mentioned in issue #1060 (closed)

Wow this is great Jean! Maybe if possible can be nice to have also a single colour "hidder" like total black ( a lot used on some violent-documentary)

opaque color has always been possible but not really documented: simply set the "shape size" to -1. I am considering a change to make "pixelate" and "opaque color" options of the blur mmethod to make things more obvious, with pixelate being the default blur method. What do you think?

you are right! i completely forgot the -1 parameter.