diff --git a/hgdriver/hgdev/image_process.cpp b/hgdriver/hgdev/image_process.cpp
index e3b116a..147bcf3 100644
--- a/hgdriver/hgdev/image_process.cpp
+++ b/hgdriver/hgdev/image_process.cpp
@@ -523,7 +523,7 @@ namespace hg_imgproc
 
 						float vratio = 0.0;
 						float hratio = 0.0;
-						//cv::imwrite("C:\\image\\imdecode" + std::to_string(img_idx++) + ".jpg", mat);
+						cv::imwrite("C:\\image\\imdecode" + std::to_string(img_idx++) + ".jpg", mat);
 						int dpi = param_.dpi == 600 ? 3 : (param_.dpi < 599 && param_.dpi >= 300) ? 2 : 1;
 						int mode = param_.color_mode == COLOR_MODE_24_BITS ? 1 : 0;
 						for (auto it  : correction_image_map_)
@@ -1767,8 +1767,8 @@ namespace hg_imgproc
 		}
 
 
-#define GAMMA_EX  1.7f
-#define BLACK_OFFSET 0
+#define GAMMA_EX  2.0f
+#define BLACK_OFFSET 8
 
 		void fittingLUT(const std::vector<unsigned char>& points, unsigned char min_value, unsigned char max_value, unsigned char* data)
 		{
@@ -1784,7 +1784,7 @@ namespace hg_imgproc
 			float temp;
 			for (int j = 0, length = (255 - b + 1); j < length; j++)
 			{
-				temp = tb + step * j;// gamma(tb + step * j, GAMMA_EX) - BLACK_OFFSET;
+				temp =  gamma(tb + step * j, GAMMA_EX) - BLACK_OFFSET;//tb + step * j;//
 				data[j + b] = (cv::min)(255, (cv::max)(0, static_cast<int>(temp)));
 			}
 		}