For all files in this directory, the following applies:

# Copyright (C) 2010-2011
# Martin Lambers <marlam@marlam.de>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty provided the copyright notice and this
# notice are preserved. This file is offered as-is, without any warranty.

The icons were created with ipe and converted to png using
iperender -png -resolution 100 <icon.ipe> <icon.png>

Unfortunately, iperender seems to mishandle transparency, so as a
postprocessing step, transparency was repaired using Gimp's color to alpha
function on white.
