causes this and can it be overcome?
Thanks for any help.
PDF is a kind of electronic paper, and as such is by nature not
editable. You can mark it up with the Adobe reader, but editing it is
not really in the cards directly. There are some programs that will
allow some modification, but if you'd like to edit the document as if it
were in a word processor, or a DTP program, then forget it. PDF's are
not created for that purpose.
The reasons that some text might not be selectable is that it may in
fact have been rendered by the PDF creation program as graphics rather
than text with attributes. It's kinda weird how this happens but any
document needs to be made a postscript document before it can be
packaged as a PDF. Because of this, especially on Windows systems, fonts
get substituted and sometimes rendered as graphics. Postscript has it's
roots firmly planted in the Unix realm, and is a bit of a kludge in
Windows.
Hope this helps clear things up for you.