[Gimp-user] help

[Thomas Widlar <twidlar yahoo com>]

1. I've just downloaded and installed GIMP and GIMP help system for 
Win7. When I hover over the action buttons or options, I'm told to press 
F1 for help, but no help comes up. What do I need to do sto connect GIMP 
to its help.
2. My first task is to upgrade some music pages for a composer. He has 
grayscale PDFs. The music scanned well but the horizontal staff lines 
are a light grey, clear but light. How do I make any pixel darker than 
certain threshold value black? How do I set that threshold?
I have no experience with GIMP, just some minimal experience with 
MSPAINT. But I'm happy to learn.