diff --git a/thumbnailer/loadxisf.cpp b/thumbnailer/loadxisf.cpp
index e79e73c..059b496 100644
--- a/thumbnailer/loadxisf.cpp
+++ b/thumbnailer/loadxisf.cpp
@@ -8,7 +8,16 @@ bool OpenGLES = false;
 void RawImageToHTBITMAP(std::shared_ptr<RawImage> &rawImage, HBITMAP *hbmp, UINT thumbSize)
 {
     rawImage->calcStats();
-    if(rawImage->imageStats().m_median[0] < rawImage->norm() * 0.2f)
+
+    DWORD thre = 20;
+    DWORD dataSize = 4;
+    HRESULT hr = HRESULT_FROM_WIN32(RegGetValueW(HKEY_CURRENT_USER, L"SOFTWARE\\nou\\Tenmon\\settings", L"thumbnailstretchthreshold", RRF_RT_DWORD, NULL, &thre, &dataSize));
+
+    float thref = 0.2f;
+    if(hr == S_OK)
+        thref = thre / 100.0f;
+
+    if(rawImage->imageStats().m_median[0] < rawImage->norm() * thref)
     {
         //OutputDebugStringA("Stretch image");
         MTFParam params = rawImage->calcMTFParams();