The Flip Horizontally command reverses the selected layers horizontally, that is, from left to right.
It leaves the dimensions of the layers and the pixel information unchanged.
You can access this command
From the main menu through Layer → Transform → Flip Horizontally.
Figure 16.103. Application de Miroir horizontal sur un calque
Avant application de la commande
Après application de la commande. Tout se passe comme si le motif était retourné selon l’axe vertical médian du calque.