diff --git a/src-tauri/src/lib.rs b/src-tauri/src/lib.rs
index c99c561..977af33 100644
--- a/src-tauri/src/lib.rs
+++ b/src-tauri/src/lib.rs
@@ -335,11 +335,125 @@ fn get_zca_suggestion(path: String) -> Result<ZcaResult, String> {
     calculate_zca_internal(&img)
 }
 
+#[derive(serde::Serialize)]
+struct DetectionResult {
+    rects: Vec<Rect>,
+}
+
+#[derive(serde::Serialize, Clone)]
+struct Rect {
+    x: f64,
+    y: f64,
+    width: f64,
+    height: f64,
+}
+
+#[tauri::command]
+async fn detect_watermark(path: String) -> Result<DetectionResult, String> {
+    let img = image::open(&path).map_err(|e| e.to_string())?;
+    let (width, height) = img.dimensions();
+    let gray = img.to_luma8();
+    
+    // Heuristic:
+    // 1. Scan Top 20% and Bottom 20%
+    // 2. Look for high brightness pixels (> 230)
+    // 3. Grid based clustering
+    
+    let cell_size = 10;
+    let grid_w = (width + cell_size - 1) / cell_size;
+    let grid_h = (height + cell_size - 1) / cell_size;
+    let mut grid = vec![false; (grid_w * grid_h) as usize];
+
+    let top_limit = (height as f64 * 0.2) as u32;
+    let bottom_start = (height as f64 * 0.8) as u32;
+
+    for y in 0..height {
+        // Skip middle section
+        if y > top_limit && y < bottom_start {
+            continue;
+        }
+
+        for x in 0..width {
+            let p = gray.get_pixel(x, y);
+            if p[0] > 230 { // High brightness threshold
+                // Check local contrast/edges? 
+                // For now, simple brightness is a good proxy for "white text"
+                // Mark grid cell
+                let gx = x / cell_size;
+                let gy = y / cell_size;
+                grid[(gy * grid_w + gx) as usize] = true;
+            }
+        }
+    }
+
+    // Connected Components on Grid (Simple merging)
+    let mut rects = Vec::new();
+    let mut visited = vec![false; grid.len()];
+
+    for gy in 0..grid_h {
+        for gx in 0..grid_w {
+            let idx = (gy * grid_w + gx) as usize;
+            if grid[idx] && !visited[idx] {
+                // Start a new component
+                // Simple Flood Fill or just greedy expansion
+                // Let's do a simple greedy expansion for rectangles
+                
+                let mut min_gx = gx;
+                let mut max_gx = gx;
+                let mut min_gy = gy;
+                let mut max_gy = gy;
+                
+                let mut stack = vec![(gx, gy)];
+                visited[idx] = true;
+
+                while let Some((cx, cy)) = stack.pop() {
+                    if cx < min_gx { min_gx = cx; }
+                    if cx > max_gx { max_gx = cx; }
+                    if cy < min_gy { min_gy = cy; }
+                    if cy > max_gy { max_gy = cy; }
+
+                    // Neighbors
+                    let neighbors = [
+                        (cx.wrapping_sub(1), cy), (cx + 1, cy),
+                        (cx, cy.wrapping_sub(1)), (cx, cy + 1)
+                    ];
+
+                    for (nx, ny) in neighbors {
+                        if nx < grid_w && ny < grid_h {
+                            let nidx = (ny * grid_w + nx) as usize;
+                            if grid[nidx] && !visited[nidx] {
+                                visited[nidx] = true;
+                                stack.push((nx, ny));
+                            }
+                        }
+                    }
+                }
+
+                // Convert grid rect to normalized image rect
+                // Add padding (1 cell)
+                let px = (min_gx * cell_size) as f64;
+                let py = (min_gy * cell_size) as f64;
+                let pw = ((max_gx - min_gx + 1) * cell_size) as f64;
+                let ph = ((max_gy - min_gy + 1) * cell_size) as f64;
+
+                rects.push(Rect {
+                    x: px / width as f64,
+                    y: py / height as f64,
+                    width: pw / width as f64,
+                    height: ph / height as f64,
+                });
+            }
+        }
+    }
+
+    Ok(DetectionResult { rects })
+}
+
 #[cfg_attr(mobile, tauri::mobile_entry_point)]
 pub fn run() {
     tauri::Builder::default()
         .plugin(tauri_plugin_dialog::init())
-        .invoke_handler(tauri::generate_handler![scan_dir, get_zca_suggestion, export_batch])
+        .invoke_handler(tauri::generate_handler![scan_dir, get_zca_suggestion, export_batch, detect_watermark])
         .run(tauri::generate_context!())
         .expect("error while running tauri application");
 }
diff --git a/src/components/HeroView.vue b/src/components/HeroView.vue
index 8896cc1..c745d5b 100644
--- a/src/components/HeroView.vue
+++ b/src/components/HeroView.vue
@@ -31,9 +31,6 @@ const calculateLayout = () => {
         (parentW - 64) / natW, // 64px = 2rem padding * 2 sides (p-8)
         (parentH - 64) / natH
     );
-
-    // Prevent scaling up if image is smaller than screen? 
-    // Usually hero view scales up to fit. Let's stick to contain logic (can scale up).
     
     const finalW = Math.floor(natW * scale);
     const finalH = Math.floor(natH * scale);
@@ -77,15 +74,80 @@ const effectiveScale = computed(() => store.selectedImage?.scale ?? store.waterm
 const effectiveOpacity = computed(() => store.selectedImage?.opacity ?? store.watermarkSettings.opacity);
 const effectiveColor = computed(() => store.selectedImage?.color ?? store.watermarkSettings.color);
 
+const canvasRef = ref<HTMLCanvasElement | null>(null);
+const isDrawing = ref(false);
+const currentPath = ref<{x: number, y: number}[]>([]);
+
+// Redraw when strokes change or layout changes
+watch(
+    () => store.selectedImage?.maskStrokes, 
+    () => {
+        nextTick(redrawCanvas);
+    },
+    { deep: true }
+);
+
+watch(imageRect, () => {
+    nextTick(redrawCanvas);
+});
+
+const redrawCanvas = () => {
+    if (!canvasRef.value || !store.selectedImage || imageRect.value.width === 0) return;
+    const ctx = canvasRef.value.getContext('2d');
+    if (!ctx) return;
+    
+    const w = imageRect.value.width;
+    const h = imageRect.value.height;
+
+    ctx.clearRect(0, 0, w, h);
+    
+    if (!store.selectedImage.maskStrokes) return;
+
+    ctx.fillStyle = 'rgba(255, 0, 0, 0.5)';
+    ctx.strokeStyle = 'rgba(255, 0, 0, 0.5)';
+    ctx.lineCap = 'round';
+    ctx.lineJoin = 'round';
+
+    store.selectedImage.maskStrokes.forEach(stroke => {
+        if (stroke.type === 'rect' && stroke.rect) {
+            ctx.fillRect(
+                stroke.rect.x * w, 
+                stroke.rect.y * h, 
+                stroke.rect.w * w, 
+                stroke.rect.h * h
+            );
+        } else if (stroke.type === 'path' && stroke.points) {
+             const lw = (stroke.width || (store.brushSettings.size / w)) * w;
+             ctx.lineWidth = lw; 
+
+             if (stroke.points.length > 0) {
+                 ctx.beginPath();
+                 ctx.moveTo(stroke.points[0].x * w, stroke.points[0].y * h);
+                 for (let i = 1; i < stroke.points.length; i++) {
+                     ctx.lineTo(stroke.points[i].x * w, stroke.points[i].y * h);
+                 }
+                 ctx.stroke();
+             }
+        }
+    });
+};
+
 const onMouseDown = (e: MouseEvent) => {
+    if (store.editMode === 'remove') {
+        startDrawing(e);
+        return;
+    }
     e.preventDefault();
     isDragging.value = true;
     dragStart.value = { x: e.clientX, y: e.clientY };
 };
 
 const onMouseMove = (e: MouseEvent) => {
-    // Need exact dimensions for drag calculation
-    // Use imageRect for calculation as it matches the render size
+    if (store.editMode === 'remove') {
+        draw(e);
+        return;
+    }
+
     if (!isDragging.value || !store.selectedImage || imageRect.value.width === 0) return;
     
     const rect = imageRect.value;
@@ -111,10 +173,59 @@ const onMouseMove = (e: MouseEvent) => {
 
 const onMouseUp = () => {
     isDragging.value = false;
+    stopDrawing();
 };
 
 const onMouseLeave = () => {
     isDragging.value = false;
+    stopDrawing();
+};
+
+// --- Drawing Logic ---
+const startDrawing = (e: MouseEvent) => {
+    if (!canvasRef.value) return;
+    isDrawing.value = true;
+    currentPath.value = [];
+    draw(e);
+};
+
+const draw = (e: MouseEvent) => {
+    if (!isDrawing.value || !canvasRef.value) return;
+    const ctx = canvasRef.value.getContext('2d');
+    if (!ctx) return;
+
+    const rect = canvasRef.value.getBoundingClientRect();
+    const x = e.clientX - rect.left;
+    const y = e.clientY - rect.top;
+
+    // Normalize
+    const nx = x / imageRect.value.width;
+    const ny = y / imageRect.value.height;
+    
+    currentPath.value.push({ x: nx, y: ny });
+
+    // Live feedback (Paint on top of existing)
+    ctx.fillStyle = 'rgba(255, 0, 0, 0.5)';
+    ctx.beginPath();
+    ctx.arc(x, y, store.brushSettings.size / 2, 0, Math.PI * 2);
+    ctx.fill();
+    
+    // Connect dots for smoothness if we have enough points
+    // (Optional optimization: draw line from last point)
+};
+
+const stopDrawing = () => {
+    if (!isDrawing.value) return;
+    isDrawing.value = false;
+    
+    if (currentPath.value.length > 0 && store.selectedIndex >= 0) {
+        const normWidth = store.brushSettings.size / imageRect.value.width;
+        store.addMaskStroke(store.selectedIndex, {
+            type: 'path',
+            points: [...currentPath.value],
+            width: normWidth
+        });
+    }
 };
 </script>
 
@@ -151,9 +262,9 @@ const onMouseLeave = () => {
         @error="(e) => console.error('Hero Image Load Error:', e)"
       />
       
-      <!-- Text Watermark Overlay -->
+      <!-- Text Watermark Overlay (Only in Add Mode) -->
       <div 
-        v-if="store.watermarkSettings.text"
+        v-if="store.editMode === 'add' && store.watermarkSettings.text"
         class="absolute cursor-move select-none whitespace-nowrap font-sans font-medium"
         :style="{
             left: (position.x * 100) + '%',
@@ -166,7 +277,8 @@ const onMouseLeave = () => {
             height: '0px', 
             display: 'flex',
             alignItems: 'center',
-            justifyContent: 'center'
+            justifyContent: 'center',
+            zIndex: 10
         }"
         @mousedown="onMouseDown"
       >
@@ -177,6 +289,16 @@ const onMouseLeave = () => {
         <!-- Selection Ring when dragging -->
         <div v-if="isDragging" class="absolute -inset-2 border border-blue-500 rounded-sm"></div>
       </div>
+
+      <!-- Canvas Overlay (Only in Remove Mode) -->
+      <canvas 
+        v-show="store.editMode === 'remove'"
+        ref="canvasRef"
+        :width="imageRect.width"
+        :height="imageRect.height"
+        class="absolute inset-0 z-20 cursor-crosshair touch-none"
+        @mousedown="onMouseDown"
+      ></canvas>
     </div>
     <div v-else class="text-gray-500 flex flex-col items-center">
       <p>No image selected</p>
diff --git a/src/components/SettingsPanel.vue b/src/components/SettingsPanel.vue
index d768d75..381dd43 100644
--- a/src/components/SettingsPanel.vue
+++ b/src/components/SettingsPanel.vue
@@ -1,6 +1,6 @@
 <script setup lang="ts">
 import { useGalleryStore } from "../stores/gallery";
-import { Settings, CheckSquare, Type, Palette, Copy } from 'lucide-vue-next';
+import { Settings, CheckSquare, Type, Palette, Copy, Eraser, PlusSquare, Brush, Sparkles, Trash2 } from 'lucide-vue-next';
 import { computed } from "vue";
 
 const store = useGalleryStore();
@@ -47,101 +47,171 @@ const applyAll = () => {
 </script>
 
 <template>
-  <div class="h-full bg-gray-800 text-white p-4 flex flex-col gap-6 overflow-y-auto border-l border-gray-700 w-80">
-      <h2 class="text-lg font-bold flex items-center justify-between">
-          <div class="flex items-center gap-2">
-            <Settings class="w-5 h-5" />
-            Settings
-          </div>
+  <div class="h-full bg-gray-800 text-white flex flex-col w-80 border-l border-gray-700">
+      
+      <!-- Mode Switcher Tabs -->
+      <div class="flex border-b border-gray-700">
           <button 
-            @click="applyAll" 
-            title="Apply Settings to All Images"
-            class="bg-gray-700 hover:bg-gray-600 p-1.5 rounded text-xs text-blue-300 transition-colors flex items-center gap-1"
+            @click="store.editMode = 'add'"
+            class="flex-1 py-3 text-sm font-medium flex items-center justify-center gap-2 transition-colors"
+            :class="store.editMode === 'add' ? 'bg-gray-700 text-blue-400 border-b-2 border-blue-400' : 'text-gray-400 hover:bg-gray-750'"
           >
-             <Copy class="w-3 h-3" /> All
+            <PlusSquare class="w-4 h-4" /> Add
+          </button>
+          <button 
+            @click="store.editMode = 'remove'"
+            class="flex-1 py-3 text-sm font-medium flex items-center justify-center gap-2 transition-colors"
+            :class="store.editMode === 'remove' ? 'bg-gray-700 text-red-400 border-b-2 border-red-400' : 'text-gray-400 hover:bg-gray-750'"
+          >
+            <Eraser class="w-4 h-4" /> Remove
           </button>
-      </h2>
-
-      <!-- Text Input -->
-      <div class="flex flex-col gap-2">
-          <label class="text-sm text-gray-400 uppercase tracking-wider font-semibold">Content</label>
-          <div class="relative">
-              <Type class="absolute left-3 top-2.5 w-4 h-4 text-gray-500" />
-              <input 
-                type="text"
-                v-model="store.watermarkSettings.text"
-                class="w-full bg-gray-700 text-white pl-10 pr-3 py-2 rounded border border-gray-600 focus:border-blue-500 focus:outline-none"
-                placeholder="Enter text..."
-              />
-          </div>
       </div>
 
-      <!-- Color Picker -->
-      <div class="flex flex-col gap-2">
-          <label class="text-sm text-gray-400 uppercase tracking-wider font-semibold">Color</label>
-          <div class="flex items-center gap-2 bg-gray-700 p-2 rounded border border-gray-600">
-             <Palette class="w-4 h-4 text-gray-400" />
-             <input 
-                type="color" 
-                v-model="currentColor"
-                class="w-8 h-8 rounded cursor-pointer bg-transparent border-none p-0"
-             />
-             <span class="text-xs text-gray-300 font-mono">{{ currentColor }}</span>
-          </div>
-      </div>
+      <!-- Content Area -->
+      <div class="flex-1 overflow-y-auto p-4 flex flex-col gap-6">
+          
+          <!-- ADD MODE SETTINGS -->
+          <div v-if="store.editMode === 'add'" class="flex flex-col gap-6">
+            <h2 class="text-lg font-bold flex items-center justify-between">
+                <div class="flex items-center gap-2">
+                    <Settings class="w-5 h-5" />
+                    Watermark
+                </div>
+                <button 
+                    @click="applyAll" 
+                    title="Apply Settings to All Images"
+                    class="bg-gray-700 hover:bg-gray-600 p-1.5 rounded text-xs text-blue-300 transition-colors flex items-center gap-1"
+                >
+                    <Copy class="w-3 h-3" /> All
+                </button>
+            </h2>
 
-      <!-- Controls -->
-      <div class="space-y-4">
-           <div>
-              <div class="flex justify-between mb-1">
-                  <label class="text-xs text-gray-400">Size (Scale)</label>
-                  <span class="text-xs text-gray-300">{{ (currentScale * 100).toFixed(1) }}%</span>
-              </div>
-              <input 
-                type="range" 
-                min="0.01" 
-                max="0.20" 
-                step="0.001" 
-                v-model.number="currentScale"
-                class="w-full h-1 bg-gray-600 rounded-lg appearance-none cursor-pointer accent-blue-500"
-              />
-              <p class="text-[10px] text-gray-500 mt-1">Relative to image height</p>
+            <!-- Text Input -->
+            <div class="flex flex-col gap-2">
+                <label class="text-sm text-gray-400 uppercase tracking-wider font-semibold">Content</label>
+                <div class="relative">
+                    <Type class="absolute left-3 top-2.5 w-4 h-4 text-gray-500" />
+                    <input 
+                        type="text"
+                        v-model="store.watermarkSettings.text"
+                        class="w-full bg-gray-700 text-white pl-10 pr-3 py-2 rounded border border-gray-600 focus:border-blue-500 focus:outline-none"
+                        placeholder="Enter text..."
+                    />
+                </div>
+            </div>
+
+            <!-- Color Picker -->
+            <div class="flex flex-col gap-2">
+                <label class="text-sm text-gray-400 uppercase tracking-wider font-semibold">Color</label>
+                <div class="flex items-center gap-2 bg-gray-700 p-2 rounded border border-gray-600">
+                    <Palette class="w-4 h-4 text-gray-400" />
+                    <input 
+                        type="color" 
+                        v-model="currentColor"
+                        class="w-8 h-8 rounded cursor-pointer bg-transparent border-none p-0"
+                    />
+                    <span class="text-xs text-gray-300 font-mono">{{ currentColor }}</span>
+                </div>
+            </div>
+
+            <!-- Controls -->
+            <div class="space-y-4">
+                <div>
+                    <div class="flex justify-between mb-1">
+                        <label class="text-xs text-gray-400">Size (Scale)</label>
+                        <span class="text-xs text-gray-300">{{ (currentScale * 100).toFixed(1) }}%</span>
+                    </div>
+                    <input 
+                        type="range" 
+                        min="0.01" 
+                        max="0.20" 
+                        step="0.001" 
+                        v-model.number="currentScale"
+                        class="w-full h-1 bg-gray-600 rounded-lg appearance-none cursor-pointer accent-blue-500"
+                    />
+                    <p class="text-[10px] text-gray-500 mt-1">Relative to image height</p>
+                </div>
+
+                <div>
+                    <div class="flex justify-between mb-1">
+                        <label class="text-xs text-gray-400">Opacity</label>
+                        <span class="text-xs text-gray-300">{{ (currentOpacity * 100).toFixed(0) }}%</span>
+                    </div>
+                    <input 
+                        type="range" 
+                        min="0.1" 
+                        max="1.0" 
+                        step="0.01" 
+                        v-model.number="currentOpacity"
+                        class="w-full h-1 bg-gray-600 rounded-lg appearance-none cursor-pointer accent-blue-500"
+                    />
+                </div>
+            </div>
+
+            <!-- Placement Info -->
+            <div class="flex flex-col gap-2">
+                <label class="text-sm text-gray-400 uppercase tracking-wider font-semibold">Placement Status</label>
+                <div class="flex items-center gap-2 p-2 rounded bg-gray-700/50 border border-gray-600">
+                    <div class="p-1 rounded bg-green-500/20 text-green-400">
+                        <CheckSquare class="w-4 h-4" v-if="!store.selectedImage?.manualPosition" />
+                        <div class="w-4 h-4" v-else></div>
+                    </div>
+                    <div class="flex-1">
+                        <p class="text-sm font-medium text-gray-200" v-if="!store.selectedImage?.manualPosition">Auto (ZCA)</p>
+                        <p class="text-sm font-medium text-blue-300" v-else>Manual Override</p>
+                    </div>
+                </div>
+            </div>
           </div>
 
-           <div>
-              <div class="flex justify-between mb-1">
-                  <label class="text-xs text-gray-400">Opacity</label>
-                  <span class="text-xs text-gray-300">{{ (currentOpacity * 100).toFixed(0) }}%</span>
-              </div>
-              <input 
-                type="range" 
-                min="0.1" 
-                max="1.0" 
-                step="0.01" 
-                v-model.number="currentOpacity"
-                class="w-full h-1 bg-gray-600 rounded-lg appearance-none cursor-pointer accent-blue-500"
-              />
-          </div>
-      </div>
+          <!-- REMOVE MODE SETTINGS -->
+          <div v-else class="flex flex-col gap-6">
+             <h2 class="text-lg font-bold flex items-center gap-2 text-red-400">
+                <Brush class="w-5 h-5" />
+                Magic Eraser
+            </h2>
 
-      <!-- Placement Mode -->
-       <div class="flex flex-col gap-2">
-          <label class="text-sm text-gray-400 uppercase tracking-wider font-semibold">Placement Status</label>
-          <div class="flex items-center gap-2 p-2 rounded bg-gray-700/50 border border-gray-600">
-             <div class="p-1 rounded bg-green-500/20 text-green-400">
-                 <CheckSquare class="w-4 h-4" v-if="!store.selectedImage?.manualPosition" />
-                 <div class="w-4 h-4" v-else></div>
-             </div>
-             <div class="flex-1">
-                 <p class="text-sm font-medium text-gray-200" v-if="!store.selectedImage?.manualPosition">Auto (ZCA)</p>
-                 <p class="text-sm font-medium text-blue-300" v-else>Manual Override</p>
-                 <p class="text-xs text-gray-500" v-if="!store.selectedImage?.manualPosition">Using smart algorithm</p>
-                 <p class="text-xs text-gray-500" v-else>Specific position set</p>
-             </div>
+            <!-- Auto Detect Controls -->
+            <div class="flex gap-2">
+                <button 
+                    @click="store.selectedIndex >= 0 && store.detectWatermark(store.selectedIndex)"
+                    class="flex-1 bg-blue-600 hover:bg-blue-500 text-white py-2 rounded flex items-center justify-center gap-2 text-sm transition-colors"
+                    :disabled="store.selectedIndex < 0"
+                >
+                    <Sparkles class="w-4 h-4" /> Auto Detect
+                </button>
+                <button 
+                    @click="store.selectedIndex >= 0 && store.clearMask(store.selectedIndex)"
+                    class="bg-gray-700 hover:bg-gray-600 text-gray-300 px-3 rounded flex items-center justify-center transition-colors"
+                    title="Clear Mask"
+                    :disabled="store.selectedIndex < 0"
+                >
+                    <Trash2 class="w-4 h-4" />
+                </button>
+            </div>
+
+            <p class="text-xs text-gray-400">Paint over the watermark you want to remove. The AI will fill in the background.</p>
+
+            <div>
+                <div class="flex justify-between mb-1">
+                    <label class="text-xs text-gray-400">Brush Size</label>
+                    <span class="text-xs text-gray-300">{{ store.brushSettings.size }}px</span>
+                </div>
+                <input 
+                    type="range" 
+                    min="5" 
+                    max="100" 
+                    step="1" 
+                    v-model.number="store.brushSettings.size"
+                    class="w-full h-1 bg-gray-600 rounded-lg appearance-none cursor-pointer accent-red-500"
+                />
+            </div>
+            
+            <div class="p-3 bg-red-900/20 border border-red-900/50 rounded text-xs text-red-200">
+                AI Inpainting is not yet connected. Masking preview only.
+            </div>
           </div>
-          <p class="text-xs text-gray-500 mt-1 italic">
-              * Drag the watermark on the image to set a manual position for that specific image.
-          </p>
+
       </div>
   </div>
 </template>
diff --git a/src/stores/gallery.ts b/src/stores/gallery.ts
index 272d691..38313f3 100644
--- a/src/stores/gallery.ts
+++ b/src/stores/gallery.ts
@@ -2,6 +2,13 @@ import { defineStore } from "pinia";
 import { ref, computed } from "vue";
 import { invoke } from "@tauri-apps/api/core";
 
+export interface MaskStroke {
+    type: 'path' | 'rect';
+    points?: {x: number, y: number}[]; // Normalized
+    rect?: {x: number, y: number, w: number, h: number}; // Normalized
+    width?: number; // Normalized brush width for paths
+}
+
 export interface ImageItem {
   path: string;
   thumbnail: string; 
@@ -13,6 +20,7 @@ export interface ImageItem {
   scale?: number;
   opacity?: number;
   color?: string;
+  maskStrokes?: MaskStroke[];
 }
 
 export interface WatermarkSettings {
@@ -26,6 +34,10 @@ export interface WatermarkSettings {
 export const useGalleryStore = defineStore("gallery", () => {
   const images = ref<ImageItem[]>([]);
   const selectedIndex = ref<number>(-1);
+  
+  // 'add' = Add Watermark, 'remove' = Remove Watermark (Inpainting)
+  const editMode = ref<'add' | 'remove'>('add');
+  
   const watermarkSettings = ref<WatermarkSettings>({
       type: 'text',
       text: 'Watermark',
@@ -33,6 +45,11 @@ export const useGalleryStore = defineStore("gallery", () => {
       opacity: 1.0,
       scale: 0.03, 
   });
+  
+  const brushSettings = ref({
+      size: 20, // screen pixels
+      opacity: 0.5 // visual only
+  });
 
   const selectedImage = computed(() => {
     if (selectedIndex.value >= 0 && selectedIndex.value < images.value.length) {
@@ -63,6 +80,48 @@ export const useGalleryStore = defineStore("gallery", () => {
       }
   }
 
+  function addMaskStroke(index: number, stroke: MaskStroke) {
+      if (images.value[index]) {
+          if (!images.value[index].maskStrokes) {
+              images.value[index].maskStrokes = [];
+          }
+          images.value[index].maskStrokes!.push(stroke);
+      }
+  }
+
+  function clearMask(index: number) {
+      if (images.value[index]) {
+          images.value[index].maskStrokes = [];
+      }
+  }
+
+  async function detectWatermark(index: number) {
+      const img = images.value[index];
+      if (!img) return;
+      
+      try {
+          // @ts-ignore
+          const result = await invoke<{rects: {x: number, y: number, width: number, height: number}[]}>("detect_watermark", { path: img.path });
+          
+          if (result.rects && result.rects.length > 0) {
+             // Append to existing strokes? Or replace? 
+             // User said "first automatically detect... but allow manual paint". 
+             // Usually detection is a starting point. Let's append. 
+             // (If user wants to restart, they can Clear first).
+             if (!img.maskStrokes) img.maskStrokes = [];
+             
+             result.rects.forEach(r => {
+                 img.maskStrokes!.push({
+                     type: 'rect',
+                     rect: { x: r.x, y: r.y, w: r.width, h: r.height }
+                 });
+             });
+          }
+      } catch (e) {
+          console.error("Detection failed", e);
+      }
+  }
+
   // Applies the settings from the CURRENT image (or global if not overridden) to ALL images
   // Strategy: Update Global Settings to match current view, and clear individual overrides so everyone follows global.
   function applySettingsToAll() {
@@ -105,12 +164,17 @@ export const useGalleryStore = defineStore("gallery", () => {
     images,
     selectedIndex,
     selectedImage,
+    editMode,
     watermarkSettings,
+    brushSettings,
     setImages,
     selectImage,
     updateWatermarkSettings,
     setImageManualPosition,
     setImageSetting,
-    applySettingsToAll
+    applySettingsToAll,
+    addMaskStroke,
+    clearMask,
+    detectWatermark
   };
 });