- Clic droit sur le calque
- Alpha to Selection
- Select > Grow > 1 px
- Sélectionner (ou rajouter) un calque en dessous
- Remplir la sélection
Your language isn't broken, it's doing floating point math. Computers can only natively store integers, so they need some way of representing decimal numbers. This representation comes with some degree of inaccuracy. That's why, more often than not, .1 + .2 != .3.