diff --git a/crates/ui-egui/src/canvas.rs b/crates/ui-egui/src/canvas.rs
index 211eb7ebc8..aab1cb05c8 100644
--- a/crates/ui-egui/src/canvas.rs
+++ b/crates/ui-egui/src/canvas.rs
@@ -1403,7 +1403,14 @@ pub(crate) fn ensure_filter_preview(app: &mut PhotocraftApp, idx: usize, ctx: &e
     }
     let cmd = d.fields.get("__command")?.as_str()?.to_string();
     // Previews edit what the command will: a targeted layer mask included (#780).
-    let params = app.with_mask_target(&cmd, crate::filter_dialog::params_of(&d.fields));
+    let mut params = app.with_mask_target(&cmd, crate::filter_dialog::params_of(&d.fields));
+    // Select and Mask previews in its view mode; holding X shows the image without one.
+    if crate::select_mask_view::owns(&d.fields) {
+        if crate::select_mask_view::hides_view(&d.fields) {
+            return None;
+        }
+        params = crate::select_mask_view::request_params(&d.fields, params);
+    }
     let st = app.session.documents().get(idx)?;
     // Filters whose features don't scale with a proxy preview at full resolution (#2063).
     let k = crate::filter_dialog::preview_factor(&cmd, &params, crate::proxy::preview_factor(&st.doc, crate::proxy::reduced_previews(app)));
@@ -2636,13 +2643,21 @@ pub fn canvas_view(app: &mut PhotocraftApp, ui: &mut egui::Ui, idx: usize, rect:
         // in (`layer_edges_rect`), so a press that Auto-Selects a layer outlines that layer.
         let layer_edges = painter.add(egui::Shape::Noop);
 
+        // Select and Mask outlines its refined selection (on its preview proxy, reduced by `k`) in
+        // the Marching Ants view and hides the ants in the others.
+        let refined = crate::select_mask_view::ants(app, idx);
+        let (outlined, k) = match &refined {
+            None => (doc.selection.as_ref(), 1),
+            Some(None) => (None, 1),
+            Some(Some((proxy, k))) => (proxy.selection.as_ref(), (*k).max(1)),
+        };
         // Selection outline: true boundary, animated marching ants (cached per revision).
-        if let Some(sel) = doc.selection.as_ref().filter(|_| app.ui.view.shows(app.ui.view.show.selection_edges) && !polygon_replaces_selection(app)) {
+        if let Some(sel) = outlined.filter(|_| app.ui.view.shows(app.ui.view.show.selection_edges) && !polygon_replaces_selection(app)) {
             // Trace at display resolution over the visible part only; key by the mask's tile identity
             // (not the document revision) so unrelated edits don't re-trace it. The step is in
             // device pixels per document pixel (`View::zoom`, not the point zoom), so a 1 px
             // selection still traces at 100% on a scaled display.
-            let step = (1.0 / view.zoom.max(1e-3)).log2().floor().exp2().clamp(1.0, 64.0) as u32;
+            let step = (1.0 / (view.zoom * k as f32).max(1e-3)).log2().floor().exp2().clamp(1.0, 64.0) as u32;
             let corners = [rect.min, pos2(rect.max.x, rect.min.y), rect.max, pos2(rect.min.x, rect.max.y)];
             let docs = [xf.to_doc(corners[0]), xf.to_doc(corners[1]), xf.to_doc(corners[2]), xf.to_doc(corners[3])];
             let mut x0 = docs[0][0];
@@ -2655,6 +2670,7 @@ pub fn canvas_view(app: &mut PhotocraftApp, ui: &mut egui::Ui, idx: usize, rect:
                 x1 = x1.max(d[0]);
                 y1 = y1.max(d[1]);
             }
+            let (x0, y0, x1, y1) = (x0 / f64::from(k), y0 / f64::from(k), x1 / f64::from(k), y1 / f64::from(k));
             let q = 256 * step as i32; // quantise the region so small pans reuse the cache
             // The view centre can be any finite number (`ui.set`, #980). Past ±2³⁰ there is no document
             // to outline, and the padding below (at most 2 · 256 · 64) can't overflow i32 from there.
@@ -2671,15 +2687,22 @@ pub fn canvas_view(app: &mut PhotocraftApp, ui: &mut egui::Ui, idx: usize, rect:
                 ^ (vis.x0 as u64) << 8
                 ^ (vis.y0 as u64) << 24
                 ^ (vis.x1 as u64) << 36
-                ^ (vis.y1 as u64) << 48;
+                ^ (vis.y1 as u64) << 48
+                ^ u64::from(k).rotate_left(5);
             let fresh = matches!(&app.outline_cache, Some((d, k, _)) if *d == doc.id && *k == key);
             if !fresh {
                 let t0 = crate::gpu_canvas::now_ms();
-                let b = app.cached_bounds(u64::MAX - doc.id.0, sel).intersect(&vis);
+                let bounds_key = if k > 1 { u64::MAX / 2 - doc.id.0 } else { u64::MAX - doc.id.0 };
+                let b = app.cached_bounds(bounds_key, sel).intersect(&vis);
                 // Filters can occupy every worker in Rayon's global pool. A parallel scan here would
                 // block the UI thread waiting for those workers, preventing job cancellation (#1554).
-                let segs =
+                let mut segs =
                     if app.session.has_jobs() { crate::outline::outline_scaled_serial(sel, b, step) } else { crate::outline::outline_scaled(sel, b, step) };
+                if k > 1 {
+                    let s = i32::try_from(k).unwrap_or(1);
+                    let up = |p: [i32; 2]| [p[0].saturating_mul(s), p[1].saturating_mul(s)];
+                    segs.iter_mut().for_each(|(a, b)| (*a, *b) = (up(*a), up(*b)));
+                }
                 app.perf.span("outline", crate::gpu_canvas::now_ms() - t0);
                 app.outline_cache = Some((doc.id, key, std::sync::Arc::new(segs)));
             }
diff --git a/crates/ui-egui/src/dialogs.rs b/crates/ui-egui/src/dialogs.rs
index 7cc87b2621..e57c01b4c9 100644
--- a/crates/ui-egui/src/dialogs.rs
+++ b/crates/ui-egui/src/dialogs.rs
@@ -254,9 +254,15 @@ pub fn show(app: &mut PhotocraftApp, ctx: &egui::Context) {
                     // Long parameter lists (Flame, Lighting Effects) scroll, so the title and the
                     // OK / Cancel buttons stay inside a small window.
                     let room = (ctx.content_rect().height() - DIALOG_CHROME).max(120.0);
-                    first_field_focused(ui, id, |ui| {
-                        egui::ScrollArea::vertical().id_salt(id.with("body")).max_height(room).show(ui, |ui| crate::filter_dialog::body(ui, &mut fields));
-                    });
+                    let body = |ui: &mut egui::Ui, fields: &mut serde_json::Map<String, Value>| {
+                        egui::ScrollArea::vertical().id_salt(id.with("body")).max_height(room).show(ui, |ui| crate::filter_dialog::body(ui, fields));
+                    };
+                    // Select and Mask leaves the keyboard to its view keys (F, X, O, V…).
+                    if crate::select_mask_view::owns(&fields) {
+                        body(ui, &mut fields);
+                    } else {
+                        first_field_focused(ui, id, |ui| body(ui, &mut fields));
+                    }
                 }
                 DialogKind::Command if fields.contains_key("__form") => crate::view_cmds::form_body(ui, &mut fields),
                 DialogKind::Command => {}
diff --git a/crates/ui-egui/src/filter_dialog.rs b/crates/ui-egui/src/filter_dialog.rs
index b5ffb786f1..95fef8f4f1 100644
--- a/crates/ui-egui/src/filter_dialog.rs
+++ b/crates/ui-egui/src/filter_dialog.rs
@@ -330,7 +330,8 @@ pub fn open(app: &mut PhotocraftApp, command: &str) -> Option<u64> {
     fields.insert("__command".into(), json!(command));
     fields.insert("__label".into(), json!(spec.label));
     fields.insert("__filter".into(), json!(true));
-    if command.starts_with("filter.") || PREVIEWED.contains(&command) {
+    // Select and Mask previews in its view modes (`select_mask_view`), not as the command's result.
+    if command.starts_with("filter.") || PREVIEWED.contains(&command) || command == crate::select_mask_view::COMMAND {
         fields.insert("__preview".into(), json!(true));
     }
     for p in parse_spec(spec.params) {
@@ -476,6 +477,9 @@ pub fn body(ui: &mut egui::Ui, f: &mut Map<String, Value>) {
             None => return,
         },
     };
+    if crate::select_mask_view::owns(f) {
+        crate::select_mask_view::controls(ui, f);
+    }
     for p in parse_spec(&spec) {
         match p.kind {
             Kind::Range { min, max, default } => {
@@ -646,6 +650,9 @@ pub fn preview_document_with(
     k: u32,
     cancel: Option<&photocraft_engine::jobs::JobCtx>,
 ) -> Option<Document> {
+    if command == crate::select_mask_view::COMMAND {
+        return crate::select_mask_view::preview_document(doc, active, params, k, cancel);
+    }
     // Warp Text renders the type again from the layer model (font size, position), which a
     // reduced proxy doesn't scale: it runs at full size and the result is reduced (#218).
     let (run_k, reduce_k) = if command == "type.warpText" { (1, k) } else { (k, 1) };
diff --git a/crates/ui-egui/src/i18n/cs.tsv b/crates/ui-egui/src/i18n/cs.tsv
index 6a223d9d4b..162909fe2e 100644
--- a/crates/ui-egui/src/i18n/cs.tsv
+++ b/crates/ui-egui/src/i18n/cs.tsv
@@ -2562,4 +2562,13 @@ cameraData	Lens	Objektiv
 	Snap to Origin	Přichytit k počátku
 	Search settings…	Hledat nastavení…
 	No matching settings	Žádná odpovídající nastavení
+# Select and Mask view modes (#1754)
+	Onion Skin	Cibulová slupka
+	Marching Ants	Pochodující mravenci
+	On Black	Na černé
+	On White	Na bílé
+	On Layers	Na vrstvách
+	Show Edge	Zobrazit okraj
+	Show Original	Zobrazit originál
+	F cycles the views; hold X to see the image	F přepíná zobrazení; podržením X uvidíte obraz
 	Show rulers	Zobrazit pravítka
diff --git a/crates/ui-egui/src/i18n/de.tsv b/crates/ui-egui/src/i18n/de.tsv
index 9f1df14843..b4ce4f46a6 100644
--- a/crates/ui-egui/src/i18n/de.tsv
+++ b/crates/ui-egui/src/i18n/de.tsv
@@ -2593,4 +2593,13 @@ cameraData	Lens	Objektiv
 	Snap to Origin	An Ursprung ausrichten
 	Search settings…	Einstellungen durchsuchen…
 	No matching settings	Keine passenden Einstellungen
+# Select and Mask view modes (#1754)
+	Onion Skin	Zwiebelschicht
+	Marching Ants	Laufende Ameisen
+	On Black	Auf Schwarz
+	On White	Auf Weiß
+	On Layers	Auf Ebenen
+	Show Edge	Kante anzeigen
+	Show Original	Original anzeigen
+	F cycles the views; hold X to see the image	F wechselt die Ansicht; X gedrückt halten zeigt das Bild
 	Show rulers	Lineale anzeigen
diff --git a/crates/ui-egui/src/i18n/el.tsv b/crates/ui-egui/src/i18n/el.tsv
index c635b20fd5..729a3104ff 100644
--- a/crates/ui-egui/src/i18n/el.tsv
+++ b/crates/ui-egui/src/i18n/el.tsv
@@ -3654,4 +3654,13 @@ cameraData	Lens	Φακός
 	Snap to Origin	Προσκόλληση στην αρχή
 	Search settings…	Αναζήτηση ρυθμίσεων…
 	No matching settings	Δεν βρέθηκαν ρυθμίσεις
+# Select and Mask view modes (#1754)
+	Onion Skin	Φλούδα κρεμμυδιού
+	Marching Ants	Κινούμενο περίγραμμα
+	On Black	Σε μαύρο
+	On White	Σε λευκό
+	On Layers	Σε επίπεδα
+	Show Edge	Εμφάνιση άκρης
+	Show Original	Εμφάνιση αρχικού
+	F cycles the views; hold X to see the image	Το F εναλλάσσει τις προβολές· κρατήστε το X για να δείτε την εικόνα
 	Show rulers	Εμφάνιση χαράκων
diff --git a/crates/ui-egui/src/i18n/es.tsv b/crates/ui-egui/src/i18n/es.tsv
index 4c13ac63f5..c269fdc60e 100644
--- a/crates/ui-egui/src/i18n/es.tsv
+++ b/crates/ui-egui/src/i18n/es.tsv
@@ -2634,4 +2634,13 @@ cameraData	Lens	Objetivo
 	Snap to Origin	Ajustar a origen
 	Search settings…	Buscar ajustes…
 	No matching settings	No hay ajustes que coincidan
+# Select and Mask view modes (#1754)
+	Onion Skin	Papel cebolla
+	Marching Ants	Hormigas en marcha
+	On Black	Sobre negro
+	On White	Sobre blanco
+	On Layers	Sobre capas
+	Show Edge	Mostrar borde
+	Show Original	Mostrar original
+	F cycles the views; hold X to see the image	F alterna las vistas; mantén X para ver la imagen
 	Show rulers	Mostrar reglas
diff --git a/crates/ui-egui/src/i18n/fr.tsv b/crates/ui-egui/src/i18n/fr.tsv
index 896639c491..f487c4fbd5 100644
--- a/crates/ui-egui/src/i18n/fr.tsv
+++ b/crates/ui-egui/src/i18n/fr.tsv
@@ -2971,4 +2971,13 @@ cameraData	Lens	Objectif
 	Snap to Origin	Aligner sur l'origine
 	Search settings…	Rechercher des réglages…
 	No matching settings	Aucun réglage correspondant
+# Select and Mask view modes (#1754)
+	Onion Skin	Pelure d'oignon
+	Marching Ants	Fourmis en marche
+	On Black	Sur fond noir
+	On White	Sur fond blanc
+	On Layers	Sur les calques
+	Show Edge	Afficher le bord
+	Show Original	Afficher l'original
+	F cycles the views; hold X to see the image	F fait défiler les vues ; maintenez X pour voir l'image
 	Show rulers	Afficher les règles
diff --git a/crates/ui-egui/src/i18n/id.tsv b/crates/ui-egui/src/i18n/id.tsv
index b37faae5bd..cf74582bb9 100644
--- a/crates/ui-egui/src/i18n/id.tsv
+++ b/crates/ui-egui/src/i18n/id.tsv
@@ -2958,4 +2958,13 @@ cameraData	Lens	Lensa
 	Snap to Origin	Jepret ke Titik Asal
 	Search settings…	Cari pengaturan…
 	No matching settings	Tidak ada pengaturan yang cocok
+# Select and Mask view modes (#1754)
+	Onion Skin	Kulit Bawang
+	Marching Ants	Semut Berbaris
+	On Black	Di Atas Hitam
+	On White	Di Atas Putih
+	On Layers	Di Atas Lapisan
+	Show Edge	Tampilkan Tepi
+	Show Original	Tampilkan Asli
+	F cycles the views; hold X to see the image	F berganti tampilan; tahan X untuk melihat gambar
 	Show rulers	Tampilkan Penggaris
diff --git a/crates/ui-egui/src/i18n/it.tsv b/crates/ui-egui/src/i18n/it.tsv
index e4e4bdd4b0..7fb8e586e8 100644
--- a/crates/ui-egui/src/i18n/it.tsv
+++ b/crates/ui-egui/src/i18n/it.tsv
@@ -2625,4 +2625,13 @@ cameraData	Lens	Obiettivo
 	Snap to Origin	Aggancia all'origine
 	Search settings…	Cerca impostazioni…
 	No matching settings	Nessuna impostazione corrispondente
+# Select and Mask view modes (#1754)
+	Onion Skin	Velina
+	Marching Ants	Formiche in marcia
+	On Black	Su nero
+	On White	Su bianco
+	On Layers	Su livelli
+	Show Edge	Mostra bordo
+	Show Original	Mostra originale
+	F cycles the views; hold X to see the image	F scorre le viste; tieni premuto X per vedere l'immagine
 	Show rulers	Mostra righelli
diff --git a/crates/ui-egui/src/i18n/ja.tsv b/crates/ui-egui/src/i18n/ja.tsv
index d56c7b8590..fb0775a6be 100644
--- a/crates/ui-egui/src/i18n/ja.tsv
+++ b/crates/ui-egui/src/i18n/ja.tsv
@@ -3568,4 +3568,13 @@ cameraData	Lens	レンズ
 	Snap to Origin	原点にスナップ
 	Search settings…	設定を検索…
 	No matching settings	一致する設定はありません
+# Select and Mask view modes (#1754)
+	Onion Skin	オニオンスキン
+	Marching Ants	点線の境界
+	On Black	黒地
+	On White	白地
+	On Layers	レイヤー上
+	Show Edge	エッジを表示
+	Show Original	元の状態を表示
+	F cycles the views; hold X to see the image	F で表示を切り替え、X を押している間は画像を表示
 	Show rulers	定規を表示
diff --git a/crates/ui-egui/src/i18n/ko.tsv b/crates/ui-egui/src/i18n/ko.tsv
index 4022f9ecde..29a6bbdc96 100644
--- a/crates/ui-egui/src/i18n/ko.tsv
+++ b/crates/ui-egui/src/i18n/ko.tsv
@@ -3137,4 +3137,13 @@ cameraData	Lens	렌즈
 	Snap to Origin	원점에 스냅
 	Search settings…	설정 검색…
 	No matching settings	일치하는 설정 없음
+# Select and Mask view modes (#1754)
+	Onion Skin	어니언 스킨
+	Marching Ants	점선 윤곽
+	On Black	검정 배경
+	On White	흰색 배경
+	On Layers	레이어 위
+	Show Edge	가장자리 표시
+	Show Original	원본 표시
+	F cycles the views; hold X to see the image	F로 보기 전환, X를 누르고 있으면 이미지 표시
 	Show rulers	눈금자 표시
diff --git a/crates/ui-egui/src/i18n/nl.tsv b/crates/ui-egui/src/i18n/nl.tsv
index 75d2a4830e..d11991cbe0 100644
--- a/crates/ui-egui/src/i18n/nl.tsv
+++ b/crates/ui-egui/src/i18n/nl.tsv
@@ -3714,6 +3714,15 @@ cameraData	Lens	Lens
 	Search settings…	Instellingen zoeken…
 	No matching settings	Geen overeenkomende instellingen
 	PhotoCraft — Screen Color Picker	PhotoCraft — Schermkleurkiezer
+# Select and Mask view modes (#1754)
+	Onion Skin	Uienschil
+	Marching Ants	Mierenmars
+	On Black	Op zwart
+	On White	Op wit
+	On Layers	Op lagen
+	Show Edge	Rand tonen
+	Show Original	Origineel tonen
+	F cycles the views; hold X to see the image	F wisselt de weergaven; houd X ingedrukt om de afbeelding te zien
 	Show rulers	Linialen tonen
 	Frame Tool	Kadergereedschap
 	Create a new rectangular frame	Nieuw rechthoekig kader maken
diff --git a/crates/ui-egui/src/i18n/pl.tsv b/crates/ui-egui/src/i18n/pl.tsv
index fc02634de7..ae47472ac0 100644
--- a/crates/ui-egui/src/i18n/pl.tsv
+++ b/crates/ui-egui/src/i18n/pl.tsv
@@ -3569,4 +3569,13 @@ cameraData	Lens	Obiektyw
 	Snap to Origin	Przyciągnij do początku
 	Search settings…	Szukaj ustawień…
 	No matching settings	Brak pasujących ustawień
+# Select and Mask view modes (#1754)
+	Onion Skin	Skórka cebuli
+	Marching Ants	Maszerujące mrówki
+	On Black	Na czarnym
+	On White	Na białym
+	On Layers	Na warstwach
+	Show Edge	Pokaż krawędź
+	Show Original	Pokaż oryginał
+	F cycles the views; hold X to see the image	F przełącza widoki; przytrzymaj X, aby zobaczyć obraz
 	Show rulers	Pokaż linijki
diff --git a/crates/ui-egui/src/i18n/pt-br.tsv b/crates/ui-egui/src/i18n/pt-br.tsv
index 467c1a278c..8399910802 100644
--- a/crates/ui-egui/src/i18n/pt-br.tsv
+++ b/crates/ui-egui/src/i18n/pt-br.tsv
@@ -2978,4 +2978,13 @@ cameraData	Lens	Lente
 	Snap to Origin	Ajustar à origem
 	Search settings…	Pesquisar configurações…
 	No matching settings	Nenhuma configuração encontrada
+# Select and Mask view modes (#1754)
+	Onion Skin	Papel vegetal
+	Marching Ants	Formigas marchando
+	On Black	Sobre preto
+	On White	Sobre branco
+	On Layers	Sobre camadas
+	Show Edge	Mostrar borda
+	Show Original	Mostrar original
+	F cycles the views; hold X to see the image	F alterna as visualizações; segure X para ver a imagem
 	Show rulers	Mostrar réguas
diff --git a/crates/ui-egui/src/i18n/ru.tsv b/crates/ui-egui/src/i18n/ru.tsv
index ccc1fa0d82..0188128491 100644
--- a/crates/ui-egui/src/i18n/ru.tsv
+++ b/crates/ui-egui/src/i18n/ru.tsv
@@ -2894,6 +2894,15 @@ cameraData	Lens	Объектив
 	Rasterize Layer Style	Растрировать стиль слоя
 	Search settings…	Поиск настроек…
 	No matching settings	Нет подходящих настроек
+# Select and Mask view modes (#1754)
+	Onion Skin	Калька
+	Marching Ants	Бегущие муравьи
+	On Black	На черном
+	On White	На белом
+	On Layers	На слоях
+	Show Edge	Показать край
+	Show Original	Показать исходное
+	F cycles the views; hold X to see the image	F переключает виды; удерживайте X, чтобы увидеть изображение
 	Show rulers	Показать линейки
 	New Crop Preset…	Новый набор параметров кадрирования…
 	Delete Crop Preset…	Удалить набор параметров кадрирования…
diff --git a/crates/ui-egui/src/i18n/uk.tsv b/crates/ui-egui/src/i18n/uk.tsv
index 1c2f27e22e..421c02790b 100644
--- a/crates/ui-egui/src/i18n/uk.tsv
+++ b/crates/ui-egui/src/i18n/uk.tsv
@@ -3644,6 +3644,15 @@ cameraData	Lens	Об'єктив
 	Search settings…	Пошук налаштувань…
 	No matching settings	Немає відповідних налаштувань
 	PhotoCraft — Screen Color Picker	PhotoCraft — Піпетка кольору екрана
+# Select and Mask view modes (#1754)
+	Onion Skin	Калька
+	Marching Ants	Мурашки
+	On Black	На чорному
+	On White	На білому
+	On Layers	На шарах
+	Show Edge	Показати край
+	Show Original	Показати початкове
+	F cycles the views; hold X to see the image	F перемикає види; утримуйте X, щоб побачити зображення
 	Show rulers	Показати лінійки
 	Frame Tool	Інструмент «Рамка»
 	Create a new rectangular frame	Створити прямокутну рамку
diff --git a/crates/ui-egui/src/i18n/zh-hans.tsv b/crates/ui-egui/src/i18n/zh-hans.tsv
index 45fea1505d..6332b3e087 100644
--- a/crates/ui-egui/src/i18n/zh-hans.tsv
+++ b/crates/ui-egui/src/i18n/zh-hans.tsv
@@ -2563,6 +2563,15 @@ cameraData	Lens	镜头
 	Snap to Origin	贴紧原点
 	Search settings…	搜索设置…
 	No matching settings	没有匹配的设置
+# Select and Mask view modes (#1754)
+	Onion Skin	洋葱皮
+	Marching Ants	蚂蚁线
+	On Black	黑底
+	On White	白底
+	On Layers	图层上
+	Show Edge	显示边缘
+	Show Original	显示原始
+	F cycles the views; hold X to see the image	按 F 切换视图；按住 X 查看图像
 	Show rulers	显示标尺
 	New Crop Preset…	新建裁剪预设…
 	Delete Crop Preset…	删除裁剪预设…
diff --git a/crates/ui-egui/src/i18n/zh-hant.tsv b/crates/ui-egui/src/i18n/zh-hant.tsv
index 0ba5d78a6e..2c5a5dd0f2 100644
--- a/crates/ui-egui/src/i18n/zh-hant.tsv
+++ b/crates/ui-egui/src/i18n/zh-hant.tsv
@@ -2533,6 +2533,15 @@ cameraData	Lens	鏡頭
 	Snap to Origin	靠齊原點
 	Search settings…	搜尋設定…
 	No matching settings	沒有符合的設定
+# Select and Mask view modes (#1754)
+	Onion Skin	洋蔥皮
+	Marching Ants	螞蟻線
+	On Black	黑底
+	On White	白底
+	On Layers	圖層上
+	Show Edge	顯示邊緣
+	Show Original	顯示原始
+	F cycles the views; hold X to see the image	按 F 切換檢視；按住 X 檢視影像
 	Show rulers	顯示尺標
 	New Crop Preset…	新增裁切預設集…
 	Delete Crop Preset…	刪除裁切預設集…
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index 39ca677e73..e77681ec92 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -149,6 +149,7 @@ pub mod rotate_view;
 pub mod rulers;
 pub mod screen_picker;
 pub mod scrollbars;
+pub mod select_mask_view;
 pub mod served_fonts;
 pub mod shape_dialog;
 pub(crate) mod shape_fill_ui;
diff --git a/crates/ui-egui/src/select_mask_view.rs b/crates/ui-egui/src/select_mask_view.rs
new file mode 100644
index 0000000000..ffd9da7453
--- /dev/null
+++ b/crates/ui-egui/src/select_mask_view.rs
@@ -0,0 +1,488 @@
+//! Select and Mask view modes (#1754): how the live preview shows the refined selection.
+//!
+//! Photoshop's View Mode list: Onion Skin (O), Marching Ants (M), Overlay (V), On Black (A),
+//! On White (T), Black & White (K) and On Layers (Y), with an Opacity for the first four that
+//! veil the unselected area. F cycles the views, holding X shows the image without one, J toggles
+//! Show Edge (the band the edge detection radius refines) and P Show Original (the selection
+//! before refinement).
+//!
+//! The view state lives in the dialog's fields (`__view`, `__opacity`, `__showEdge`,
+//! `__showOriginal`, `__hideView`), so `ui.dialog.set` drives it like any other field. The preview
+//! runs `select.refineEdge` on the proxy document with `output: selection`, then builds the view
+//! from that proxy (veil fill layers, a layer mask, the refined selection for the ants) and the
+//! normal filter-preview path composites it.
+
+use std::sync::Arc;
+
+use photocraft_color::{Color, PixelFormat};
+use photocraft_doc::{Document, Fill, Layer, LayerContent, LayerId, LayerMask};
+use photocraft_geom::Rect;
+use photocraft_raster::Surface;
+use serde_json::{Map, Value, json};
+
+use crate::PhotocraftApp;
+use crate::theme::Tokens;
+
+/// The engine command behind Select › Select and Mask….
+pub const COMMAND: &str = "select.refineEdge";
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub enum Mode {
+    OnionSkin,
+    MarchingAnts,
+    Overlay,
+    OnBlack,
+    OnWhite,
+    BlackWhite,
+    OnLayers,
+}
+
+impl Mode {
+    /// In menu order, which is also the order F cycles through.
+    pub const ALL: [Mode; 7] = [Mode::OnionSkin, Mode::MarchingAnts, Mode::Overlay, Mode::OnBlack, Mode::OnWhite, Mode::BlackWhite, Mode::OnLayers];
+
+    pub fn id(self) -> &'static str {
+        match self {
+            Mode::OnionSkin => "onionSkin",
+            Mode::MarchingAnts => "marchingAnts",
+            Mode::Overlay => "overlay",
+            Mode::OnBlack => "onBlack",
+            Mode::OnWhite => "onWhite",
+            Mode::BlackWhite => "blackWhite",
+            Mode::OnLayers => "onLayers",
+        }
+    }
+
+    pub fn from_id(id: &str) -> Option<Mode> {
+        Mode::ALL.into_iter().find(|m| m.id() == id)
+    }
+
+    fn label(self) -> &'static str {
+        match self {
+            Mode::OnionSkin => tl!("Onion Skin"),
+            Mode::MarchingAnts => tl!("Marching Ants"),
+            Mode::Overlay => tl!("Overlay"),
+            Mode::OnBlack => tl!("On Black"),
+            Mode::OnWhite => tl!("On White"),
+            Mode::BlackWhite => tl!("Black & White"),
+            Mode::OnLayers => tl!("On Layers"),
+        }
+    }
+
+    /// The single-letter key that picks this view.
+    fn key(self) -> egui::Key {
+        match self {
+            Mode::OnionSkin => egui::Key::O,
+            Mode::MarchingAnts => egui::Key::M,
+            Mode::Overlay => egui::Key::V,
+            Mode::OnBlack => egui::Key::A,
+            Mode::OnWhite => egui::Key::T,
+            Mode::BlackWhite => egui::Key::K,
+            Mode::OnLayers => egui::Key::Y,
+        }
+    }
+
+    /// The view's opacity (percent) until it is changed; `None` for views without one.
+    fn default_opacity(self) -> Option<f32> {
+        match self {
+            Mode::OnionSkin | Mode::Overlay => Some(50.0),
+            Mode::OnBlack | Mode::OnWhite => Some(100.0),
+            Mode::MarchingAnts | Mode::BlackWhite | Mode::OnLayers => None,
+        }
+    }
+
+    fn next(self) -> Mode {
+        let i = Mode::ALL.iter().position(|m| *m == self).unwrap_or(0);
+        Mode::ALL.get(i + 1).copied().unwrap_or(Mode::OnionSkin)
+    }
+}
+
+/// The view the dialog shows (Onion Skin, Photoshop's default, until another is picked).
+pub fn mode(fields: &Map<String, Value>) -> Mode {
+    fields.get("__view").and_then(Value::as_str).and_then(Mode::from_id).unwrap_or(Mode::OnionSkin)
+}
+
+fn flag(fields: &Map<String, Value>, key: &str) -> bool {
+    fields.get(key).and_then(Value::as_bool).unwrap_or(false)
+}
+
+/// The opacity (percent) of `mode`: each view keeps its own, as in Photoshop.
+fn opacity(fields: &Map<String, Value>, mode: Mode) -> f32 {
+    let set = fields.get("__opacity").and_then(|o| o.get(mode.id())).and_then(Value::as_f64).filter(|v| v.is_finite());
+    set.map(|v| v as f32).or(mode.default_opacity()).unwrap_or(100.0).clamp(0.0, 100.0)
+}
+
+fn set_opacity(fields: &mut Map<String, Value>, mode: Mode, value: f32) {
+    let mut all = fields.get("__opacity").and_then(Value::as_object).cloned().unwrap_or_default();
+    all.insert(mode.id().into(), json!(value));
+    fields.insert("__opacity".into(), Value::Object(all));
+}
+
+/// Holding X shows the image without the view.
+pub fn hides_view(fields: &Map<String, Value>) -> bool {
+    flag(fields, "__hideView")
+}
+
+/// Whether `fields` belong to the Select and Mask dialog.
+pub fn owns(fields: &Map<String, Value>) -> bool {
+    fields.get("__command").and_then(Value::as_str) == Some(COMMAND)
+}
+
+/// A view key pressed in the dialog: a view letter picks that view, F the next one, J toggles
+/// Show Edge and P Show Original. Returns whether the key was one of them.
+pub fn apply_key(fields: &mut Map<String, Value>, key: egui::Key) -> bool {
+    if key == egui::Key::F {
+        fields.insert("__view".into(), json!(mode(fields).next().id()));
+    } else if let Some(m) = Mode::ALL.into_iter().find(|m| m.key() == key) {
+        fields.insert("__view".into(), json!(m.id()));
+    } else if key == egui::Key::J || key == egui::Key::P {
+        let field = if key == egui::Key::J { "__showEdge" } else { "__showOriginal" };
+        fields.insert(field.into(), json!(!flag(fields, field)));
+    } else {
+        return false;
+    }
+    true
+}
+
+/// The view keys, unless a text field or a popup (the View dropdown) has the keyboard.
+fn keys(ctx: &egui::Context, fields: &mut Map<String, Value>) {
+    if ctx.text_edit_focused() || egui::Popup::is_any_open(ctx) {
+        fields.insert("__hideView".into(), json!(false));
+        return;
+    }
+    let (pressed, hold_x) = ctx.input(|i| {
+        let plain = !i.modifiers.command && !i.modifiers.ctrl && !i.modifiers.alt;
+        let keys: Vec<egui::Key> = i
+            .events
+            .iter()
+            .filter_map(|e| match e {
+                egui::Event::Key { key, pressed: true, repeat: false, .. } if plain => Some(*key),
+                _ => None,
+            })
+            .collect();
+        (keys, plain && i.key_down(egui::Key::X))
+    });
+    for key in pressed {
+        apply_key(fields, key);
+    }
+    fields.insert("__hideView".into(), json!(hold_x));
+}
+
+/// The View Mode controls at the top of the Select and Mask dialog.
+pub fn controls(ui: &mut egui::Ui, fields: &mut Map<String, Value>) {
+    keys(ui.ctx(), fields);
+    let t = Tokens::get(ui.ctx());
+    let mut current = mode(fields);
+    ui.horizontal(|ui| {
+        ui.label(egui::RichText::new(tl!("View")).color(t.text_dim));
+        let options: Vec<(Mode, &str)> = Mode::ALL.iter().map(|m| (*m, m.label())).collect();
+        crate::widgets::dropdown(ui, "select-mask-view", &mut current, &options, 170.0);
+    });
+    fields.insert("__view".into(), json!(current.id()));
+    if current.default_opacity().is_some() {
+        let mut v = opacity(fields, current);
+        crate::widgets::slider_row(ui, tl!("Opacity"), &mut v, 0.0..=100.0, "%", None);
+        set_opacity(fields, current, v.round());
+    }
+    for (field, label) in [("__showEdge", tl!("Show Edge")), ("__showOriginal", tl!("Show Original"))] {
+        let mut on = flag(fields, field);
+        crate::widgets::checkbox(ui, &mut on, label);
+        fields.insert(field.into(), json!(on));
+    }
+    ui.label(egui::RichText::new(tl!("F cycles the views; hold X to see the image")).color(t.text_dim).small());
+    ui.add_space(4.0);
+    crate::widgets::hairline(ui);
+    ui.add_space(6.0);
+}
+
+/// The preview request: the command's params plus the view (`__view`), so a view change
+/// recomputes the preview like a parameter change.
+pub fn request_params(fields: &Map<String, Value>, mut params: Value) -> Value {
+    let m = mode(fields);
+    if let Some(o) = params.as_object_mut() {
+        o.insert(
+            "__view".into(),
+            json!({
+                "mode": m.id(),
+                "opacity": opacity(fields, m) / 100.0,
+                "showEdge": flag(fields, "__showEdge"),
+                "showOriginal": flag(fields, "__showOriginal"),
+            }),
+        );
+    }
+    params
+}
+
+/// What the canvas outlines while Select and Mask previews `idx`: `None` = the document's own
+/// selection (no Select and Mask preview); `Some(None)` = nothing (every view but Marching Ants
+/// hides the ants, as in Photoshop); `Some(Some((proxy, k)))` = the refined selection of the
+/// preview proxy, reduced by `k`.
+pub(crate) fn ants(app: &PhotocraftApp, idx: usize) -> Option<Option<(Arc<Document>, u32)>> {
+    if app.session.active_index() != Some(idx) {
+        return None;
+    }
+    let d = app.ui.dialogs.iter().find(|d| d.fields.contains_key("__filter"))?;
+    if !owns(&d.fields) || !flag(&d.fields, "__preview") || hides_view(&d.fields) {
+        return None;
+    }
+    if mode(&d.fields) != Mode::MarchingAnts {
+        return Some(None);
+    }
+    let p = app.filter_preview.as_ref().filter(|p| p.key.command == COMMAND && p.key.dialog == d.id)?;
+    Some(Some((p.result.clone()?, p.key.k)))
+}
+
+/// A one-channel coverage over the canvas: `values` inside `area`, `outside` elsewhere.
+struct Coverage {
+    area: Rect,
+    values: Vec<f32>,
+    outside: f32,
+}
+
+impl Coverage {
+    fn empty() -> Coverage {
+        Coverage { area: Rect::EMPTY, values: Vec::new(), outside: 0.0 }
+    }
+
+    /// `s` (a selection or a layer mask) read over the part of `canvas` that isn't its default.
+    fn read(s: Option<&Surface>, canvas: Rect) -> Coverage {
+        let Some(s) = s else { return Coverage::empty() };
+        let outside = s.default_pixel().first().copied().unwrap_or(0.0).clamp(0.0, 1.0);
+        let area = if outside == 0.0 { s.content_bounds().intersect(&canvas) } else { canvas };
+        Coverage { area, values: photocraft_algo::selection::mask_from_surface(Some(s), area), outside }
+    }
+
+    /// The band `r` px either side of the edge of `s`: where grown and shrunk coverage differ.
+    fn edge_band(s: Option<&Surface>, canvas: Rect, r: usize) -> Coverage {
+        let Some(s) = s else { return Coverage::empty() };
+        let reach = i32::try_from(r).unwrap_or(i32::MAX).saturating_add(1);
+        let outside = s.default_pixel().first().copied().unwrap_or(0.0);
+        let area = if outside == 0.0 { s.content_bounds().inflate(reach).intersect(&canvas) } else { canvas };
+        let (w, h) = (area.width() as usize, area.height() as usize);
+        let values = photocraft_algo::selection::mask_from_surface(Some(s), area);
+        let grown = photocraft_algo::matting::morph(&values, w, h, r, true);
+        let shrunk = photocraft_algo::matting::morph(&values, w, h, r, false);
+        if grown.len() != values.len() || shrunk.len() != values.len() {
+            return Coverage::empty();
+        }
+        Coverage { area, values: grown.iter().zip(&shrunk).map(|(g, s)| (g - s).clamp(0.0, 1.0)).collect(), outside: 0.0 }
+    }
+
+    /// A GRAY8 mask surface holding `f(coverage)`.
+    fn surface(&self, f: impl Fn(f32) -> f32) -> Surface {
+        let g = |v: f32| f(v).clamp(0.0, 1.0);
+        let mut s = Surface::with_default(PixelFormat::GRAY8, &[g(self.outside)]);
+        if !self.area.is_empty() && self.values.len() == self.area.width() as usize * self.area.height() as usize {
+            let bytes: Vec<u8> = self.values.iter().map(|v| (g(*v) * 255.0).round() as u8).collect();
+            s.write_interleaved(self.area, &bytes);
+        }
+        s
+    }
+}
+
+/// The view parameters a preview request carries (see [`request_params`]).
+struct View {
+    mode: Mode,
+    opacity: f32,
+    show_edge: bool,
+    show_original: bool,
+}
+
+impl View {
+    fn of(params: &Value) -> View {
+        let v = params.get("__view");
+        let b = |key: &str| v.and_then(|v| v.get(key)).and_then(Value::as_bool).unwrap_or(false);
+        View {
+            mode: v.and_then(|v| v.get("mode")).and_then(Value::as_str).and_then(Mode::from_id).unwrap_or(Mode::OnionSkin),
+            opacity: v.and_then(|v| v.get("opacity")).and_then(Value::as_f64).filter(|o| o.is_finite()).unwrap_or(0.5).clamp(0.0, 1.0) as f32,
+            show_edge: b("showEdge"),
+            show_original: b("showOriginal"),
+        }
+    }
+}
+
+/// A pixel length param (`radius`, `feather`) of `params`, reduced by `k`.
+fn length(params: &Value, key: &str, k: u32) -> f64 {
+    params.get(key).and_then(Value::as_f64).filter(|v| v.is_finite()).unwrap_or(0.0).max(0.0) / f64::from(k.max(1))
+}
+
+/// The preview of the Select and Mask dialog for `doc`: the proxy reduced by `k`, shown in the
+/// requested view. `None` when the refinement fails or is cancelled.
+pub fn preview_document(doc: &Document, active: Option<LayerId>, params: &Value, k: u32, cancel: Option<&photocraft_engine::jobs::JobCtx>) -> Option<Document> {
+    let view = View::of(params);
+    let k = k.max(1);
+    let mut proxy = crate::proxy::proxy_document(doc, k);
+    let active = active.filter(|id| proxy.layer(*id).is_some());
+    // What Select and Mask starts from: the selection, else the active layer's mask.
+    let original = proxy.selection.clone().or_else(|| active.and_then(|id| proxy.layer(id)).and_then(|l| l.mask.as_ref()).map(|m| m.surface.clone()));
+    let canvas = Rect::new(0, 0, i32::try_from(proxy.size.width).unwrap_or(i32::MAX), i32::try_from(proxy.size.height).unwrap_or(i32::MAX));
+    let coverage = if view.show_edge {
+        Coverage::edge_band(original.as_ref(), canvas, length(params, "radius", k).round().clamp(1.0, 250.0) as usize)
+    } else if view.show_original {
+        Coverage::read(original.as_ref(), canvas)
+    } else {
+        Coverage::read(refine(&proxy, active, params, k, cancel)?.as_ref(), canvas)
+    };
+    show(&mut proxy, active, &view, &coverage);
+    Some(proxy)
+}
+
+/// `select.refineEdge` on the proxy, its output forced to the selection: the refined coverage.
+fn refine(proxy: &Document, active: Option<LayerId>, params: &Value, k: u32, cancel: Option<&photocraft_engine::jobs::JobCtx>) -> Option<Option<Surface>> {
+    let mut s = photocraft_engine::Session::new();
+    s.set_inline_job_ctx(cancel.cloned());
+    s.add_document(proxy.clone(), None);
+    if let Some(id) = active {
+        s.select_layer(id).ok()?;
+    }
+    let mut p = params.as_object().cloned().unwrap_or_default();
+    p.remove("__view");
+    p.insert("output".into(), json!("selection"));
+    p.insert("decontaminate".into(), json!(false));
+    for key in ["radius", "feather"] {
+        if p.contains_key(key) {
+            p.insert(key.into(), json!(length(params, key, k)));
+        }
+    }
+    s.execute(COMMAND, Value::Object(p)).ok()?;
+    Some(s.active()?.doc.selection.clone())
+}
+
+/// A solid fill layer named for the view.
+fn veil(name: &str, color: Color, opacity: f32, mask: Option<Surface>) -> Layer {
+    let mut l = Layer::new(name, LayerContent::Fill(Fill::Solid(color)));
+    l.opacity = opacity;
+    l.mask = mask.map(|surface| LayerMask { surface, ..LayerMask::reveal_all() });
+    l
+}
+
+/// Turn `doc` into `view` of `coverage`.
+fn show(doc: &mut Document, active: Option<LayerId>, view: &View, coverage: &Coverage) {
+    let o = view.opacity;
+    doc.selection = Some(coverage.surface(|v| v));
+    match view.mode {
+        Mode::MarchingAnts => {}
+        Mode::Overlay => doc.layers.push(veil("Overlay", Color::rgb(1.0, 0.0, 0.0), o, Some(coverage.surface(|v| 1.0 - v)))),
+        Mode::OnBlack => doc.layers.push(veil("On Black", Color::BLACK, o, Some(coverage.surface(|v| 1.0 - v)))),
+        Mode::OnWhite => doc.layers.push(veil("On White", Color::WHITE, o, Some(coverage.surface(|v| 1.0 - v)))),
+        Mode::BlackWhite => {
+            doc.layers.push(veil("Black", Color::BLACK, 1.0, None));
+            doc.layers.push(veil("White", Color::WHITE, 1.0, Some(coverage.surface(|v| v))));
+        }
+        Mode::OnLayers | Mode::OnionSkin => {
+            let Some(id) = active else { return };
+            if view.mode == Mode::OnionSkin
+                && let Some(path) = doc.path_of(id)
+            {
+                // Only the layer being masked (with its groups and contents) stays visible.
+                let others: Vec<LayerId> =
+                    doc.walk().into_iter().filter(|(p, _, _)| !path.starts_with(p) && !p.starts_with(&path)).map(|(_, _, l)| l.id).collect();
+                for other in others {
+                    if let Some(l) = doc.layer_mut(other) {
+                        l.visible = false;
+                    }
+                }
+            }
+            let keep = if view.mode == Mode::OnionSkin { 1.0 - o } else { 0.0 };
+            let surface = coverage.surface(|v| v + (1.0 - v) * keep);
+            if let Some(l) = doc.layer_mut(id) {
+                l.mask = Some(LayerMask { surface, ..LayerMask::reveal_all() });
+            }
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use photocraft_color::{ColorMode, SampleType};
+    use photocraft_doc::Size;
+
+    /// A white 40×20 document with its left half selected.
+    fn half_selected() -> Document {
+        let mut doc = Document::with_background("d", Size::new(40, 20), ColorMode::Rgb, SampleType::U8, Color::WHITE);
+        let mut sel = Surface::new(PixelFormat::GRAY8);
+        sel.fill_rect(Rect::new(0, 0, 20, 20), &[1.0]);
+        doc.selection = Some(sel);
+        doc
+    }
+
+    fn view(mode: Mode) -> Value {
+        json!({"radius": 0, "__view": {"mode": mode.id(), "opacity": 0.5, "showEdge": false, "showOriginal": false}})
+    }
+
+    fn pixel(doc: &Document, x: i32, y: i32) -> Vec<f32> {
+        let s = photocraft_compose::flatten_to_surface(doc, PixelFormat::RGBA8, None);
+        s.pixel(x, y)
+    }
+
+    /// Every view shows the selected half as the image and marks the rest its own way.
+    #[test]
+    fn each_view_marks_the_unselected_area() {
+        let doc = half_selected();
+        let active = doc.layers.first().map(|l| l.id);
+        let near = |a: &[f32], b: &[f32]| a.iter().zip(b).all(|(a, b)| (a - b).abs() < 0.02);
+        let cases = [
+            (Mode::Overlay, [1.0, 0.5, 0.5, 1.0]),
+            (Mode::OnBlack, [0.5, 0.5, 0.5, 1.0]),
+            (Mode::OnWhite, [1.0, 1.0, 1.0, 1.0]),
+            (Mode::BlackWhite, [0.0, 0.0, 0.0, 1.0]),
+            (Mode::OnLayers, [0.0, 0.0, 0.0, 0.0]),
+            (Mode::OnionSkin, [1.0, 1.0, 1.0, 0.5]),
+            (Mode::MarchingAnts, [1.0, 1.0, 1.0, 1.0]),
+        ];
+        for (mode, unselected) in cases {
+            // Through the filter dialog's preview, which every Select and Mask preview takes.
+            let shown = crate::filter_dialog::preview_document(&doc, active, COMMAND, &view(mode), 1).expect("a preview");
+            let inside = pixel(&shown, 5, 10);
+            assert!(near(&inside, &[1.0, 1.0, 1.0, 1.0]), "{mode:?}: selected area {inside:?}");
+            let outside = pixel(&shown, 35, 10);
+            assert!(near(&outside, &unselected), "{mode:?}: unselected area {outside:?}, want {unselected:?}");
+            // The refined selection rides along for the canvas's marching ants.
+            assert!(shown.selection.as_ref().is_some_and(|s| s.pixel(5, 10)[0] > 0.99 && s.pixel(35, 10)[0] < 0.01), "{mode:?}");
+        }
+    }
+
+    #[test]
+    fn view_keys_pick_cycle_and_toggle() {
+        let mut f = Map::new();
+        assert_eq!(mode(&f), Mode::OnionSkin, "Photoshop's default view");
+        assert!(apply_key(&mut f, egui::Key::V));
+        assert_eq!(mode(&f), Mode::Overlay);
+        for want in [Mode::OnBlack, Mode::OnWhite, Mode::BlackWhite, Mode::OnLayers, Mode::OnionSkin, Mode::MarchingAnts] {
+            apply_key(&mut f, egui::Key::F);
+            assert_eq!(mode(&f), want, "F cycles");
+        }
+        apply_key(&mut f, egui::Key::J);
+        apply_key(&mut f, egui::Key::P);
+        assert!(flag(&f, "__showEdge") && flag(&f, "__showOriginal"));
+        apply_key(&mut f, egui::Key::J);
+        assert!(!flag(&f, "__showEdge"));
+        assert!(!apply_key(&mut f, egui::Key::Q), "other keys are left alone");
+        // Each view keeps its own opacity; hostile values fall back to the default.
+        set_opacity(&mut f, Mode::Overlay, 80.0);
+        assert_eq!((opacity(&f, Mode::Overlay), opacity(&f, Mode::OnBlack)), (80.0, 100.0));
+        f.insert("__opacity".into(), json!({"overlay": "x"}));
+        assert_eq!(opacity(&f, Mode::Overlay), 50.0);
+        // The view travels with the preview request, and a hostile one still previews.
+        let p = request_params(&f, json!({"radius": 2}));
+        assert_eq!(p["__view"]["mode"], json!("marchingAnts"));
+        let doc = half_selected();
+        let bad = json!({"radius": -5, "feather": "x", "__view": {"mode": 7, "opacity": "nan"}});
+        assert!(preview_document(&doc, None, &bad, 3, None).is_some());
+    }
+
+    /// Show Edge shows the band around the selection's edge; Show Original the unrefined selection.
+    #[test]
+    fn show_edge_and_show_original() {
+        let doc = half_selected();
+        let active = doc.layers.first().map(|l| l.id);
+        let edge = json!({"radius": 3, "smooth": 100, "__view": {"mode": "blackWhite", "opacity": 0.5, "showEdge": true}});
+        let shown = preview_document(&doc, active, &edge, 1, None).expect("a preview");
+        assert!(pixel(&shown, 20, 10)[0] > 0.99, "on the edge");
+        assert!(pixel(&shown, 5, 10)[0] < 0.01 && pixel(&shown, 35, 10)[0] < 0.01, "away from it");
+        let original = json!({"radius": 3, "shiftEdge": 100, "__view": {"mode": "blackWhite", "showOriginal": true}});
+        let shown = preview_document(&doc, active, &original, 1, None).expect("a preview");
+        assert!(pixel(&shown, 19, 10)[0] > 0.99 && pixel(&shown, 21, 10)[0] < 0.01, "the selection as it was");
+    }
+}
diff --git a/docs/gaps.md b/docs/gaps.md
index a2ec3dddc4..c4417fbf9d 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -65,8 +65,8 @@ what an agent can't finish alone.
 - **Estimate:** 60–100 h (2–9 h each, per the calibration).
 
 ### G7. Workspaces shown as parameter dialogs
-- **Missing:** Select and Mask workspace with view modes, Refine Edge brush and outputs
-  (TOOL-214-1, Refine Hair #2671); Content-Aware Fill workspace with a paintable sampling area
+- **Missing:** Select and Mask workspace layout, Refine Edge brush and outputs
+  (TOOL-214-1, Refine Hair #2671; its view modes preview live since #1754); Content-Aware Fill workspace with a paintable sampling area
   (TOOL-214-15); Vanishing Point plane editor (TOOL-214-14); Content-Aware Scale through the
   transform box (TOOL-214-7); Puppet Warp mesh following the outline (TOOL-214-6); Content-Aware
   Move's Transform On Drop (TOOL-213-4).
diff --git a/docs/scorecard.md b/docs/scorecard.md
index c0c15c3187..6f9b4237c4 100644
--- a/docs/scorecard.md
+++ b/docs/scorecard.md
@@ -145,7 +145,7 @@ Corpus floors (`crates/io/tests/corpus.rs`): the enforced minimums; the corpus t
 | TOOL-213-13 | Brush regression tests: no seams, hard edge, zero-scatter defaults, ABR never black | done | [#213](https://github.com/storytold/photocraft/issues/213) | Seam, hard-edge and zero-scatter tests in brush_tests.rs; ABR tip colour test in abr_map/tests.rs |
 | TOOL-213-14 | Tablet: no OS arrow cursor over the canvas on macOS, Windows and Linux | partial | [#213](https://github.com/storytold/photocraft/issues/213) | Brush tools set CursorIcon::None (canvas.rs:1259-1275); not verified per OS |
 | TOOL-213-18 | Pattern Stamp tool: sibling of Clone Stamp in the S flyout | done | [#213](https://github.com/storytold/photocraft/issues/213) | Tool::PatternStamp in the S group; paint.patternStamp stamps the Patterns-panel tile with Aligned and Impressionist (an approximation: it jitters each dab's tile phase, not Photoshop's smeared impressionist look); engine tests cover depths, seams, hostile input |
-| TOOL-214-1 | Select and Mask workspace: view modes, Refine Edge brush, 6 outputs | partial | [#214](https://github.com/storytold/photocraft/issues/214) | Opens the generic select.refineEdge dialog (menus.rs:308) |
+| TOOL-214-1 | Select and Mask workspace: view modes, Refine Edge brush, 6 outputs | partial | [#214](https://github.com/storytold/photocraft/issues/214) | select.refineEdge dialog with a live preview in Photoshop's view modes: Onion Skin, Marching Ants, Overlay, On Black, On White, Black & White, On Layers, per-view Opacity, Show Edge (J), Show Original (P), F cycles, X shows the image (select_mask_view.rs, #1754); no workspace layout or Refine Edge brush |
 | TOOL-214-2 | Marquee: Shift square, Alt from centre, live W x H readout | done | [#214](https://github.com/storytold/photocraft/issues/214) | canvas.rs marquee_corners: Shift square or circle, Alt from the centre, live W x H readout beside the cursor (marquee_readout); marquee_tests.rs |
 | TOOL-214-3 | Color Range test: Sampled Colors at Fuzziness 0 selects the exact match only | partial | [#214](https://github.com/storytold/photocraft/issues/214) | Fuzziness-0 tests cover midtones/shadows only (selection_cmds.rs:444-447) |
 | TOOL-214-4 | Move tool: box-select layers, Auto-Select hover outline, double-click fit, drag to a tab | partial | [#214](https://github.com/storytold/photocraft/issues/214) | Auto-Select hover outline (Preferences › Tools › Show Highlight on Rollover, #2834) and box-select layers from an empty spot (move_box.rs, layer.selectInRect, #2844) done; double-click fit and drag to a tab open |
diff --git a/scorecard/tools.toml b/scorecard/tools.toml
index 6c9f5f8d55..158c78169e 100644
--- a/scorecard/tools.toml
+++ b/scorecard/tools.toml
@@ -115,7 +115,7 @@ id = "TOOL-214-1"
 target = "Select and Mask workspace: view modes, Refine Edge brush, 6 outputs"
 status = "partial"
 issue = 214
-note = "Opens the generic select.refineEdge dialog (menus.rs:308)"
+note = "select.refineEdge dialog with a live preview in Photoshop's view modes: Onion Skin, Marching Ants, Overlay, On Black, On White, Black & White, On Layers, per-view Opacity, Show Edge (J), Show Original (P), F cycles, X shows the image (select_mask_view.rs, #1754); no workspace layout or Refine Edge brush"
 
 [[item]]
 id = "TOOL-214-2"