diff --git a/hgdriver/ImageProcess/ImageApplyFadeBackGroundColor.cpp b/hgdriver/ImageProcess/ImageApplyFadeBackGroundColor.cpp
index 70c6b4a..91e9c36 100644
--- a/hgdriver/ImageProcess/ImageApplyFadeBackGroundColor.cpp
+++ b/hgdriver/ImageProcess/ImageApplyFadeBackGroundColor.cpp
@@ -112,7 +112,7 @@ void CImageApplyFadeBackGroudColor::fadeBackground(unsigned char* data, int widt
 
     unsigned char offset_rgb[3];
     for (uint i = 0; i < 3; i++)
-        offset_rgb[i] = 255 + offset - max_indexes[i];
+        offset_rgb[i] = cv::min(255 + offset - max_indexes[i], 255);
 
 #if 1
     ptr_data = data;
diff --git a/hgdriver/ImageProcess/ImageApplyFadeBackGroundColor.h b/hgdriver/ImageProcess/ImageApplyFadeBackGroundColor.h
index f06964e..ad749c5 100644
--- a/hgdriver/ImageProcess/ImageApplyFadeBackGroundColor.h
+++ b/hgdriver/ImageProcess/ImageApplyFadeBackGroundColor.h
@@ -14,7 +14,8 @@
  *				 2021/10/29  v3.3 优化算法，增加range参数。针对复杂内容的图像，能够有效甄别背景和非背景内容。
  *				 2022/03/08  v3.4 修复变量未初始化的BUG。
  *				 2022/10/22  v3.5 使opencv ROI的内存机制。
- * 版本号：v3.5
+ *				 2023/11/22  v3.6 修复数值越界BUG。
+ * 版本号：v3.6
 
  * ====================================================
  */
diff --git a/hgdriver/hgdev/image_process.cpp b/hgdriver/hgdev/image_process.cpp
index ed337fd..c1560a8 100644
--- a/hgdriver/hgdev/image_process.cpp
+++ b/hgdriver/hgdev/image_process.cpp
@@ -727,7 +727,7 @@ namespace hg_imgproc
 
 			mats_.clear();
 
-			CImageApplyFadeBackGroudColor fade(40, 100, img_conf_.fadebackrange);
+			CImageApplyFadeBackGroudColor fade(20, 100, img_conf_.fadebackrange);
 			for(size_t i = 0; i < mats.size();i++)
 			{
 				fade.apply(mats[i],img_conf_.is_duplex);