diff --git a/crates/ui-egui/src/panels/detail.rs b/crates/ui-egui/src/panels/detail.rs
index 3b3622be..cbe113b2 100644
--- a/crates/ui-egui/src/panels/detail.rs
+++ b/crates/ui-egui/src/panels/detail.rs
@@ -1527,8 +1527,10 @@ pub(crate) fn filmstrip(app: &mut LightcraftApp, ui: &mut egui::Ui, r: Rect) {
             let resp = ui.interact(cr, egui::Id::new(("film", id.0)), Sense::click());
             register(ui.ctx(), format!("film:{}", id.0), cr);
             let sel = Some(*id) == active;
+            // as in the grid: every selected photo is filled, the active one framed in white (#187)
+            let selected = sel || app.session.selection.contains(*id);
             let p = ui.painter();
-            if sel {
+            if selected {
                 p.rect_filled(cr, 0.0, t.cell_selected);
             } else if resp.hovered() {
                 p.rect_filled(cr, 0.0, t.cell_selected.gamma_multiply(0.6));
@@ -1549,6 +1551,8 @@ pub(crate) fn filmstrip(app: &mut LightcraftApp, ui: &mut egui::Ui, r: Rect) {
                 p.image(tex.tex.id(), fr, Rect::from_min_max(pos2(0.0, 0.0), pos2(1.0, 1.0)), Color32::WHITE);
                 if sel {
                     p.rect_stroke(fr, 0.0, Stroke::new(1.5, Color32::WHITE), StrokeKind::Outside);
+                } else if selected {
+                    p.rect_stroke(fr, 0.0, Stroke::new(1.5, Color32::from_gray(170)), StrokeKind::Outside);
                 }
                 if app.ui.settings.film_badges
                     && let Some(ph) = app.session.catalog.photo(*id)
diff --git a/crates/ui-egui/src/tests_scroll.rs b/crates/ui-egui/src/tests_scroll.rs
index 05167c47..455bd0d8 100644
--- a/crates/ui-egui/src/tests_scroll.rs
+++ b/crates/ui-egui/src/tests_scroll.rs
@@ -1,6 +1,6 @@
 //! Headless tests of the photo grid's and the filmstrip's scrolling (issue #11): the user's
 //! scroll position stays put until the active photo changes; the mouse wheel scrolls the
-//! filmstrip sideways.
+//! filmstrip sideways. The filmstrip also shows which photos are selected (issue #187).
 
 use std::time::Duration;
 
@@ -115,3 +115,31 @@ fn filmstrip_wheel_scrolls_and_keeps_its_position() {
     let cell = widget(&h, &format!("film:{second}"));
     assert!(cell.left() >= 0.0 && cell.right() <= 1200.0, "the new active photo is in view ({cell:?})");
 }
+
+#[test]
+fn filmstrip_shows_every_selected_photo() {
+    let mut h = demo("detail");
+    let ids = h.app.session.visible_cloned();
+    let (first, second) = (ids[0].0, ids[1].0);
+    // a cell's background, left of its thumbnail
+    let fill = |h: &mut Headless, id: u64| {
+        let r = widget(h, &format!("film:{id}"));
+        let img = h.snapshot(SETTLE);
+        img.pixels[(r.center().y as usize) * img.width() + r.left() as usize + 4]
+    };
+    let active = fill(&mut h, first);
+    let idle = fill(&mut h, second);
+    assert_ne!(active, idle, "only the active photo is selected");
+    // Select All: the other photos are selected too, the first stays active
+    let r = h.request("engine.execute", json!({"command": "library.selectAll"}), T);
+    assert_eq!(r["ok"], true, "{r}");
+    assert_eq!(h.app.session.active().map(|p| p.0), Some(first));
+    assert_eq!(fill(&mut h, second), active, "a selected photo that is not the active one looks selected");
+    // back to one photo; then what a ⌘-click on a filmstrip cell runs (toggle) adds the second
+    let r = h.request("engine.execute", json!({"command": "library.select", "params": {"ids": [first]}}), T);
+    assert_eq!(r["ok"], true, "{r}");
+    assert_eq!(fill(&mut h, second), idle);
+    let r = h.request("engine.execute", json!({"command": "library.select", "params": {"ids": [second], "mode": "toggle"}}), T);
+    assert_eq!(r["ok"], true, "{r}");
+    assert_eq!(fill(&mut h, second), active);
+}
diff --git a/docs/parity.md b/docs/parity.md
index d5a31ea9..3eeb91b3 100644
--- a/docs/parity.md
+++ b/docs/parity.md
@@ -171,7 +171,7 @@ under the UI command that wraps it (a no-op error); the UI command now wins.
 | LR-VIEW-DETAIL | Single-photo view | P0 | ✅ | `cmd:view.detail`, `crates/ui-egui/src/panels/detail.rs` | |
 | LR-VIEW-EDIT | Edit view | P0 | ✅ | `cmd:panel.edit` | |
 | LR-VIEW-FULLSCREEN | Full-screen preview | P1 | ✅ | `cmd:view.fullScreenPreview`, `cmd:view.enterFullScreen` | photo on black, arrows step, Esc exits; ⇧⌘F window full screen |
-| LR-VIEW-FILMSTRIP | Filmstrip | P0 | ✅ | `cmd:view.filmstrip`, `crates/ui-egui/src/panels/detail.rs` | the photo context menu on right-click; the mouse wheel scrolls it sideways; it follows the active photo only when that changes (centred if off screen), so a scrolled strip stays put |
+| LR-VIEW-FILMSTRIP | Filmstrip | P0 | ✅ | `cmd:view.filmstrip`, `crates/ui-egui/src/panels/detail.rs` | the photo context menu on right-click; the mouse wheel scrolls it sideways; it follows the active photo only when that changes (centred if off screen), so a scrolled strip stays put; every selected photo is highlighted, the active one framed in white, as in the grid |
 | LR-VIEW-ZOOM | Zoom & pan | P0 | ✅ | `cmd:view.zoomFit`, `cmd:view.zoom100`, `cmd:view.zoomIn`, `cmd:view.zoomOut`, `cmd:view.zoomToggle`, `cmd:view.clickZoom` | steps 25–800 % (not 6–1600 %); Fill only in the bottom bar; a click on the photo (and Z / Space) eases to the click-zoom ratio (1:1 default, 2:1, 3:1, 4:1, 8:1 in the bottom bar) |
 | LR-VIEW-NAVIGATOR | Navigator mini map | P1 | ✅ | `cmd:view.navigator`, `crates/ui-egui/src/panels/detail.rs` | shown while zoomed (bottom right); click/drag pans |
 | LR-VIEW-BEFOREAFTER | Before / after | P0 | ✅ | `cmd:view.showOriginal`, `cmd:view.beforeAfter`, `cmd:view.beforeAfterSplit`, `cmd:view.beforeAfterTopBottom`, `cmd:view.beforeAfterSplitTopBottom`, `cmd:beforeAfter.setBefore`, `cmd:beforeAfter.copyAfterToBefore`, `cmd:beforeAfter.copyBeforeToAfter`, `cmd:beforeAfter.swap`, `cmd:beforeAfter.resetBefore` | all four layouts; before = the import state (defaults + import preset) or a chosen history step / version / the current settings; copy and swap (View → Before/After Settings, History row menu). The chosen before lasts for the session |