[PLUG] Tweaking PDFs, font size and color

[Keith Lofstrom]

Are there useful linux tools for reformatting third
party PDF documents? 

An example is the seemingly well written but difficult-
to-read "systemd in SUSE Linux Enterprise 12":

https://www.suse.com/docrep/documents/huz0a6bf9a/systemd_in_suse_linux_enterprise_12_white_paper.pdf

Small gray main text font, half of each page is useless
whitespace.  Some text boxes are gray on light gray.
I'd like to increase font size and contrast and print
the result.  I collect annotated paper documents as
insurance, in case distro update mistakes make my
systems unusable and I need to repair them. 

So, what can I use to tweak these PDF pages?

Keith

BTW, poorly tested updates and core tool frobbing seems
to be more common.  Perhaps that is because I am less
agile now, with a lot of legacy data to maintain and no
interest in change for change's sake.

-- 
Keith Lofstrom          keithl at keithl.com