diff --git a/XP.ImageProcessing.RoiControl/Controls/PolygonRoiCanvas.xaml.cs b/XP.ImageProcessing.RoiControl/Controls/PolygonRoiCanvas.xaml.cs
index 1ddedc0..e046738 100644
--- a/XP.ImageProcessing.RoiControl/Controls/PolygonRoiCanvas.xaml.cs
+++ b/XP.ImageProcessing.RoiControl/Controls/PolygonRoiCanvas.xaml.cs
@@ -444,8 +444,9 @@ namespace XP.ImageProcessing.RoiControl.Controls
             double w = CanvasWidth, h = CanvasHeight;
             if (w <= 0 || h <= 0) return;
 
-            _crosshairH = new Line { X1 = 0, Y1 = h / 2, X2 = w, Y2 = h / 2, Stroke = Brushes.Red, StrokeThickness = 1, Opacity = 0.7, IsHitTestVisible = false };
-            _crosshairV = new Line { X1 = w / 2, Y1 = 0, X2 = w / 2, Y2 = h, Stroke = Brushes.Red, StrokeThickness = 1, Opacity = 0.7, IsHitTestVisible = false };
+            double thickness = Math.Max(1, Math.Round(Math.Max(w, h) / 1000.0));
+            _crosshairH = new Line { X1 = 0, Y1 = h / 2, X2 = w, Y2 = h / 2, Stroke = Brushes.Red, StrokeThickness = thickness, Opacity = 0.7, IsHitTestVisible = false };
+            _crosshairV = new Line { X1 = w / 2, Y1 = 0, X2 = w / 2, Y2 = h, Stroke = Brushes.Red, StrokeThickness = thickness, Opacity = 0.7, IsHitTestVisible = false };
             mainCanvas.Children.Add(_crosshairH);
             mainCanvas.Children.Add(_crosshairV);
         }
diff --git a/XplorePlane/Assets/Icons/QFN.png b/XplorePlane/Assets/Icons/QFN.png
new file mode 100644
index 0000000..b2dd0e3
Binary files /dev/null and b/XplorePlane/Assets/Icons/QFN.png differ
diff --git a/XplorePlane/Views/Main/ViewportPanelView.xaml.cs b/XplorePlane/Views/Main/ViewportPanelView.xaml.cs
index f0957da..80fb852 100644
--- a/XplorePlane/Views/Main/ViewportPanelView.xaml.cs
+++ b/XplorePlane/Views/Main/ViewportPanelView.xaml.cs
@@ -187,6 +187,14 @@ namespace XplorePlane.Views
                     ToggleLineProfile();
                 }, Prism.Events.ThreadOption.UIThread);
 
+                // 图像变化时重绘线灰度
+                var canvasWidthDesc = System.ComponentModel.DependencyPropertyDescriptor.FromProperty(
+                    PolygonRoiCanvas.CanvasWidthProperty, typeof(PolygonRoiCanvas));
+                canvasWidthDesc?.AddValueChanged(RoiCanvas, (s, e) =>
+                {
+                    if (_lineProfileEnabled) RedrawLineProfile();
+                });
+
                 // 白底检测：进入ROI绘制模式
                 ea2?.GetEvent<WhiteBackgroundDetectionEvent>().Subscribe(() =>
                 {
@@ -256,8 +264,12 @@ namespace XplorePlane.Views
                 // 参考线默认在图像中间
                 _profileLineY = RoiCanvas.CanvasHeight / 2;
 
+                // 根据图像分辨率自适应线条粗细
+                double maxDim = Math.Max(RoiCanvas.CanvasWidth, RoiCanvas.CanvasHeight);
+                double lineThickness = Math.Max(1, Math.Round(maxDim / 1000.0));
+
                 // 创建参考线（红色水平线，可拖动）
-                // 用透明粗线作为命中区域，叠加1px红线显示
+                // 用透明粗线作为命中区域，叠加红线显示
                 _profileRefLine = new System.Windows.Shapes.Line
                 {
                     X1 = 0,
@@ -265,7 +277,7 @@ namespace XplorePlane.Views
                     X2 = RoiCanvas.CanvasWidth,
                     Y2 = _profileLineY,
                     Stroke = System.Windows.Media.Brushes.Transparent,
-                    StrokeThickness = 7,  // 上下3px命中区域
+                    StrokeThickness = lineThickness + 6,  // 上下命中区域
                     IsHitTestVisible = true,
                     Cursor = System.Windows.Input.Cursors.SizeNS
                 };
@@ -276,7 +288,7 @@ namespace XplorePlane.Views
                     X2 = RoiCanvas.CanvasWidth,
                     Y2 = _profileLineY,
                     Stroke = System.Windows.Media.Brushes.Red,
-                    StrokeThickness = 1,
+                    StrokeThickness = lineThickness,
                     IsHitTestVisible = false
                 };
                 _profileRefLine.MouseLeftButtonDown += ProfileLine_MouseDown;
@@ -289,7 +301,7 @@ namespace XplorePlane.Views
                 _profileCurve = new System.Windows.Shapes.Polyline
                 {
                     Stroke = System.Windows.Media.Brushes.Red,
-                    StrokeThickness = 1,
+                    StrokeThickness = lineThickness,
                     IsHitTestVisible = false
                 };
                 canvas.Children.Add(_profileCurve);
@@ -393,6 +405,64 @@ namespace XplorePlane.Views
             SetStatus($"行灰度分布 | Y={row} | 均值={rowPixels.Select(b => (double)b).Average():F1} | 最大={rowPixels.Max()} | 最小={rowPixels.Min()}");
         }
 
+        /// <summary>
+        /// 图像变化时重绘线灰度（移除旧元素，重新创建）
+        /// </summary>
+        private void RedrawLineProfile()
+        {
+            var canvas = FindChildByName<System.Windows.Controls.Canvas>(RoiCanvas, "mainCanvas");
+            if (canvas == null) return;
+
+            // 移除旧元素
+            if (_profileRefLine != null) { canvas.Children.Remove(_profileRefLine); _profileRefLine = null; }
+            if (_profileRefLineVisible != null) { canvas.Children.Remove(_profileRefLineVisible); _profileRefLineVisible = null; }
+            if (_profileCurve != null) { canvas.Children.Remove(_profileCurve); _profileCurve = null; }
+
+            // 重新计算参考线位置（保持相对比例或重置到中间）
+            _profileLineY = RoiCanvas.CanvasHeight / 2;
+
+            // 根据新图像分辨率自适应线条粗细
+            double maxDim = Math.Max(RoiCanvas.CanvasWidth, RoiCanvas.CanvasHeight);
+            double lineThickness = Math.Max(1, Math.Round(maxDim / 1000.0));
+
+            _profileRefLine = new System.Windows.Shapes.Line
+            {
+                X1 = 0,
+                Y1 = _profileLineY,
+                X2 = RoiCanvas.CanvasWidth,
+                Y2 = _profileLineY,
+                Stroke = System.Windows.Media.Brushes.Transparent,
+                StrokeThickness = lineThickness + 6,
+                IsHitTestVisible = true,
+                Cursor = System.Windows.Input.Cursors.SizeNS
+            };
+            _profileRefLineVisible = new System.Windows.Shapes.Line
+            {
+                X1 = 0,
+                Y1 = _profileLineY,
+                X2 = RoiCanvas.CanvasWidth,
+                Y2 = _profileLineY,
+                Stroke = System.Windows.Media.Brushes.Red,
+                StrokeThickness = lineThickness,
+                IsHitTestVisible = false
+            };
+            _profileRefLine.MouseLeftButtonDown += ProfileLine_MouseDown;
+            _profileRefLine.MouseMove += ProfileLine_MouseMove;
+            _profileRefLine.MouseLeftButtonUp += ProfileLine_MouseUp;
+            canvas.Children.Add(_profileRefLineVisible);
+            canvas.Children.Add(_profileRefLine);
+
+            _profileCurve = new System.Windows.Shapes.Polyline
+            {
+                Stroke = System.Windows.Media.Brushes.Red,
+                StrokeThickness = lineThickness,
+                IsHitTestVisible = false
+            };
+            canvas.Children.Add(_profileCurve);
+
+            UpdateLineProfile();
+        }
+
         #endregion
 
         private void OnDataContextChanged(object sender, DependencyPropertyChangedEventArgs e)