How to Invert a Selection in Krita (Ctrl+Shift+I)

Ctrl+Shift+I inverts the active selection in Krita — everything currently selected becomes unselected, and everything outside it becomes selected. On macOS it is Cmd+Shift+I. The shortcut requires an existing selection; with nothing selected it has no meaningful effect. **The mistake almost everyone makes first.** Ctrl+I — the same combination without Shift — is the Invert colour filter, which turns the layer into a photographic negative. The two shortcuts sit one modifier apart and do entirely unrelated things. Photoshop users are hit hardest, because in Photoshop Ctrl+I *is* the selection inversion, so the reflex is not merely unhelpful but points at exactly the wrong command. The error is at least loud rather than silent: an inverted image is unmistakable, and Ctrl+Z undoes the filter cleanly because it is an ordinary undoable action. **Why inverting is usually easier than selecting directly.** The standard case is isolating a subject from a background. Selecting a complex silhouette — hair, foliage, an irregular outline — is slow and fiddly. Selecting the background is often trivial, because backgrounds tend to be flatter and more contiguous, which makes them a single click for the contiguous selection tool. Select the easy region, invert, and you have the hard region without having traced it. This is the reason inversion earns a shortcut at all rather than living in a menu. **Feathering survives inversion, which is what you want.** If the original selection had a soft edge, the inverted one has the complementary soft edge, so the two fit together without a seam. That means you can build one carefully-feathered selection and work on both sides of it by inverting between passes — adjusting a subject, inverting, adjusting the background — without the boundary between them ever showing. **Inversion is not the same as deselecting.** After inverting you still have a live selection, just a different one, and painting is still restricted to it. If your intent was to remove the restriction entirely, that is Ctrl+Shift+A. Confusing the two produces the classic Krita puzzle where strokes appear in one region and nowhere else. If Ctrl+H has also hidden the marching-ants overlay, there is no visual clue at all — so when painting stops working across most of the canvas, deselect first and diagnose afterwards. **Recovering from an over-eager deselect.** Ctrl+Shift+D reselects, restoring the previous selection with its exact shape and feathering. Between inversion and reselection, most selection work in Krita is recoverable, which is worth knowing before you start retracing an outline you thought you had lost. **Inverting works on any selection, however it was made.** The command does not care whether the region came from a rectangular drag, a freehand lasso, a contiguous colour pick, a magnetic edge trace or a selection loaded from a mask. It operates on the selection as it currently stands, which means you can assemble something complicated out of several tools and additive modes and invert the finished result in one keystroke. That composability is the reason the workflow of selecting the easy side and inverting scales beyond simple cases — the easy side does not have to be simple, only easier.