diff --git a/js/script.js b/js/script.js
index 2f284e6..b03d5ff 100644
--- a/js/script.js
+++ b/js/script.js
@@ -1952,39 +1952,38 @@
         }
     }
 
-    // 生成画布（所见即所得 - 使用显示尺寸）
+    // 生成画布（固定分辨率 1080×1920 高清无损）
     async function generateCanvas() {
         const canvas = exportCanvas;
         const ctx = canvas.getContext('2d');
         const container = imageContainer;
 
-        // 高清渲染倍数
-        const scaleFactor = 2;
+        // 固定高清分辨率 1080×1920
+        const TARGET_WIDTH = 1080;
+        const TARGET_HEIGHT = 1920;
         
-        // 显示尺寸
+        // 显示尺寸（用于计算缩放比例）
         const displayWidth = container.clientWidth;
         const displayHeight = container.clientHeight;
         
-        // 高清画布尺寸（2倍）
-        const width = displayWidth * scaleFactor;
-        const height = displayHeight * scaleFactor;
+        // 设置画布为固定高清分辨率
+        canvas.width = TARGET_WIDTH;
+        canvas.height = TARGET_HEIGHT;
 
-        canvas.width = width;
-        canvas.height = height;
-
-        // 启用高清渲染
+        // 启用最高质量渲染
         ctx.imageSmoothingEnabled = true;
         ctx.imageSmoothingQuality = 'high';
 
+        // 白色背景
         ctx.fillStyle = '#fff';
-        ctx.fillRect(0, 0, width, height);
+        ctx.fillRect(0, 0, TARGET_WIDTH, TARGET_HEIGHT);
 
-        // 计算缩放比例
-        const scaleX = width / displayWidth;
-        const scaleY = height / displayHeight;
+        // 计算从显示尺寸到目标分辨率的缩放比例
+        const scaleX = TARGET_WIDTH / displayWidth;
+        const scaleY = TARGET_HEIGHT / displayHeight;
 
         if (currentImage) {
-            drawBgImageOnCanvasHD(ctx, currentImage, width, height, scaleX, scaleY);
+            drawBgImageOnCanvasHD(ctx, currentImage, TARGET_WIDTH, TARGET_HEIGHT, scaleX, scaleY);
         }
 
         await drawOverlayImagesHD(ctx, scaleX, scaleY);