Run specified G'MIC pipeline.
This is only useful when used from a shell, e.g. to avoid shell substitutions to happen in argument.
G'MIC is an open-source software distributed under the
CeCILL free software licenses (LGPL-like and/or
Copyrights (C) Since July 2008,
David Tschumperlé - GREYC UMR CNRS 6072, Image Team.