Roto: add parameters to process only some components (e.g. only alpha) see https://github.com/MrKepzie/Natron/issues/146  and https://github.com/MrKepzie/Natron/issues/143
Roto: add parameters to process only some components (e.g. only alpha)
see https://github.com/MrKepzie/Natron/issues/146  and https://github.com/MrKepzie/Natron/issues/143

olear/openfx-misc,olear/openfx-misc,olear/openfx-misc