diff --git a/hgdriver/hgdev/hg_scanner.cpp b/hgdriver/hgdev/hg_scanner.cpp
index d017301..035a9f7 100644
--- a/hgdriver/hgdev/hg_scanner.cpp
+++ b/hgdriver/hgdev/hg_scanner.cpp
@@ -1856,7 +1856,8 @@ int hg_scanner::save_final_image(hg_imgproc::LPIMGHEAD head, void* buf)
 	std::string bw("");
 
 	final_img_index_++;
-	if (image_prc_param_.bits.color_mode == COLOR_MODE_BLACK_WHITE)
+	//if (image_prc_param_.bits.color_mode == COLOR_MODE_BLACK_WHITE)
+	if(img_conf_.pixtype == 0)
 	{
 		int old = head->line_bytes;
 		bw = bmp_821((unsigned char*)buf, head->width, head->height, &head->line_bytes, async_io_);