Here my code: images.push_back(Image("1.png")); images.push_back(Image("2.png")); images.push_back(Image("3.png")); for (auto i = images.begin(); i < images.end(); i++) { i->label(i->fileName()); i->magick("PSD"); i->backgroundColor("none"); i->colorspaceType(RGBColorspace); i->alphaChannel ...