diff --git a/DirectXTex/DirectXTexImage.cpp b/DirectXTex/DirectXTexImage.cpp
index d57d039..8067fbd 100644
--- a/DirectXTex/DirectXTexImage.cpp
+++ b/DirectXTex/DirectXTexImage.cpp
@@ -764,7 +764,7 @@ bool ScratchImage::IsAlphaAllOpaque() const
         if (!scanline)
             return false;
 
-        static const XMVECTORF32 threshold = { { { 0.99f, 0.99f, 0.99f, 0.99f } } };
+        static const XMVECTORF32 threshold = { { { 0.997f, 0.997f, 0.997f, 0.997f } } };
 
         for (size_t index = 0; index < m_nimages; ++index)
         {