Of course since the kernel is no longer separable, it becomes awfully
    slow with large images. Here is a tileable brushed metal texture:
    # pipi pipi:random512x512 --wrap --blur 20x0r25 -o image.png

git-svn-id: file:///srv/caca.zoy.org/var/lib/svn/libpipi/trunk@2715 92316355-f0b4-4df1-b90c-862c8a59935f