action->set_param("canvas",get_canvas());
action->set_param("canvas_interface",get_canvas_interface());
action->set_param("value_desc",value_desc);
action->set_param("new_value",ValueBase(gradient));
action->set_param("time",time);
action->set_param("canvas",get_canvas());
action->set_param("canvas_interface",get_canvas_interface());
action->set_param("value_desc",value_desc);
action->set_param("new_value",ValueBase(gradient));
action->set_param("time",time);