diff --git a/frontend/src/hooks/useKeyboardShortcuts.ts b/frontend/src/hooks/useKeyboardShortcuts.ts
index 6265da3..07c8547 100644
--- a/frontend/src/hooks/useKeyboardShortcuts.ts
+++ b/frontend/src/hooks/useKeyboardShortcuts.ts
@@ -219,6 +219,11 @@ export function useKeyboardShortcuts(props: KeyboardShortcutsProps) {
   }
 
   /** The set of photo ids the next culling action should apply to.
+   *  - Preview mode → the currently-viewed photo (activePhotoId), since
+   *    arrow nav inside preview only updates activePhotoId and leaves
+   *    selectedPhotos pointing at whatever the user selected in the grid
+   *    before opening preview. Honouring selectedPhotos here would cull
+   *    the wrong photo and the filmstrip tint wouldn't appear to react.
    *  - Multi-selection → all selected photos
    *  - Single selection → that one photo
    *  - No selection but an activePhotoId set (last clicked) → that one
@@ -226,6 +231,9 @@ export function useKeyboardShortcuts(props: KeyboardShortcutsProps) {
    */
   const cullTargets = (): string[] => {
     const state = usePhotoStore.getState()
+    if (state.viewMode === 'preview') {
+      return state.activePhotoId ? [state.activePhotoId] : []
+    }
     if (state.selectedPhotos.length > 0) return state.selectedPhotos
     if (state.activePhotoId) return [state.activePhotoId]
     return []
@@ -342,13 +350,9 @@ export function useKeyboardShortcuts(props: KeyboardShortcutsProps) {
   })
 
   const togglePickOnSelection = () => {
-    const state = usePhotoStore.getState()
-    const ids =
-      state.selectedPhotos.length > 0
-        ? state.selectedPhotos
-        : state.activePhotoId
-          ? [state.activePhotoId]
-          : []
+    // Reuse cullTargets so preview-mode arrow-nav targets the visible
+    // photo, not the stale grid selection (same fix as X / discard).
+    const ids = cullTargets()
     if (ids.length === 0) {
       toast.info('Nothing selected', 'Select photos first, then press S')
       return