diff --git a/plugins/dagu-ocr/CHANGELOG.md b/plugins/dagu-ocr/CHANGELOG.md
index c80042730..a61fb84e2 100644
--- a/plugins/dagu-ocr/CHANGELOG.md
+++ b/plugins/dagu-ocr/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Changelog
 
+## 1.2.2 - 2026-11-11
+
+### 修复
+
+- 修复 Windows HDR 显示器下桌面捕获帧可能全白的问题：检测到整帧纯白时自动回退 ZTools 系统截图，再进入同一套标注界面，避免把过曝冻帧当成正常画面。
+
 ## 1.2.1 - 2026-10-30
 
 ### 修复
diff --git a/plugins/dagu-ocr/plugin.json b/plugins/dagu-ocr/plugin.json
index 994afda48..623e3b9b9 100644
--- a/plugins/dagu-ocr/plugin.json
+++ b/plugins/dagu-ocr/plugin.json
@@ -1,7 +1,7 @@
 {
   "name": "dagu-ocr",
   "title": "大古截图",
-  "version": "1.2.1",
+  "version": "1.2.2",
   "description": "截图、OCR 文字识别与图片翻译，从图片中提取并翻译文字",
   "author": "beierweiwei",
   "logo": "icon.png",
diff --git a/plugins/dagu-ocr/src/capture/desktop-capture.js b/plugins/dagu-ocr/src/capture/desktop-capture.js
index e1acde72b..9b7b335c5 100644
--- a/plugins/dagu-ocr/src/capture/desktop-capture.js
+++ b/plugins/dagu-ocr/src/capture/desktop-capture.js
@@ -84,6 +84,29 @@ export function pickSourceForDisplay(sources, display) {
   return list.find((source) => /^screen/i.test(String(source.id || ''))) || list[0];
 }
 
+async function isSolidWhiteFrame(dataUrl, win = globalThis.window) {
+  if (!dataUrl.startsWith('data:image/') || !win?.Image || !win?.document?.createElement) return false;
+  const image = new win.Image();
+  const loaded = new Promise((resolve, reject) => {
+    image.onload = resolve;
+    image.onerror = () => reject(new Error('截图帧解码失败'));
+  });
+  image.src = dataUrl;
+  await loaded;
+
+  const canvas = win.document.createElement('canvas');
+  canvas.width = 16;
+  canvas.height = 16;
+  const context = canvas.getContext('2d', { willReadFrequently: true });
+  if (!context) return false;
+  context.drawImage(image, 0, 0, canvas.width, canvas.height);
+  const pixels = context.getImageData(0, 0, canvas.width, canvas.height).data;
+  for (let index = 0; index < pixels.length; index += 4) {
+    if (pixels[index] !== 255 || pixels[index + 1] !== 255 || pixels[index + 2] !== 255) return false;
+  }
+  return true;
+}
+
 // 返回原始分辨率截图（image 像素与显示器物理像素一致）。
 export async function captureDisplay(win, display) {
   const host = hostApi(win);
@@ -96,6 +119,9 @@ export async function captureDisplay(win, display) {
   const thumbnail = source?.thumbnail;
   const dataUrl = typeof thumbnail?.toDataURL === 'function' ? thumbnail.toDataURL() : '';
   if (!dataUrl) throw new Error('未获取到屏幕截图');
+  if (await isSolidWhiteFrame(dataUrl, win)) {
+    throw new Error('HDR 环境截图输出全白，已回退系统截图');
+  }
   const size = typeof thumbnail?.getSize === 'function' ? thumbnail.getSize() : requested;
   return {
     dataUrl,