https://testing.docs.gimp.org/3.2/es/gimp-layer-flip-horizontal.html
7.46. Voltear horizontalmente
https://testing.docs.gimp.org/3.2/es/gimp-tool-flip.html
4.12. Voltear
https://docs.gimp.org/3.0/es/gimp-layer-flip-horizontal.html
7.46. Voltear horizontalmente