fix：修改问题

src/server/utils/setImage.js

@@ -483,6 +483,7 @@ async function checkImageOutsideGrid() {
     };
 
     // ===================== 【判断1】图片是否大于台版 =====================
+
     const isImageBiggerThanGrid =
       imgDisplayInfo.width > grid.width || imgDisplayInfo.height > grid.height;
 
@@ -523,12 +524,16 @@ async function checkImageOutsideGrid() {
     const alphaThreshold = 1;
     const imgNaturalWidth = imgMetadata.width;
     const imgNaturalHeight = imgMetadata.height;
-
+    const hasAlpha = imgMetadata.channels === 4;
     for (let y = 0; y < imgNaturalHeight; y++) {
       if (hasOutsideValidPixel) break;
       for (let x = 0; x < imgNaturalWidth; x++) {
-        const imgDisplayX = imgDisplayInfo.left + x * scaleX;
-        const imgDisplayY = imgDisplayInfo.top + y * scaleY;
+        const imgDisplayX = parseFloat(
+          (imgDisplayInfo.left + x * scaleX).toFixed(2),
+        );
+        const imgDisplayY = parseFloat(
+          (imgDisplayInfo.top + y * scaleY).toFixed(2),
+        );
 
         if (isNaN(imgDisplayX) || isNaN(imgDisplayY)) continue;
 
@@ -539,11 +544,22 @@ async function checkImageOutsideGrid() {
           imgDisplayY > grid.bottom;
 
         if (isOutside) {
-          const pixelIndex = (y * imgNaturalWidth + x) * 4;
-          const alpha = pixels[pixelIndex + 3];
-          if (alpha > alphaThreshold) {
+          const pixelIndex = (y * imgNaturalWidth + x) * imgMetadata.channels;
+
+          // 🔥 终极兼容逻辑
+          let isValidPixel = false;
+          if (hasAlpha) {
+            // PNG 有透明通道：判断透明度
+            const alpha = pixels[pixelIndex + 3];
+            isValidPixel = alpha > alphaThreshold;
+          } else {
+            // JPG / 无透明通道：只要超出，一律视为有实色像素（纯白/彩色都算）
+            isValidPixel = true;
+          }
+
+          if (isValidPixel) {
             hasOutsideValidPixel = true;
-            console.log(`找到超出网格的有效像素：(${x},${y})`);
+            console.log(`✅ 检测到超出有效像素（坐标${x},${y}）`);
             break;
           }
         }