`genpng` example
genpng man page mentions that this tool generates an overview image from source coverage. Is it just a rendered HTML? How does it looks like?
It's not rendered HTML - just a mock-up of how a miniaturized version of the source code looks with colors.
See the following for an example:
http://ltp.sourceforge.net/coverage/lcov/output/example/methods/gauss.c.gcov.frameset.html
The image in the left frame is the output of genpng.
Thanks. Found it.

Some editors call it minimap and I guess it is taller for larger files. Not sure how to document it with man, which doesn't support graphics. Maybe mentioning where this image is used can give the point.
This appear to be resolved to everybody's satisfaction :-) Closing now - in the interest of cleaning up the lcov issue list. Henry