新增高亮颜色功能，更新相关组件以支持颜色高亮效果，优化像素化画布绘制逻辑，提升用户体验和代码可读性。

src/app/page.tsx

@@ -141,6 +141,9 @@ export default function Home() {
     includeStats: true // 默认包含统计信息
   });
 
+  // 新增：高亮相关状态
+  const [highlightColorKey, setHighlightColorKey] = useState<string | null>(null);
+
   const originalCanvasRef = useRef<HTMLCanvasElement>(null);
   const pixelatedCanvasRef = useRef<HTMLCanvasElement>(null);
   const fileInputRef = useRef<HTMLInputElement>(null);
@@ -1182,6 +1185,15 @@ export default function Home() {
     importPaletteInputRef.current?.click();
   };
 
+  // 新增：处理颜色高亮
+  const handleHighlightColor = (colorHex: string) => {
+    setHighlightColorKey(colorHex);
+  };
+
+  // 新增：高亮完成回调
+  const handleHighlightComplete = () => {
+    setHighlightColorKey(null);
+  };
 
   return (
     <>
@@ -1540,6 +1552,7 @@ export default function Home() {
                       selectedColorSystem={selectedColorSystem}
                       isEraseMode={isEraseMode}
                       onEraseToggle={handleEraseToggle}
+                      onHighlightColor={handleHighlightColor}
                     />
                   </div>
                 </div>
@@ -1558,6 +1571,8 @@ export default function Home() {
                     gridDimensions={gridDimensions}
                     isManualColoringMode={isManualColoringMode}
                     onInteraction={handleCanvasInteraction}
+                    highlightColorKey={highlightColorKey}
+                    onHighlightComplete={handleHighlightComplete}
                   />
                 </div>
               </div>

src/components/ColorPalette.tsx

@@ -19,6 +19,8 @@ interface ColorPaletteProps {
   // 新增：一键擦除相关props
   isEraseMode?: boolean;
   onEraseToggle?: () => void;
+  // 新增：高亮相关props
+  onHighlightColor?: (colorHex: string) => void; // 触发高亮某个颜色
 }
 
 const ColorPalette: React.FC<ColorPaletteProps> = ({ 
@@ -28,7 +30,8 @@ const ColorPalette: React.FC<ColorPaletteProps> = ({
   transparentKey,
   selectedColorSystem,
   isEraseMode,
-  onEraseToggle
+  onEraseToggle,
+  onHighlightColor
 }) => {
   if (!colors || colors.length === 0) {
     // Apply dark mode text color
@@ -71,7 +74,13 @@ const ColorPalette: React.FC<ColorPaletteProps> = ({
         return (
           <button
             key={colorData.key}
-            onClick={() => onColorSelect(colorData)}
+            onClick={() => {
+              onColorSelect(colorData);
+              // 如果不是透明颜色且有高亮回调，触发高亮效果
+              if (!isTransparent && onHighlightColor) {
+                onHighlightColor(colorData.color);
+              }
+            }}
             className={`w-8 h-8 rounded border-2 flex-shrink-0 transition-transform transform hover:scale-110 focus:outline-none focus:ring-2 focus:ring-offset-1 focus:ring-blue-400 dark:focus:ring-blue-500 ${ 
               isSelected
                 // Apply dark mode styles for selected state

src/components/PixelatedPreviewCanvas.tsx

@@ -16,28 +16,30 @@ interface PixelatedPreviewCanvasProps {
     isClick: boolean,
     isTouchEnd?: boolean
   ) => void;
+  highlightColorKey?: string | null;
+  onHighlightComplete?: () => void;
 }
 
 // 绘制像素化画布的函数
 const drawPixelatedCanvas = (
   dataToDraw: MappedPixel[][],
   canvas: HTMLCanvasElement | null,
-  dims: { N: number; M: number } | null
+  dims: { N: number; M: number } | null,
+  highlightColorKey?: string | null,
+  isHighlighting?: boolean
 ) => {
-  if (!canvas || !dims || dims.N <= 0 || dims.M <= 0) {
-    console.warn("无法绘制Canvas：参数无效或数据未准备好");
-    const ctx = canvas?.getContext('2d');
-    if (ctx && canvas) ctx.clearRect(0, 0, canvas.width, canvas.height);
-    return;
-  }
-  
-  const pixelatedCtx = canvas.getContext('2d');
-  if (!pixelatedCtx) {
-    console.error("无法获取Canvas绘图上下文");
+  if (!canvas || !dims || !dataToDraw) {
+    console.warn("drawPixelatedCanvas: Missing required parameters");
     return;
   }
 
-  // Check if dark mode is active on the HTML element
+  const pixelatedCtx = canvas.getContext('2d');
+  if (!pixelatedCtx) {
+    console.error("Failed to get 2D context for pixelated canvas");
+    return;
+  }
+
+  // Respect current dark mode preference
   const isDarkMode = typeof window !== 'undefined' && document.documentElement.classList.contains('dark');
 
   // Define colors based on mode
@@ -69,6 +71,15 @@ const drawPixelatedCanvas = (
       }
       pixelatedCtx.fillRect(drawX, drawY, cellWidthOutput, cellHeightOutput);
 
+      // 如果正在高亮且当前单元格不是目标颜色，添加半透明黑色蒙版
+      if (isHighlighting && highlightColorKey && !cellData.isExternal) {
+        const shouldDim = cellData.color.toUpperCase() !== highlightColorKey.toUpperCase();
+        if (shouldDim) {
+          pixelatedCtx.fillStyle = 'rgba(0, 0, 0, 0.6)'; // 60% 透明度的黑色蒙版
+          pixelatedCtx.fillRect(drawX, drawY, cellWidthOutput, cellHeightOutput);
+        }
+      }
+
       // Draw grid lines using mode-specific color
       pixelatedCtx.strokeStyle = gridLineColor;
       pixelatedCtx.strokeRect(drawX + 0.5, drawY + 0.5, cellWidthOutput, cellHeightOutput);
@@ -82,10 +93,13 @@ const PixelatedPreviewCanvas: React.FC<PixelatedPreviewCanvasProps> = ({
   isManualColoringMode,
   canvasRef,
   onInteraction,
+  highlightColorKey,
+  onHighlightComplete,
 }) => {
   const [darkModeState, setDarkModeState] = useState<boolean | null>(null);
   const touchStartPosRef = useRef<{ x: number; y: number; pageX: number; pageY: number } | null>(null);
   const touchMovedRef = useRef<boolean>(false);
+  const [isHighlighting, setIsHighlighting] = useState(false);
 
   // Effect to detect dark mode changes and update state
   useEffect(() => {
@@ -116,9 +130,23 @@ const PixelatedPreviewCanvas: React.FC<PixelatedPreviewCanvasProps> = ({
     // Ensure darkModeState is not null before drawing
     if (mappedPixelData && gridDimensions && canvasRef.current && darkModeState !== null) {
       console.log(`Redrawing canvas, dark mode: ${darkModeState}`); // Log redraw trigger
-      drawPixelatedCanvas(mappedPixelData, canvasRef.current, gridDimensions);
+      drawPixelatedCanvas(mappedPixelData, canvasRef.current, gridDimensions, highlightColorKey, isHighlighting);
     }
-  }, [mappedPixelData, gridDimensions, canvasRef, darkModeState]); // Add darkModeState dependency
+  }, [mappedPixelData, gridDimensions, canvasRef, darkModeState, highlightColorKey, isHighlighting]); // Add darkModeState dependency
+
+  // 处理高亮效果
+  useEffect(() => {
+    if (highlightColorKey && mappedPixelData && gridDimensions) {
+      setIsHighlighting(true);
+      // 0.3秒后结束高亮
+      const timer = setTimeout(() => {
+        setIsHighlighting(false);
+        onHighlightComplete?.();
+      }, 300);
+
+      return () => clearTimeout(timer);
+    }
+  }, [highlightColorKey, mappedPixelData, gridDimensions, onHighlightComplete]);
 
   // --- 鼠标事件处理 ---
   

src/utils/imageDownloader.ts

@@ -226,7 +226,7 @@ export async function downloadImage({
     ctx.textBaseline = 'middle';
     
     // 添加文字阴影效果
-    ctx.shadowColor = 'rgba(0, 0, 0, 0.3)';
+    ctx.shadowColor = 'rgba(0, 0, 0, 0.5)';
     ctx.shadowBlur = 5;
     ctx.shadowOffsetX = 2;
     ctx.shadowOffsetY = 2;