diff --git a/twain/twain/huagaods.cpp b/twain/twain/huagaods.cpp
index c67b1a1..60b6b9e 100644
--- a/twain/twain/huagaods.cpp
+++ b/twain/twain/huagaods.cpp
@@ -2077,6 +2077,7 @@ void huagao_ds::init_support_caps(void)
 				initf = trans_range((float)init, (float)l, (float)u, -1000.0f, 1000.0f);
 		switch (msg) {
 		case Msg::Get:
+			sf = 333.333f;
 			data = Capability::createRange<CapType::IBrightness>(Fix32(-1000.0f), Fix32(1000.0f), Fix32(sf), Fix32(nf), Fix32(initf));
 			return success();
 		case Msg::GetCurrent:
@@ -2111,6 +2112,7 @@ void huagao_ds::init_support_caps(void)
 				initf = trans_range((float)init, (float)l, (float)u, -1000.0f, 1000.0f);
 		switch (msg) {
 		case Msg::Get:
+			sf = 333.333f;
 			data = Capability::createRange<CapType::IContrast>(Fix32(-1000.0f), Fix32(1000.0f), Fix32(sf), Fix32(nf), Fix32(initf));
 			return success();
 		case Msg::GetCurrent: