diff --git a/modules/base/HGImage.cpp b/modules/base/HGImage.cpp
index dd9686fd..413725ee 100644
--- a/modules/base/HGImage.cpp
+++ b/modules/base/HGImage.cpp
@@ -26,8 +26,8 @@ struct HGImageImpl
 		m_top = 0;
 		m_right = 0;
 		m_bottom = 0;
-		m_xDpi = 96;
-		m_yDpi = 96;
+		m_xDpi = 0;
+		m_yDpi = 0;
 	}
 
 	~HGImageImpl()
@@ -174,7 +174,7 @@ HGResult HGAPI HGBase_CreateImage(HGUInt width, HGUInt height, HGUInt type, HGUI
 	}
 	else
 	{
-		hBmp = CreateHBITMAP(width, height, type, origin, 96, 96, &data);
+		hBmp = CreateHBITMAP(width, height, type, origin, 0, 0, &data);
 		if (NULL == hBmp)
 			return HGBASE_ERR_OUTOFMEMORY;
 		else
@@ -206,8 +206,8 @@ HGResult HGAPI HGBase_CreateImage(HGUInt width, HGUInt height, HGUInt type, HGUI
 	imageImpl->m_top = 0;
 	imageImpl->m_right = imageImpl->m_width;
 	imageImpl->m_bottom = imageImpl->m_height;
-	imageImpl->m_xDpi = 96;
-	imageImpl->m_yDpi = 96;
+	imageImpl->m_xDpi = 0;
+	imageImpl->m_yDpi = 0;
 
 	*image = (HGImage)imageImpl;
 	return HGBASE_ERR_OK;
@@ -265,8 +265,8 @@ HGResult HGAPI HGBase_CreateImageWithData(HGByte* data, const HGImageInfo* info,
 	imageImpl->m_top = 0;
 	imageImpl->m_right = imageImpl->m_width;
 	imageImpl->m_bottom = imageImpl->m_height;
-	imageImpl->m_xDpi = 96;
-	imageImpl->m_yDpi = 96;
+	imageImpl->m_xDpi = 0;
+	imageImpl->m_yDpi = 0;
 
 	*image = (HGImage)imageImpl;
 	return HGBASE_ERR_OK;
diff --git a/modules/base/HGImage.h b/modules/base/HGImage.h
index cd87fdf0..50e6babe 100644
--- a/modules/base/HGImage.h
+++ b/modules/base/HGImage.h
@@ -63,7 +63,7 @@ typedef struct
 *	 否则内部分配普通内存(无HBITMAP); 在linux系统上，新图像内部分配普通内存(无HBITMAP)
 * 2) 新图像的width=width; 新图像的height=height; 新图像的type=type; 新图像的widthStep为4字节对齐; 新图像的origin=origin
 * 3) 新图像的roi为{0, 0, width, height}
-* 4) 新图像的xdpi=96, ydpi=96
+* 4) 新图像的xdpi=0, ydpi=0
 */
 HGEXPORT HGResult HGAPI HGBase_CreateImage(HGUInt width, HGUInt height, HGUInt type, HGUInt origin, HGImage* image);
 
@@ -77,7 +77,7 @@ HGEXPORT HGResult HGAPI HGBase_CreateImage(HGUInt width, HGUInt height, HGUInt t
 * 2) 新图像的width=info->width; 新图像的height=info->height; 新图像的type=info->type; 新图像的widthStep=info->widthStep;
 *	 新图像的origin=info->origin
 * 3) 新图像的roi为{0, 0, width, height}
-* 4) 新图像的xdpi=96, ydpi=96
+* 4) 新图像的xdpi=0, ydpi=0
 */
 HGEXPORT HGResult HGAPI HGBase_CreateImageWithData(HGByte* data, const HGImageInfo* info, HGImage* image);
 
@@ -95,7 +95,7 @@ HGEXPORT HGResult HGAPI HGBase_CreateImageWithData(HGByte* data, const HGImageIn
 * 2) 新图像的width=roi->right-roi->left; 新图像的height=roi->bottom-roi->top; 新图像的type=type; 新图像的widthStep为4字节对齐; 
 *	 新图像的origin=origin, 如果origin和info->origin不一致，拷贝时像素会进行上下翻转
 * 3) 新图像的roi为{0, 0, width, height}
-* 4) 新图像的xdpi=96, ydpi=96
+* 4) 新图像的xdpi=0, ydpi=0
 */
 HGEXPORT HGResult HGAPI HGBase_CreateImageFromData(HGByte* data, const HGImageInfo *info, const HGImageRoi *roi, 
 	HGUInt type, HGUInt origin, HGImage* image);
diff --git a/modules/imgfmt/HGImgFmt.cpp b/modules/imgfmt/HGImgFmt.cpp
index c2b4fcd9..93b43b39 100644
--- a/modules/imgfmt/HGImgFmt.cpp
+++ b/modules/imgfmt/HGImgFmt.cpp
@@ -618,7 +618,7 @@ HGResult HGAPI HGImgFmt_SaveImage(HGImage image, HGUInt fmtType, const HGImgFmtS
 		}
 	}
 
-	HGUInt xDpi = 96, yDpi = 96;
+	HGUInt xDpi = 0, yDpi = 0;
 	HGBase_GetImageDpi(image, &xDpi, &yDpi);
 
 	if (HGIMGFMT_TYPE_JPEG == fmtType)
@@ -1333,7 +1333,7 @@ HGResult HGAPI HGImgFmt_SaveImageToWriter(HGImgFmtWriter writer, HGImage image,
 		return HGBASE_ERR_INVALIDARG;
 	}
 
-	HGUInt xDpi = 96, yDpi = 96;
+	HGUInt xDpi = 0, yDpi = 0;
 	HGBase_GetImageDpi(image, &xDpi, &yDpi);
 
 	HGImgFmtWriterImpl* imgFmtWriterImpl = (HGImgFmtWriterImpl*)writer;
diff --git a/sdk/scannerlib/HGLibDeviceImpl.cpp b/sdk/scannerlib/HGLibDeviceImpl.cpp
index f163ba1f..e3a24a9c 100644
--- a/sdk/scannerlib/HGLibDeviceImpl.cpp
+++ b/sdk/scannerlib/HGLibDeviceImpl.cpp
@@ -220,7 +220,7 @@ HGLibDeviceImpl::HGLibDeviceImpl()
 	HGBase_CreateLock(&m_lock);
 	m_devHandle = NULL;
 	m_devName.clear();
-	m_dpi = 96;
+	m_dpi = 0;
 	m_scanning = HGFALSE;
 	m_scanEvent = NULL;
 	m_eventFunc = NULL;
@@ -1011,7 +1011,7 @@ HGBool HGLibDeviceImpl::StartScan(HGLibDeviceScanEventFunc eventFunc, HGPointer
 			m_imageParam = NULL;
 			HGBase_DestroyEvent(m_scanEvent);
 			m_scanEvent = NULL;
-			m_dpi = 96;
+			m_dpi = 0;
 		}
 		else
 		{
@@ -1039,7 +1039,7 @@ HGBool HGLibDeviceImpl::StopScan()
 		m_imageFunc = NULL;
 		m_imageParam = NULL;
 		m_scanning = HGFALSE;
-		m_dpi = 96;
+		m_dpi = 0;
 		ret = HGTRUE;
 	}
 	HGBase_LeaveLock(m_lock);
@@ -1197,7 +1197,7 @@ int HGLibDeviceImpl::sane_ex_callback(SANE_Handle hdev, int code, void* data, un
 		deviceImpl->m_imageFunc = NULL;
 		deviceImpl->m_imageParam = NULL;
 		deviceImpl->m_scanning = HGFALSE;
-		deviceImpl->m_dpi = 96;
+		deviceImpl->m_dpi = 0;
 		HGBase_LeaveLock(deviceImpl->m_lock);
 
 		if (NULL != eventFunc)
diff --git a/sdk/webscan/WebUser.cpp b/sdk/webscan/WebUser.cpp
index ba8b38ec..12f57bf9 100644
--- a/sdk/webscan/WebUser.cpp
+++ b/sdk/webscan/WebUser.cpp
@@ -212,7 +212,7 @@ WebUser::WebUser(WebServer* server, HGUInt id, HGMsgPump msgPump, const std::str
 	m_devNameList.clear();
 	m_devName.clear();
 	m_devHandle = NULL;
-	m_dpi = 96;
+	m_dpi = 0;
 	m_scanEvent = NULL;
 
 	SANE_Int version_code = 0;
@@ -233,7 +233,7 @@ WebUser::~WebUser()
 
 	if (NULL != m_devHandle)
 	{
-		m_dpi = 96;
+		m_dpi = 0;
 		sane_close(m_devHandle);
 		m_devHandle = NULL;
 		m_devName.clear();
@@ -285,7 +285,7 @@ void WebUser::CloseDev(const CloseDevParam* param)
 
 		if (NULL != m_devHandle)
 		{
-			m_dpi = 96;
+			m_dpi = 0;
 			sane_close(m_devHandle);
 			m_devHandle = NULL;
 			m_devName.clear();
@@ -424,7 +424,7 @@ void WebUser::SelectDevice(cJSON* json)
 
 			if (NULL != m_devHandle)
 			{
-				m_dpi = 96;
+				m_dpi = 0;
 				sane_close(m_devHandle);
 				m_devHandle = NULL;
 				m_devName.clear();
@@ -1287,7 +1287,7 @@ HGBool WebUser::SetParam(const char* optionName, const HGVoid* data)
 HGInt WebUser::GetDpi()
 {
 	assert(NULL != m_devHandle);
-	HGInt dpi = 96;
+	HGInt dpi = 0;
 
 	SANE_Int num_dev_options = 0;
 	sane_control_option(m_devHandle, 0, SANE_ACTION_GET_VALUE, &num_dev_options, NULL);
@@ -1305,7 +1305,7 @@ HGInt WebUser::GetDpi()
 		{
 			if (SANE_TYPE_INT == desp->type)
 			{
-				SANE_Int value = 96;
+				SANE_Int value = 0;
 				sane_control_option(m_devHandle, i, SANE_ACTION_GET_VALUE, &value, NULL);
 				dpi = value;	
 			}