diff --git a/hgdriver/hgdev/hg_ipc.cpp b/hgdriver/hgdev/hg_ipc.cpp
index f396cb4..f5122c2 100644
--- a/hgdriver/hgdev/hg_ipc.cpp
+++ b/hgdriver/hgdev/hg_ipc.cpp
@@ -173,7 +173,7 @@ void shared_memory::init(void)
 	first_ = !(GetLastError() == ERROR_ALREADY_EXISTS);
 	obj_ = (void*)h;
 #else
-	int obj = shmget(key_, bytes_, IPC_EXCL | IPC_CREAT | 0600);
+	int obj = shmget(key_, bytes_, IPC_EXCL | IPC_CREAT | 0666);
 	if (obj < 0)
 	{
 		unsigned int* v = (unsigned int*)&key_;
diff --git a/hgdriver/hgdev/scanner_manager.cpp b/hgdriver/hgdev/scanner_manager.cpp
index 102d801..36df927 100644
--- a/hgdriver/hgdev/scanner_manager.cpp
+++ b/hgdriver/hgdev/scanner_manager.cpp
@@ -864,6 +864,9 @@ scanner_err hg_scanner_mgr::hg_scanner_get_parameter(scanner_handle h, const cha
             else
                 return SCANNER_ERR_ACCESS_DENIED;
         }
+        else if (strcmp(SANE_STD_OPT_NAME_CUSTOM_GAMMA, name) == 0)
+            return (scanner_err)SCAN_PTR(h)->device_io_control(IO_CTRL_CODE_GET_CUSTOM_GAMMA, data, (unsigned int*)len);
+
         if (strcmp(SANE_STD_OPT_NAME_LOGIN, name) == 0 ||
             strcmp(SANE_STD_OPT_NAME_LOGOUT, name) == 0)
             return SCANNER_ERR_DEVICE_NOT_SUPPORT;
@@ -943,6 +946,8 @@ scanner_err hg_scanner_mgr::hg_scanner_set_parameter(scanner_handle h, const cha
 
             return SCANNER_ERR_ACCESS_DENIED;
         }
+        else if (strcmp(SANE_STD_OPT_NAME_CUSTOM_GAMMA, name) == 0)
+            return (scanner_err)SCAN_PTR(h)->device_io_control(IO_CTRL_CODE_SET_CUSTOM_GAMMA, data, (unsigned int*)len);
     }
 
     return (scanner_err)SCAN_PTR(h)->set_setting(name, data, len);
diff --git a/hgsane/sane_hg_mdw.cpp b/hgsane/sane_hg_mdw.cpp
index 043d89d..8f35bf0 100644
--- a/hgsane/sane_hg_mdw.cpp
+++ b/hgsane/sane_hg_mdw.cpp
@@ -394,6 +394,8 @@ namespace local_utility
 		FIX_ID_TO_NAME(DEVICE_IP_ADDR, 255);
 		FIX_ID_TO_NAME(DEVICE_MAC_ADDR, 255);
 
+		FIX_ID_TO_NAME(CUSTOM_GAMMA, sizeof(SANE_Gamma));
+
 		return "";
 	}
 
@@ -1357,17 +1359,21 @@ bool hg_sane_middleware::get_current_value(scanner_handle handle, const void* op
 
 		if(!name.empty())
 		{
-			char	buf[256] = { 0 };
-			long	len = sizeof(buf) - 1;
+			char	*buf = new char[l + 4];
+			long	len = l;
+			bool	ret = false;
+
 			memcpy(buf, value, l);
+			buf[l] = 0;
 			if (hg_scanner_get_parameter(handle, name.c_str(), buf, &len) == SCANNER_ERR_OK)
 			{
 				setv(buf, len, value);
 
-				return true;
+				ret = true;
 			}
+			delete[] buf;
 
-			return false;
+			return ret;
 		}
 	}
 
@@ -1732,7 +1738,11 @@ SANE_Status hg_sane_middleware::set_option(SANE_Handle h, const void* option, SA
 		else
 		{
 			SANE_Int	id = -1;
-			find_stored_descriptor(handle, option, &id);
+			SANE_Option_Descriptor* desc = find_stored_descriptor(handle, option);
+			if (desc &&
+				(desc->type == SANE_TYPE_BUTTON || desc->type == SANE_TYPE_GROUP))
+				return SANE_STATUS_UNSUPPORTED;
+
 			if (dev->std_opt && dev->std_opt->is_known_option(id))
 			{
 				dev->std_opt->get_value(h, id, value);
@@ -1744,7 +1754,24 @@ SANE_Status hg_sane_middleware::set_option(SANE_Handle h, const void* option, SA
 
 		return ret;
 	}
-	else
+	else if (action == SANE_ACTION_GET_DEFAULT_VALUE)
+	{
+		SANE_Option_Descriptor* desc = find_stored_descriptor(handle, option);
+		if (desc &&
+			(desc->type == SANE_TYPE_BUTTON || desc->type == SANE_TYPE_GROUP))
+			return SANE_STATUS_UNSUPPORTED;
+
+		int	len = 0;
+		void* val = get_default_value(handle, option, &len);
+		if (!val)
+			return SANE_STATUS_UNSUPPORTED;
+
+		memcpy(value, val, len);
+		local_utility::free_memory(val);
+
+		return SANE_STATUS_GOOD;
+	}
+	else if(action == SANE_ACTION_SET_AUTO || action == SANE_ACTION_SET_VALUE)
 	{
 		SANE_Int	id = -1;
 		SANE_Option_Descriptor* desc = find_stored_descriptor(handle, option, &id);
@@ -1891,6 +1918,8 @@ SANE_Status hg_sane_middleware::set_option(SANE_Handle h, const void* option, SA
 
 		return status;
 	}
+
+	return SANE_STATUS_INVAL;
 }
 bool hg_sane_middleware::get_cur_value(SANE_Handle handle, void* option, void* value, SANE_Value_Type* type)
 {