[Matplotlib-users] Change hatch intensity/color for PDF backend

[T J <tj...@gm...>]

I am using the PDF backend and specifying a hatch for a fill_between()
call.  The resultant PDF looks okay, but the hatch lines are too
light.

Is there a way to darken them?  Also, is it possible to change the
color of the hatch lines? I'm okay solutions that are low-level hacks.
 I just need the PDF to have proper hatches.