This is the bandwidth graph that one finds on the kernel.org
homepage.

C code creates a postscript file that is fed to ghostscript
to create a pnm file that is scaled to 50% with pnmscale to
antialias and then converted to png by pnmtopng, and the original
postscript output file is converted to pdf by ghostscript's
ps2pdf14.

You'll need ghostscript installed in addition to netpbm for
the other tools.  Ghostscript itself could have been used to
create a png, but the output file was much larger and the
resulting image was not as visually appealing.

Please put "[KORG]" in the subject when emailing me at kernel.org
or I will never see your email through all the spam kernel.org gets.

-- Nathan Laredo
laredo@kernel.org